kern_thread.c revision 126326
1124350Sschweikh/* 299026Sjulian * Copyright (C) 2001 Julian Elischer <julian@freebsd.org>. 399026Sjulian * All rights reserved. 499026Sjulian * 599026Sjulian * Redistribution and use in source and binary forms, with or without 699026Sjulian * modification, are permitted provided that the following conditions 799026Sjulian * are met: 899026Sjulian * 1. Redistributions of source code must retain the above copyright 999026Sjulian * notice(s), this list of conditions and the following disclaimer as 10124350Sschweikh * the first lines of this file unmodified other than the possible 1199026Sjulian * addition of one or more copyright notices. 1299026Sjulian * 2. Redistributions in binary form must reproduce the above copyright 1399026Sjulian * notice(s), this list of conditions and the following disclaimer in the 1499026Sjulian * documentation and/or other materials provided with the distribution. 1599026Sjulian * 1699026Sjulian * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 1799026Sjulian * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 1899026Sjulian * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 1999026Sjulian * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY 2099026Sjulian * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 2199026Sjulian * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 2299026Sjulian * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 2399026Sjulian * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2499026Sjulian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2599026Sjulian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 2699026Sjulian * DAMAGE. 2799026Sjulian */ 2899026Sjulian 29116182Sobrien#include <sys/cdefs.h> 30116182Sobrien__FBSDID("$FreeBSD: head/sys/kern/kern_thread.c 126326 2004-02-27 18:52:44Z jhb $"); 31116182Sobrien 3299026Sjulian#include <sys/param.h> 3399026Sjulian#include <sys/systm.h> 3499026Sjulian#include <sys/kernel.h> 3599026Sjulian#include <sys/lock.h> 3699026Sjulian#include <sys/malloc.h> 3799026Sjulian#include <sys/mutex.h> 3899026Sjulian#include <sys/proc.h> 39107029Sjulian#include <sys/smp.h> 4099026Sjulian#include <sys/sysctl.h> 41105854Sjulian#include <sys/sysproto.h> 4299026Sjulian#include <sys/filedesc.h> 43107126Sjeff#include <sys/sched.h> 4499026Sjulian#include <sys/signalvar.h> 45126326Sjhb#include <sys/sleepqueue.h> 4699026Sjulian#include <sys/sx.h> 47107126Sjeff#include <sys/tty.h> 48122514Sjhb#include <sys/turnstile.h> 4999026Sjulian#include <sys/user.h> 5099026Sjulian#include <sys/kse.h> 5199026Sjulian#include <sys/ktr.h> 52103410Smini#include <sys/ucontext.h> 5399026Sjulian 5499026Sjulian#include <vm/vm.h> 55116355Salc#include <vm/vm_extern.h> 5699026Sjulian#include <vm/vm_object.h> 5799026Sjulian#include <vm/pmap.h> 5899026Sjulian#include <vm/uma.h> 5999026Sjulian#include <vm/vm_map.h> 6099026Sjulian 61100273Speter#include <machine/frame.h> 62100273Speter 6399026Sjulian/* 64103367Sjulian * KSEGRP related storage. 6599026Sjulian */ 66103367Sjulianstatic uma_zone_t ksegrp_zone; 67103367Sjulianstatic uma_zone_t kse_zone; 6899026Sjulianstatic uma_zone_t thread_zone; 69111028Sjeffstatic uma_zone_t upcall_zone; 7099026Sjulian 71103367Sjulian/* DEBUG ONLY */ 7299026SjulianSYSCTL_NODE(_kern, OID_AUTO, threads, CTLFLAG_RW, 0, "thread allocation"); 73107719Sjulianstatic int thread_debug = 0; 74107719SjulianSYSCTL_INT(_kern_threads, OID_AUTO, debug, CTLFLAG_RW, 75107719Sjulian &thread_debug, 0, "thread debug"); 7699026Sjulian 77114268Sdavidxustatic int max_threads_per_proc = 150; 78107006SdavidxuSYSCTL_INT(_kern_threads, OID_AUTO, max_threads_per_proc, CTLFLAG_RW, 79103367Sjulian &max_threads_per_proc, 0, "Limit on threads per proc"); 80103367Sjulian 81114268Sdavidxustatic int max_groups_per_proc = 50; 82107006SdavidxuSYSCTL_INT(_kern_threads, OID_AUTO, max_groups_per_proc, CTLFLAG_RW, 83107006Sdavidxu &max_groups_per_proc, 0, "Limit on thread groups per proc"); 84107006Sdavidxu 85111115Sdavidxustatic int max_threads_hits; 86111115SdavidxuSYSCTL_INT(_kern_threads, OID_AUTO, max_threads_hits, CTLFLAG_RD, 87111115Sdavidxu &max_threads_hits, 0, ""); 88111115Sdavidxu 89111028Sjeffstatic int virtual_cpu; 90111028Sjeff 9199026Sjulian#define RANGEOF(type, start, end) (offsetof(type, end) - offsetof(type, start)) 9299026Sjulian 93111028SjeffTAILQ_HEAD(, thread) zombie_threads = TAILQ_HEAD_INITIALIZER(zombie_threads); 94105854SjulianTAILQ_HEAD(, kse) zombie_kses = TAILQ_HEAD_INITIALIZER(zombie_kses); 95105854SjulianTAILQ_HEAD(, ksegrp) zombie_ksegrps = TAILQ_HEAD_INITIALIZER(zombie_ksegrps); 96124350SschweikhTAILQ_HEAD(, kse_upcall) zombie_upcalls = 97111028Sjeff TAILQ_HEAD_INITIALIZER(zombie_upcalls); 98111028Sjeffstruct mtx kse_zombie_lock; 99111028SjeffMTX_SYSINIT(kse_zombie_lock, &kse_zombie_lock, "kse zombie lock", MTX_SPIN); 10099026Sjulian 101107719Sjulianstatic void kse_purge(struct proc *p, struct thread *td); 102111028Sjeffstatic void kse_purge_group(struct thread *td); 103111515Sdavidxustatic int thread_update_usr_ticks(struct thread *td, int user); 104111028Sjeffstatic void thread_alloc_spare(struct thread *td, struct thread *spare); 105105854Sjulian 106111028Sjeffstatic int 107111028Sjeffsysctl_kse_virtual_cpu(SYSCTL_HANDLER_ARGS) 108111028Sjeff{ 109111028Sjeff int error, new_val; 110111028Sjeff int def_val; 111111028Sjeff 112111028Sjeff#ifdef SMP 113111028Sjeff def_val = mp_ncpus; 114111028Sjeff#else 115111028Sjeff def_val = 1; 116111028Sjeff#endif 117111028Sjeff if (virtual_cpu == 0) 118111028Sjeff new_val = def_val; 119111028Sjeff else 120111028Sjeff new_val = virtual_cpu; 121111028Sjeff error = sysctl_handle_int(oidp, &new_val, 0, req); 122111028Sjeff if (error != 0 || req->newptr == NULL) 123111028Sjeff return (error); 124111028Sjeff if (new_val < 0) 125111028Sjeff return (EINVAL); 126111028Sjeff virtual_cpu = new_val; 127111028Sjeff return (0); 128111028Sjeff} 129111028Sjeff 130111028Sjeff/* DEBUG ONLY */ 131111028SjeffSYSCTL_PROC(_kern_threads, OID_AUTO, virtual_cpu, CTLTYPE_INT|CTLFLAG_RW, 132111028Sjeff 0, sizeof(virtual_cpu), sysctl_kse_virtual_cpu, "I", 133111028Sjeff "debug virtual cpus"); 134111028Sjeff 13599026Sjulian/* 136107719Sjulian * Prepare a thread for use. 13799026Sjulian */ 13899026Sjulianstatic void 13999026Sjulianthread_ctor(void *mem, int size, void *arg) 14099026Sjulian{ 14199026Sjulian struct thread *td; 14299026Sjulian 14399026Sjulian td = (struct thread *)mem; 144103216Sjulian td->td_state = TDS_INACTIVE; 145113339Sjulian td->td_oncpu = NOCPU; 146118442Sjhb td->td_critnest = 1; 14799026Sjulian} 14899026Sjulian 14999026Sjulian/* 15099026Sjulian * Reclaim a thread after use. 15199026Sjulian */ 15299026Sjulianstatic void 15399026Sjulianthread_dtor(void *mem, int size, void *arg) 15499026Sjulian{ 15599026Sjulian struct thread *td; 15699026Sjulian 15799026Sjulian td = (struct thread *)mem; 15899026Sjulian 15999026Sjulian#ifdef INVARIANTS 16099026Sjulian /* Verify that this thread is in a safe state to free. */ 16199026Sjulian switch (td->td_state) { 162103216Sjulian case TDS_INHIBITED: 163103216Sjulian case TDS_RUNNING: 164103216Sjulian case TDS_CAN_RUN: 16599026Sjulian case TDS_RUNQ: 16699026Sjulian /* 16799026Sjulian * We must never unlink a thread that is in one of 16899026Sjulian * these states, because it is currently active. 16999026Sjulian */ 17099026Sjulian panic("bad state for thread unlinking"); 17199026Sjulian /* NOTREACHED */ 172103216Sjulian case TDS_INACTIVE: 17399026Sjulian break; 17499026Sjulian default: 17599026Sjulian panic("bad thread state"); 17699026Sjulian /* NOTREACHED */ 17799026Sjulian } 17899026Sjulian#endif 17999026Sjulian} 18099026Sjulian 18199026Sjulian/* 18299026Sjulian * Initialize type-stable parts of a thread (when newly created). 18399026Sjulian */ 18499026Sjulianstatic void 18599026Sjulianthread_init(void *mem, int size) 18699026Sjulian{ 18799026Sjulian struct thread *td; 18899026Sjulian 18999026Sjulian td = (struct thread *)mem; 190116355Salc vm_thread_new(td, 0); 19199026Sjulian cpu_thread_setup(td); 192126326Sjhb td->td_sleepqueue = sleepq_alloc(); 193122514Sjhb td->td_turnstile = turnstile_alloc(); 194107126Sjeff td->td_sched = (struct td_sched *)&td[1]; 19599026Sjulian} 19699026Sjulian 19799026Sjulian/* 19899026Sjulian * Tear down type-stable parts of a thread (just before being discarded). 19999026Sjulian */ 20099026Sjulianstatic void 20199026Sjulianthread_fini(void *mem, int size) 20299026Sjulian{ 20399026Sjulian struct thread *td; 20499026Sjulian 20599026Sjulian td = (struct thread *)mem; 206122514Sjhb turnstile_free(td->td_turnstile); 207126326Sjhb sleepq_free(td->td_sleepqueue); 208116355Salc vm_thread_dispose(td); 20999026Sjulian} 210111028Sjeff 211107126Sjeff/* 212107126Sjeff * Initialize type-stable parts of a kse (when newly created). 213107126Sjeff */ 214107126Sjeffstatic void 215107126Sjeffkse_init(void *mem, int size) 216107126Sjeff{ 217107126Sjeff struct kse *ke; 21899026Sjulian 219107126Sjeff ke = (struct kse *)mem; 220107126Sjeff ke->ke_sched = (struct ke_sched *)&ke[1]; 221107126Sjeff} 222111028Sjeff 223107126Sjeff/* 224107126Sjeff * Initialize type-stable parts of a ksegrp (when newly created). 225107126Sjeff */ 226107126Sjeffstatic void 227107126Sjeffksegrp_init(void *mem, int size) 228107126Sjeff{ 229107126Sjeff struct ksegrp *kg; 230107126Sjeff 231107126Sjeff kg = (struct ksegrp *)mem; 232107126Sjeff kg->kg_sched = (struct kg_sched *)&kg[1]; 233107126Sjeff} 234107126Sjeff 235124350Sschweikh/* 236111028Sjeff * KSE is linked into kse group. 237105854Sjulian */ 238105854Sjulianvoid 239105854Sjuliankse_link(struct kse *ke, struct ksegrp *kg) 240105854Sjulian{ 241105854Sjulian struct proc *p = kg->kg_proc; 242105854Sjulian 243105854Sjulian TAILQ_INSERT_HEAD(&kg->kg_kseq, ke, ke_kglist); 244105854Sjulian kg->kg_kses++; 245111028Sjeff ke->ke_state = KES_UNQUEUED; 246105854Sjulian ke->ke_proc = p; 247105854Sjulian ke->ke_ksegrp = kg; 248105854Sjulian ke->ke_thread = NULL; 249111028Sjeff ke->ke_oncpu = NOCPU; 250111028Sjeff ke->ke_flags = 0; 251105854Sjulian} 252105854Sjulian 253105854Sjulianvoid 254105854Sjuliankse_unlink(struct kse *ke) 255105854Sjulian{ 256105854Sjulian struct ksegrp *kg; 257105854Sjulian 258105854Sjulian mtx_assert(&sched_lock, MA_OWNED); 259105854Sjulian kg = ke->ke_ksegrp; 260105854Sjulian TAILQ_REMOVE(&kg->kg_kseq, ke, ke_kglist); 261111028Sjeff if (ke->ke_state == KES_IDLE) { 262111028Sjeff TAILQ_REMOVE(&kg->kg_iq, ke, ke_kgrlist); 263111028Sjeff kg->kg_idle_kses--; 264105854Sjulian } 265119488Sdavidxu --kg->kg_kses; 266105854Sjulian /* 267105854Sjulian * Aggregate stats from the KSE 268105854Sjulian */ 269105854Sjulian kse_stash(ke); 270105854Sjulian} 271105854Sjulian 272105854Sjulianvoid 273105854Sjulianksegrp_link(struct ksegrp *kg, struct proc *p) 274105854Sjulian{ 275105854Sjulian 276105854Sjulian TAILQ_INIT(&kg->kg_threads); 277105854Sjulian TAILQ_INIT(&kg->kg_runq); /* links with td_runq */ 278105854Sjulian TAILQ_INIT(&kg->kg_slpq); /* links with td_runq */ 279105854Sjulian TAILQ_INIT(&kg->kg_kseq); /* all kses in ksegrp */ 280111028Sjeff TAILQ_INIT(&kg->kg_iq); /* all idle kses in ksegrp */ 281111028Sjeff TAILQ_INIT(&kg->kg_upcalls); /* all upcall structure in ksegrp */ 282111028Sjeff kg->kg_proc = p; 283111028Sjeff /* 284111028Sjeff * the following counters are in the -zero- section 285111028Sjeff * and may not need clearing 286111028Sjeff */ 287105854Sjulian kg->kg_numthreads = 0; 288111028Sjeff kg->kg_runnable = 0; 289111028Sjeff kg->kg_kses = 0; 290111028Sjeff kg->kg_runq_kses = 0; /* XXXKSE change name */ 291111028Sjeff kg->kg_idle_kses = 0; 292111028Sjeff kg->kg_numupcalls = 0; 293111028Sjeff /* link it in now that it's consistent */ 294105854Sjulian p->p_numksegrps++; 295105854Sjulian TAILQ_INSERT_HEAD(&p->p_ksegrps, kg, kg_ksegrp); 296105854Sjulian} 297105854Sjulian 298105854Sjulianvoid 299105854Sjulianksegrp_unlink(struct ksegrp *kg) 300105854Sjulian{ 301105854Sjulian struct proc *p; 302105854Sjulian 303105854Sjulian mtx_assert(&sched_lock, MA_OWNED); 304111028Sjeff KASSERT((kg->kg_numthreads == 0), ("ksegrp_unlink: residual threads")); 305111028Sjeff KASSERT((kg->kg_kses == 0), ("ksegrp_unlink: residual kses")); 306111028Sjeff KASSERT((kg->kg_numupcalls == 0), ("ksegrp_unlink: residual upcalls")); 307111028Sjeff 308105854Sjulian p = kg->kg_proc; 309105854Sjulian TAILQ_REMOVE(&p->p_ksegrps, kg, kg_ksegrp); 310105854Sjulian p->p_numksegrps--; 311105854Sjulian /* 312105854Sjulian * Aggregate stats from the KSE 313105854Sjulian */ 314105854Sjulian ksegrp_stash(kg); 315105854Sjulian} 316105854Sjulian 317111028Sjeffstruct kse_upcall * 318111028Sjeffupcall_alloc(void) 319111028Sjeff{ 320111028Sjeff struct kse_upcall *ku; 321111028Sjeff 322111125Sdavidxu ku = uma_zalloc(upcall_zone, M_WAITOK); 323111028Sjeff bzero(ku, sizeof(*ku)); 324111028Sjeff return (ku); 325111028Sjeff} 326111028Sjeff 327111028Sjeffvoid 328111028Sjeffupcall_free(struct kse_upcall *ku) 329111028Sjeff{ 330111028Sjeff 331111028Sjeff uma_zfree(upcall_zone, ku); 332111028Sjeff} 333111028Sjeff 334111028Sjeffvoid 335111028Sjeffupcall_link(struct kse_upcall *ku, struct ksegrp *kg) 336111028Sjeff{ 337111028Sjeff 338111028Sjeff mtx_assert(&sched_lock, MA_OWNED); 339111028Sjeff TAILQ_INSERT_TAIL(&kg->kg_upcalls, ku, ku_link); 340111028Sjeff ku->ku_ksegrp = kg; 341111028Sjeff kg->kg_numupcalls++; 342111028Sjeff} 343111028Sjeff 344111028Sjeffvoid 345111028Sjeffupcall_unlink(struct kse_upcall *ku) 346111028Sjeff{ 347111028Sjeff struct ksegrp *kg = ku->ku_ksegrp; 348111028Sjeff 349111028Sjeff mtx_assert(&sched_lock, MA_OWNED); 350111028Sjeff KASSERT(ku->ku_owner == NULL, ("%s: have owner", __func__)); 351124350Sschweikh TAILQ_REMOVE(&kg->kg_upcalls, ku, ku_link); 352111028Sjeff kg->kg_numupcalls--; 353111028Sjeff upcall_stash(ku); 354111028Sjeff} 355111028Sjeff 356111028Sjeffvoid 357111028Sjeffupcall_remove(struct thread *td) 358111028Sjeff{ 359111028Sjeff 360111028Sjeff if (td->td_upcall) { 361111028Sjeff td->td_upcall->ku_owner = NULL; 362111028Sjeff upcall_unlink(td->td_upcall); 363111028Sjeff td->td_upcall = 0; 364124350Sschweikh } 365111028Sjeff} 366111028Sjeff 36799026Sjulian/* 368111028Sjeff * For a newly created process, 369111028Sjeff * link up all the structures and its initial threads etc. 370105854Sjulian */ 371105854Sjulianvoid 372105854Sjulianproc_linkup(struct proc *p, struct ksegrp *kg, 373111028Sjeff struct kse *ke, struct thread *td) 374105854Sjulian{ 375105854Sjulian 376105854Sjulian TAILQ_INIT(&p->p_ksegrps); /* all ksegrps in proc */ 377105854Sjulian TAILQ_INIT(&p->p_threads); /* all threads in proc */ 378105854Sjulian TAILQ_INIT(&p->p_suspended); /* Threads suspended */ 379105854Sjulian p->p_numksegrps = 0; 380105854Sjulian p->p_numthreads = 0; 381105854Sjulian 382105854Sjulian ksegrp_link(kg, p); 383105854Sjulian kse_link(ke, kg); 384105854Sjulian thread_link(td, kg); 385105854Sjulian} 386105854Sjulian 387123252Smarcel#ifndef _SYS_SYSPROTO_H_ 388123252Smarcelstruct kse_switchin_args { 389123252Smarcel const struct __mcontext *mcp; 390123252Smarcel long val; 391123252Smarcel long *loc; 392123252Smarcel}; 393123252Smarcel#endif 394123252Smarcel 395123252Smarcelint 396123252Smarcelkse_switchin(struct thread *td, struct kse_switchin_args *uap) 397123252Smarcel{ 398123252Smarcel mcontext_t mc; 399123252Smarcel int error; 400123252Smarcel 401123252Smarcel error = (uap->mcp == NULL) ? EINVAL : 0; 402123252Smarcel if (!error) 403123252Smarcel error = copyin(uap->mcp, &mc, sizeof(mc)); 404123366Smarcel if (!error && uap->loc != NULL) 405123366Smarcel error = (suword(uap->loc, uap->val) != 0) ? EINVAL : 0; 406123252Smarcel if (!error) 407123252Smarcel error = set_mcontext(td, &mc); 408123252Smarcel return ((error == 0) ? EJUSTRETURN : error); 409123252Smarcel} 410123252Smarcel 411111028Sjeff/* 412111028Sjeffstruct kse_thr_interrupt_args { 413111028Sjeff struct kse_thr_mailbox * tmbx; 414117704Sdavidxu int cmd; 415117704Sdavidxu long data; 416111028Sjeff}; 417111028Sjeff*/ 418105854Sjulianint 419105854Sjuliankse_thr_interrupt(struct thread *td, struct kse_thr_interrupt_args *uap) 420105854Sjulian{ 421106180Sdavidxu struct proc *p; 422106180Sdavidxu struct thread *td2; 423105854Sjulian 424106242Sdavidxu p = td->td_proc; 425119488Sdavidxu 426117704Sdavidxu if (!(p->p_flag & P_SA)) 427106242Sdavidxu return (EINVAL); 428116963Sdavidxu 429117704Sdavidxu switch (uap->cmd) { 430117704Sdavidxu case KSE_INTR_SENDSIG: 431117704Sdavidxu if (uap->data < 0 || uap->data > _SIG_MAXSIG) 432117704Sdavidxu return (EINVAL); 433117704Sdavidxu case KSE_INTR_INTERRUPT: 434117704Sdavidxu case KSE_INTR_RESTART: 435117704Sdavidxu PROC_LOCK(p); 436117704Sdavidxu mtx_lock_spin(&sched_lock); 437117704Sdavidxu FOREACH_THREAD_IN_PROC(p, td2) { 438117704Sdavidxu if (td2->td_mailbox == uap->tmbx) 439117704Sdavidxu break; 440117704Sdavidxu } 441117704Sdavidxu if (td2 == NULL) { 442117704Sdavidxu mtx_unlock_spin(&sched_lock); 443117704Sdavidxu PROC_UNLOCK(p); 444117704Sdavidxu return (ESRCH); 445117704Sdavidxu } 446117704Sdavidxu if (uap->cmd == KSE_INTR_SENDSIG) { 447117704Sdavidxu if (uap->data > 0) { 448117704Sdavidxu td2->td_flags &= ~TDF_INTERRUPT; 449117704Sdavidxu mtx_unlock_spin(&sched_lock); 450117704Sdavidxu tdsignal(td2, (int)uap->data, SIGTARGET_TD); 451117704Sdavidxu } else { 452117704Sdavidxu mtx_unlock_spin(&sched_lock); 453117704Sdavidxu } 454117704Sdavidxu } else { 455117704Sdavidxu td2->td_flags |= TDF_INTERRUPT | TDF_ASTPENDING; 456117704Sdavidxu if (TD_CAN_UNBIND(td2)) 457117704Sdavidxu td2->td_upcall->ku_flags |= KUF_DOUPCALL; 458117704Sdavidxu if (uap->cmd == KSE_INTR_INTERRUPT) 459117704Sdavidxu td2->td_intrval = EINTR; 460116963Sdavidxu else 461117704Sdavidxu td2->td_intrval = ERESTART; 462126326Sjhb if (TD_ON_SLEEPQ(td2) && (td2->td_flags & TDF_SINTR)) 463126326Sjhb sleepq_abort(td2); 464117704Sdavidxu mtx_unlock_spin(&sched_lock); 465106180Sdavidxu } 466117704Sdavidxu PROC_UNLOCK(p); 467117704Sdavidxu break; 468117704Sdavidxu case KSE_INTR_SIGEXIT: 469117704Sdavidxu if (uap->data < 1 || uap->data > _SIG_MAXSIG) 470117704Sdavidxu return (EINVAL); 471117704Sdavidxu PROC_LOCK(p); 472117704Sdavidxu sigexit(td, (int)uap->data); 473117704Sdavidxu break; 474117704Sdavidxu default: 475117704Sdavidxu return (EINVAL); 476106180Sdavidxu } 477116963Sdavidxu return (0); 478105854Sjulian} 479105854Sjulian 480111028Sjeff/* 481111028Sjeffstruct kse_exit_args { 482111028Sjeff register_t dummy; 483111028Sjeff}; 484111028Sjeff*/ 485105854Sjulianint 486105854Sjuliankse_exit(struct thread *td, struct kse_exit_args *uap) 487105854Sjulian{ 488105854Sjulian struct proc *p; 489105854Sjulian struct ksegrp *kg; 490108640Sdavidxu struct kse *ke; 491115790Sjulian struct kse_upcall *ku, *ku2; 492115790Sjulian int error, count; 493105854Sjulian 494105854Sjulian p = td->td_proc; 495115790Sjulian if ((ku = td->td_upcall) == NULL || TD_CAN_UNBIND(td)) 496106182Sdavidxu return (EINVAL); 497105854Sjulian kg = td->td_ksegrp; 498115790Sjulian count = 0; 499105854Sjulian PROC_LOCK(p); 500105854Sjulian mtx_lock_spin(&sched_lock); 501115790Sjulian FOREACH_UPCALL_IN_GROUP(kg, ku2) { 502115790Sjulian if (ku2->ku_flags & KUF_EXITING) 503115790Sjulian count++; 504115790Sjulian } 505115790Sjulian if ((kg->kg_numupcalls - count) == 1 && 506115790Sjulian (kg->kg_numthreads > 1)) { 507105854Sjulian mtx_unlock_spin(&sched_lock); 508105854Sjulian PROC_UNLOCK(p); 509105854Sjulian return (EDEADLK); 510105854Sjulian } 511115790Sjulian ku->ku_flags |= KUF_EXITING; 512115790Sjulian mtx_unlock_spin(&sched_lock); 513115790Sjulian PROC_UNLOCK(p); 514115790Sjulian error = suword(&ku->ku_mailbox->km_flags, ku->ku_mflags|KMF_DONE); 515115790Sjulian PROC_LOCK(p); 516115790Sjulian if (error) 517115790Sjulian psignal(p, SIGSEGV); 518115790Sjulian mtx_lock_spin(&sched_lock); 519115790Sjulian upcall_remove(td); 520108640Sdavidxu ke = td->td_kse; 521108640Sdavidxu if (p->p_numthreads == 1) { 522111028Sjeff kse_purge(p, td); 523116361Sdavidxu p->p_flag &= ~P_SA; 524105854Sjulian mtx_unlock_spin(&sched_lock); 525105854Sjulian PROC_UNLOCK(p); 526105854Sjulian } else { 527111028Sjeff if (kg->kg_numthreads == 1) { /* Shutdown a group */ 528111028Sjeff kse_purge_group(td); 529111028Sjeff ke->ke_flags |= KEF_EXIT; 530111028Sjeff } 531112071Sdavidxu thread_stopped(p); 532105854Sjulian thread_exit(); 533105854Sjulian /* NOTREACHED */ 534105854Sjulian } 535106182Sdavidxu return (0); 536105854Sjulian} 537105854Sjulian 538107719Sjulian/* 539108338Sjulian * Either becomes an upcall or waits for an awakening event and 540111028Sjeff * then becomes an upcall. Only error cases return. 541107719Sjulian */ 542111028Sjeff/* 543111028Sjeffstruct kse_release_args { 544111169Sdavidxu struct timespec *timeout; 545111028Sjeff}; 546111028Sjeff*/ 547105854Sjulianint 548111028Sjeffkse_release(struct thread *td, struct kse_release_args *uap) 549105854Sjulian{ 550105854Sjulian struct proc *p; 551107719Sjulian struct ksegrp *kg; 552116401Sdavidxu struct kse_upcall *ku; 553116401Sdavidxu struct timespec timeout; 554111169Sdavidxu struct timeval tv; 555116963Sdavidxu sigset_t sigset; 556111169Sdavidxu int error; 557105854Sjulian 558105854Sjulian p = td->td_proc; 559107719Sjulian kg = td->td_ksegrp; 560116401Sdavidxu if ((ku = td->td_upcall) == NULL || TD_CAN_UNBIND(td)) 561107719Sjulian return (EINVAL); 562111169Sdavidxu if (uap->timeout != NULL) { 563111169Sdavidxu if ((error = copyin(uap->timeout, &timeout, sizeof(timeout)))) 564111169Sdavidxu return (error); 565111169Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &timeout); 566111169Sdavidxu } 567116401Sdavidxu if (td->td_flags & TDF_SA) 568116401Sdavidxu td->td_pflags |= TDP_UPCALLING; 569116963Sdavidxu else { 570116963Sdavidxu ku->ku_mflags = fuword(&ku->ku_mailbox->km_flags); 571116963Sdavidxu if (ku->ku_mflags == -1) { 572116963Sdavidxu PROC_LOCK(p); 573116963Sdavidxu sigexit(td, SIGSEGV); 574116963Sdavidxu } 575116963Sdavidxu } 576111169Sdavidxu PROC_LOCK(p); 577116963Sdavidxu if (ku->ku_mflags & KMF_WAITSIGEVENT) { 578116963Sdavidxu /* UTS wants to wait for signal event */ 579116963Sdavidxu if (!(p->p_flag & P_SIGEVENT) && !(ku->ku_flags & KUF_DOUPCALL)) 580116963Sdavidxu error = msleep(&p->p_siglist, &p->p_mtx, PPAUSE|PCATCH, 581116963Sdavidxu "ksesigwait", (uap->timeout ? tvtohz(&tv) : 0)); 582116963Sdavidxu p->p_flag &= ~P_SIGEVENT; 583116963Sdavidxu sigset = p->p_siglist; 584116963Sdavidxu PROC_UNLOCK(p); 585116963Sdavidxu error = copyout(&sigset, &ku->ku_mailbox->km_sigscaught, 586116963Sdavidxu sizeof(sigset)); 587116963Sdavidxu } else { 588116963Sdavidxu if (! kg->kg_completed && !(ku->ku_flags & KUF_DOUPCALL)) { 589116963Sdavidxu kg->kg_upsleeps++; 590116963Sdavidxu error = msleep(&kg->kg_completed, &p->p_mtx, 591116963Sdavidxu PPAUSE|PCATCH, "kserel", 592116963Sdavidxu (uap->timeout ? tvtohz(&tv) : 0)); 593116963Sdavidxu kg->kg_upsleeps--; 594116963Sdavidxu } 595116963Sdavidxu PROC_UNLOCK(p); 596105854Sjulian } 597116401Sdavidxu if (ku->ku_flags & KUF_DOUPCALL) { 598116401Sdavidxu mtx_lock_spin(&sched_lock); 599116401Sdavidxu ku->ku_flags &= ~KUF_DOUPCALL; 600116401Sdavidxu mtx_unlock_spin(&sched_lock); 601116401Sdavidxu } 602107719Sjulian return (0); 603105854Sjulian} 604105854Sjulian 605105854Sjulian/* struct kse_wakeup_args { 606105854Sjulian struct kse_mailbox *mbx; 607105854Sjulian}; */ 608105854Sjulianint 609105854Sjuliankse_wakeup(struct thread *td, struct kse_wakeup_args *uap) 610105854Sjulian{ 611105854Sjulian struct proc *p; 612105854Sjulian struct ksegrp *kg; 613111028Sjeff struct kse_upcall *ku; 614108338Sjulian struct thread *td2; 615105854Sjulian 616105854Sjulian p = td->td_proc; 617108338Sjulian td2 = NULL; 618111028Sjeff ku = NULL; 619105854Sjulian /* KSE-enabled processes only, please. */ 620116361Sdavidxu if (!(p->p_flag & P_SA)) 621111028Sjeff return (EINVAL); 622111028Sjeff PROC_LOCK(p); 623108613Sjulian mtx_lock_spin(&sched_lock); 624105854Sjulian if (uap->mbx) { 625105854Sjulian FOREACH_KSEGRP_IN_PROC(p, kg) { 626111028Sjeff FOREACH_UPCALL_IN_GROUP(kg, ku) { 627111207Sdavidxu if (ku->ku_mailbox == uap->mbx) 628111028Sjeff break; 629108613Sjulian } 630111028Sjeff if (ku) 631108338Sjulian break; 632105854Sjulian } 633105854Sjulian } else { 634105854Sjulian kg = td->td_ksegrp; 635111028Sjeff if (kg->kg_upsleeps) { 636111028Sjeff wakeup_one(&kg->kg_completed); 637111028Sjeff mtx_unlock_spin(&sched_lock); 638111028Sjeff PROC_UNLOCK(p); 639111028Sjeff return (0); 640108338Sjulian } 641111028Sjeff ku = TAILQ_FIRST(&kg->kg_upcalls); 642105854Sjulian } 643111028Sjeff if (ku) { 644111028Sjeff if ((td2 = ku->ku_owner) == NULL) { 645111028Sjeff panic("%s: no owner", __func__); 646111028Sjeff } else if (TD_ON_SLEEPQ(td2) && 647116963Sdavidxu ((td2->td_wchan == &kg->kg_completed) || 648116963Sdavidxu (td2->td_wchan == &p->p_siglist && 649116963Sdavidxu (ku->ku_mflags & KMF_WAITSIGEVENT)))) { 650126326Sjhb sleepq_abort(td2); 651111028Sjeff } else { 652111028Sjeff ku->ku_flags |= KUF_DOUPCALL; 653108613Sjulian } 654105854Sjulian mtx_unlock_spin(&sched_lock); 655111028Sjeff PROC_UNLOCK(p); 656108338Sjulian return (0); 657108613Sjulian } 658105854Sjulian mtx_unlock_spin(&sched_lock); 659111028Sjeff PROC_UNLOCK(p); 660108338Sjulian return (ESRCH); 661105854Sjulian} 662105854Sjulian 663124350Sschweikh/* 664105854Sjulian * No new KSEG: first call: use current KSE, don't schedule an upcall 665111028Sjeff * All other situations, do allocate max new KSEs and schedule an upcall. 666105854Sjulian */ 667105854Sjulian/* struct kse_create_args { 668105854Sjulian struct kse_mailbox *mbx; 669105854Sjulian int newgroup; 670105854Sjulian}; */ 671105854Sjulianint 672105854Sjuliankse_create(struct thread *td, struct kse_create_args *uap) 673105854Sjulian{ 674105854Sjulian struct kse *newke; 675105854Sjulian struct ksegrp *newkg; 676105854Sjulian struct ksegrp *kg; 677105854Sjulian struct proc *p; 678105854Sjulian struct kse_mailbox mbx; 679111028Sjeff struct kse_upcall *newku; 680116401Sdavidxu int err, ncpus, sa = 0, first = 0; 681116401Sdavidxu struct thread *newtd; 682105854Sjulian 683105854Sjulian p = td->td_proc; 684105854Sjulian if ((err = copyin(uap->mbx, &mbx, sizeof(mbx)))) 685105854Sjulian return (err); 686105854Sjulian 687111028Sjeff /* Too bad, why hasn't kernel always a cpu counter !? */ 688111028Sjeff#ifdef SMP 689111028Sjeff ncpus = mp_ncpus; 690111028Sjeff#else 691111028Sjeff ncpus = 1; 692111028Sjeff#endif 693116401Sdavidxu if (virtual_cpu != 0) 694111028Sjeff ncpus = virtual_cpu; 695116401Sdavidxu if (!(mbx.km_flags & KMF_BOUND)) 696116401Sdavidxu sa = TDF_SA; 697116440Sdavidxu else 698116440Sdavidxu ncpus = 1; 699112078Sdavidxu PROC_LOCK(p); 700116401Sdavidxu if (!(p->p_flag & P_SA)) { 701116401Sdavidxu first = 1; 702116401Sdavidxu p->p_flag |= P_SA; 703116401Sdavidxu } 704112078Sdavidxu PROC_UNLOCK(p); 705116401Sdavidxu if (!sa && !uap->newgroup && !first) 706116401Sdavidxu return (EINVAL); 707105854Sjulian kg = td->td_ksegrp; 708105854Sjulian if (uap->newgroup) { 709124350Sschweikh /* Have race condition but it is cheap */ 710116401Sdavidxu if (p->p_numksegrps >= max_groups_per_proc) 711107006Sdavidxu return (EPROCLIM); 712124350Sschweikh /* 713105854Sjulian * If we want a new KSEGRP it doesn't matter whether 714105854Sjulian * we have already fired up KSE mode before or not. 715111028Sjeff * We put the process in KSE mode and create a new KSEGRP. 716105854Sjulian */ 717105854Sjulian newkg = ksegrp_alloc(); 718105854Sjulian bzero(&newkg->kg_startzero, RANGEOF(struct ksegrp, 719111028Sjeff kg_startzero, kg_endzero)); 720105854Sjulian bcopy(&kg->kg_startcopy, &newkg->kg_startcopy, 721105854Sjulian RANGEOF(struct ksegrp, kg_startcopy, kg_endcopy)); 722124350Sschweikh PROC_LOCK(p); 723111028Sjeff mtx_lock_spin(&sched_lock); 724111028Sjeff if (p->p_numksegrps >= max_groups_per_proc) { 725111028Sjeff mtx_unlock_spin(&sched_lock); 726119488Sdavidxu PROC_UNLOCK(p); 727111677Sdavidxu ksegrp_free(newkg); 728111028Sjeff return (EPROCLIM); 729111028Sjeff } 730111677Sdavidxu ksegrp_link(newkg, p); 731119488Sdavidxu sched_fork_ksegrp(kg, newkg); 732111028Sjeff mtx_unlock_spin(&sched_lock); 733119488Sdavidxu PROC_UNLOCK(p); 734105854Sjulian } else { 735116452Sdavidxu if (!first && ((td->td_flags & TDF_SA) ^ sa) != 0) 736116452Sdavidxu return (EINVAL); 737111028Sjeff newkg = kg; 738111028Sjeff } 739111028Sjeff 740111028Sjeff /* 741111028Sjeff * Creating upcalls more than number of physical cpu does 742124350Sschweikh * not help performance. 743111028Sjeff */ 744111028Sjeff if (newkg->kg_numupcalls >= ncpus) 745111028Sjeff return (EPROCLIM); 746111028Sjeff 747111028Sjeff if (newkg->kg_numupcalls == 0) { 748111028Sjeff /* 749116401Sdavidxu * Initialize KSE group 750116401Sdavidxu * 751116401Sdavidxu * For multiplxed group, create KSEs as many as physical 752116401Sdavidxu * cpus. This increases concurrent even if userland 753116401Sdavidxu * is not MP safe and can only run on single CPU. 754111028Sjeff * In ideal world, every physical cpu should execute a thread. 755111028Sjeff * If there is enough KSEs, threads in kernel can be 756124350Sschweikh * executed parallel on different cpus with full speed, 757124350Sschweikh * Concurrent in kernel shouldn't be restricted by number of 758116401Sdavidxu * upcalls userland provides. Adding more upcall structures 759116401Sdavidxu * only increases concurrent in userland. 760116401Sdavidxu * 761116401Sdavidxu * For bound thread group, because there is only thread in the 762116401Sdavidxu * group, we only create one KSE for the group. Thread in this 763116401Sdavidxu * kind of group will never schedule an upcall when blocked, 764116401Sdavidxu * this intends to simulate pthread system scope thread. 765105854Sjulian */ 766111028Sjeff while (newkg->kg_kses < ncpus) { 767105854Sjulian newke = kse_alloc(); 768111028Sjeff bzero(&newke->ke_startzero, RANGEOF(struct kse, 769111028Sjeff ke_startzero, ke_endzero)); 770105854Sjulian#if 0 771111028Sjeff mtx_lock_spin(&sched_lock); 772111028Sjeff bcopy(&ke->ke_startcopy, &newke->ke_startcopy, 773111028Sjeff RANGEOF(struct kse, ke_startcopy, ke_endcopy)); 774111028Sjeff mtx_unlock_spin(&sched_lock); 775105854Sjulian#endif 776111028Sjeff mtx_lock_spin(&sched_lock); 777111028Sjeff kse_link(newke, newkg); 778119488Sdavidxu sched_fork_kse(td->td_kse, newke); 779111028Sjeff /* Add engine */ 780111028Sjeff kse_reassign(newke); 781111028Sjeff mtx_unlock_spin(&sched_lock); 782105854Sjulian } 783111028Sjeff } 784111028Sjeff newku = upcall_alloc(); 785111028Sjeff newku->ku_mailbox = uap->mbx; 786111028Sjeff newku->ku_func = mbx.km_func; 787111028Sjeff bcopy(&mbx.km_stack, &newku->ku_stack, sizeof(stack_t)); 788111028Sjeff 789111028Sjeff /* For the first call this may not have been set */ 790111028Sjeff if (td->td_standin == NULL) 791111028Sjeff thread_alloc_spare(td, NULL); 792111028Sjeff 793116963Sdavidxu PROC_LOCK(p); 794111028Sjeff if (newkg->kg_numupcalls >= ncpus) { 795116963Sdavidxu PROC_UNLOCK(p); 796111028Sjeff upcall_free(newku); 797111028Sjeff return (EPROCLIM); 798111028Sjeff } 799117637Sdavidxu if (first && sa) { 800116963Sdavidxu SIGSETOR(p->p_siglist, td->td_siglist); 801116963Sdavidxu SIGEMPTYSET(td->td_siglist); 802116963Sdavidxu SIGFILLSET(td->td_sigmask); 803116963Sdavidxu SIG_CANTMASK(td->td_sigmask); 804116963Sdavidxu } 805116963Sdavidxu mtx_lock_spin(&sched_lock); 806116963Sdavidxu PROC_UNLOCK(p); 807111028Sjeff upcall_link(newku, newkg); 808112397Sdavidxu if (mbx.km_quantum) 809112397Sdavidxu newkg->kg_upquantum = max(1, mbx.km_quantum/tick); 810111028Sjeff 811111028Sjeff /* 812111028Sjeff * Each upcall structure has an owner thread, find which 813111028Sjeff * one owns it. 814111028Sjeff */ 815111028Sjeff if (uap->newgroup) { 816124350Sschweikh /* 817111028Sjeff * Because new ksegrp hasn't thread, 818111028Sjeff * create an initial upcall thread to own it. 819111028Sjeff */ 820116401Sdavidxu newtd = thread_schedule_upcall(td, newku); 821105854Sjulian } else { 822105854Sjulian /* 823111028Sjeff * If current thread hasn't an upcall structure, 824111028Sjeff * just assign the upcall to it. 825105854Sjulian */ 826111028Sjeff if (td->td_upcall == NULL) { 827111028Sjeff newku->ku_owner = td; 828111028Sjeff td->td_upcall = newku; 829116401Sdavidxu newtd = td; 830111028Sjeff } else { 831111028Sjeff /* 832111028Sjeff * Create a new upcall thread to own it. 833111028Sjeff */ 834116401Sdavidxu newtd = thread_schedule_upcall(td, newku); 835111028Sjeff } 836105854Sjulian } 837116401Sdavidxu if (!sa) { 838116401Sdavidxu newtd->td_mailbox = mbx.km_curthread; 839116401Sdavidxu newtd->td_flags &= ~TDF_SA; 840116607Sdavidxu if (newtd != td) { 841116607Sdavidxu mtx_unlock_spin(&sched_lock); 842116607Sdavidxu cpu_set_upcall_kse(newtd, newku); 843116607Sdavidxu mtx_lock_spin(&sched_lock); 844116607Sdavidxu } 845116401Sdavidxu } else { 846116401Sdavidxu newtd->td_flags |= TDF_SA; 847116401Sdavidxu } 848116607Sdavidxu if (newtd != td) 849116607Sdavidxu setrunqueue(newtd); 850111028Sjeff mtx_unlock_spin(&sched_lock); 851105854Sjulian return (0); 852105854Sjulian} 853105854Sjulian 854105854Sjulian/* 85599026Sjulian * Initialize global thread allocation resources. 85699026Sjulian */ 85799026Sjulianvoid 85899026Sjulianthreadinit(void) 85999026Sjulian{ 86099026Sjulian 861107126Sjeff thread_zone = uma_zcreate("THREAD", sched_sizeof_thread(), 86299026Sjulian thread_ctor, thread_dtor, thread_init, thread_fini, 86399026Sjulian UMA_ALIGN_CACHE, 0); 864107126Sjeff ksegrp_zone = uma_zcreate("KSEGRP", sched_sizeof_ksegrp(), 865107126Sjeff NULL, NULL, ksegrp_init, NULL, 866103367Sjulian UMA_ALIGN_CACHE, 0); 867107126Sjeff kse_zone = uma_zcreate("KSE", sched_sizeof_kse(), 868107126Sjeff NULL, NULL, kse_init, NULL, 869103367Sjulian UMA_ALIGN_CACHE, 0); 870111028Sjeff upcall_zone = uma_zcreate("UPCALL", sizeof(struct kse_upcall), 871111028Sjeff NULL, NULL, NULL, NULL, UMA_ALIGN_CACHE, 0); 87299026Sjulian} 87399026Sjulian 87499026Sjulian/* 875103002Sjulian * Stash an embarasingly extra thread into the zombie thread queue. 87699026Sjulian */ 87799026Sjulianvoid 87899026Sjulianthread_stash(struct thread *td) 87999026Sjulian{ 880111028Sjeff mtx_lock_spin(&kse_zombie_lock); 88199026Sjulian TAILQ_INSERT_HEAD(&zombie_threads, td, td_runq); 882111028Sjeff mtx_unlock_spin(&kse_zombie_lock); 88399026Sjulian} 88499026Sjulian 885103410Smini/* 886105854Sjulian * Stash an embarasingly extra kse into the zombie kse queue. 887105854Sjulian */ 888105854Sjulianvoid 889105854Sjuliankse_stash(struct kse *ke) 890105854Sjulian{ 891111028Sjeff mtx_lock_spin(&kse_zombie_lock); 892105854Sjulian TAILQ_INSERT_HEAD(&zombie_kses, ke, ke_procq); 893111028Sjeff mtx_unlock_spin(&kse_zombie_lock); 894105854Sjulian} 895105854Sjulian 896105854Sjulian/* 897111028Sjeff * Stash an embarasingly extra upcall into the zombie upcall queue. 898111028Sjeff */ 899111028Sjeff 900111028Sjeffvoid 901111028Sjeffupcall_stash(struct kse_upcall *ku) 902111028Sjeff{ 903111028Sjeff mtx_lock_spin(&kse_zombie_lock); 904111028Sjeff TAILQ_INSERT_HEAD(&zombie_upcalls, ku, ku_link); 905111028Sjeff mtx_unlock_spin(&kse_zombie_lock); 906111028Sjeff} 907111028Sjeff 908111028Sjeff/* 909105854Sjulian * Stash an embarasingly extra ksegrp into the zombie ksegrp queue. 910105854Sjulian */ 911105854Sjulianvoid 912105854Sjulianksegrp_stash(struct ksegrp *kg) 913105854Sjulian{ 914111028Sjeff mtx_lock_spin(&kse_zombie_lock); 915105854Sjulian TAILQ_INSERT_HEAD(&zombie_ksegrps, kg, kg_ksegrp); 916111028Sjeff mtx_unlock_spin(&kse_zombie_lock); 917105854Sjulian} 918105854Sjulian 919105854Sjulian/* 920111028Sjeff * Reap zombie kse resource. 92199026Sjulian */ 92299026Sjulianvoid 92399026Sjulianthread_reap(void) 92499026Sjulian{ 925105854Sjulian struct thread *td_first, *td_next; 926105854Sjulian struct kse *ke_first, *ke_next; 927105854Sjulian struct ksegrp *kg_first, * kg_next; 928111028Sjeff struct kse_upcall *ku_first, *ku_next; 92999026Sjulian 93099026Sjulian /* 931111028Sjeff * Don't even bother to lock if none at this instant, 932111028Sjeff * we really don't care about the next instant.. 93399026Sjulian */ 934105854Sjulian if ((!TAILQ_EMPTY(&zombie_threads)) 935105854Sjulian || (!TAILQ_EMPTY(&zombie_kses)) 936111028Sjeff || (!TAILQ_EMPTY(&zombie_ksegrps)) 937111028Sjeff || (!TAILQ_EMPTY(&zombie_upcalls))) { 938111028Sjeff mtx_lock_spin(&kse_zombie_lock); 939105854Sjulian td_first = TAILQ_FIRST(&zombie_threads); 940105854Sjulian ke_first = TAILQ_FIRST(&zombie_kses); 941105854Sjulian kg_first = TAILQ_FIRST(&zombie_ksegrps); 942111028Sjeff ku_first = TAILQ_FIRST(&zombie_upcalls); 943105854Sjulian if (td_first) 944105854Sjulian TAILQ_INIT(&zombie_threads); 945105854Sjulian if (ke_first) 946105854Sjulian TAILQ_INIT(&zombie_kses); 947105854Sjulian if (kg_first) 948105854Sjulian TAILQ_INIT(&zombie_ksegrps); 949111028Sjeff if (ku_first) 950111028Sjeff TAILQ_INIT(&zombie_upcalls); 951111028Sjeff mtx_unlock_spin(&kse_zombie_lock); 952105854Sjulian while (td_first) { 953105854Sjulian td_next = TAILQ_NEXT(td_first, td_runq); 954111028Sjeff if (td_first->td_ucred) 955111028Sjeff crfree(td_first->td_ucred); 956105854Sjulian thread_free(td_first); 957105854Sjulian td_first = td_next; 95899026Sjulian } 959105854Sjulian while (ke_first) { 960105854Sjulian ke_next = TAILQ_NEXT(ke_first, ke_procq); 961105854Sjulian kse_free(ke_first); 962105854Sjulian ke_first = ke_next; 963105854Sjulian } 964105854Sjulian while (kg_first) { 965105854Sjulian kg_next = TAILQ_NEXT(kg_first, kg_ksegrp); 966105854Sjulian ksegrp_free(kg_first); 967105854Sjulian kg_first = kg_next; 968105854Sjulian } 969111028Sjeff while (ku_first) { 970111028Sjeff ku_next = TAILQ_NEXT(ku_first, ku_link); 971111028Sjeff upcall_free(ku_first); 972111028Sjeff ku_first = ku_next; 973111028Sjeff } 97499026Sjulian } 97599026Sjulian} 97699026Sjulian 97799026Sjulian/* 978103367Sjulian * Allocate a ksegrp. 979103367Sjulian */ 980103367Sjulianstruct ksegrp * 981103367Sjulianksegrp_alloc(void) 982103367Sjulian{ 983111119Simp return (uma_zalloc(ksegrp_zone, M_WAITOK)); 984103367Sjulian} 985103367Sjulian 986103367Sjulian/* 987103367Sjulian * Allocate a kse. 988103367Sjulian */ 989103367Sjulianstruct kse * 990103367Sjuliankse_alloc(void) 991103367Sjulian{ 992111119Simp return (uma_zalloc(kse_zone, M_WAITOK)); 993103367Sjulian} 994103367Sjulian 995103367Sjulian/* 99699026Sjulian * Allocate a thread. 99799026Sjulian */ 99899026Sjulianstruct thread * 99999026Sjulianthread_alloc(void) 100099026Sjulian{ 100199026Sjulian thread_reap(); /* check if any zombies to get */ 1002111119Simp return (uma_zalloc(thread_zone, M_WAITOK)); 100399026Sjulian} 100499026Sjulian 100599026Sjulian/* 1006103367Sjulian * Deallocate a ksegrp. 1007103367Sjulian */ 1008103367Sjulianvoid 1009103367Sjulianksegrp_free(struct ksegrp *td) 1010103367Sjulian{ 1011103367Sjulian uma_zfree(ksegrp_zone, td); 1012103367Sjulian} 1013103367Sjulian 1014103367Sjulian/* 1015103367Sjulian * Deallocate a kse. 1016103367Sjulian */ 1017103367Sjulianvoid 1018103367Sjuliankse_free(struct kse *td) 1019103367Sjulian{ 1020103367Sjulian uma_zfree(kse_zone, td); 1021103367Sjulian} 1022103367Sjulian 1023103367Sjulian/* 102499026Sjulian * Deallocate a thread. 102599026Sjulian */ 102699026Sjulianvoid 102799026Sjulianthread_free(struct thread *td) 102899026Sjulian{ 1029107719Sjulian 1030107719Sjulian cpu_thread_clean(td); 103199026Sjulian uma_zfree(thread_zone, td); 103299026Sjulian} 103399026Sjulian 103499026Sjulian/* 103599026Sjulian * Store the thread context in the UTS's mailbox. 1036104031Sjulian * then add the mailbox at the head of a list we are building in user space. 1037104031Sjulian * The list is anchored in the ksegrp structure. 103899026Sjulian */ 103999026Sjulianint 1040117704Sdavidxuthread_export_context(struct thread *td, int willexit) 104199026Sjulian{ 1042104503Sjmallett struct proc *p; 1043104031Sjulian struct ksegrp *kg; 1044104031Sjulian uintptr_t mbx; 1045104031Sjulian void *addr; 1046116963Sdavidxu int error = 0, temp, sig; 1047115790Sjulian mcontext_t mc; 104899026Sjulian 1049104503Sjmallett p = td->td_proc; 1050104503Sjmallett kg = td->td_ksegrp; 1051104503Sjmallett 1052104031Sjulian /* Export the user/machine context. */ 1053115790Sjulian get_mcontext(td, &mc, 0); 1054115790Sjulian addr = (void *)(&td->td_mailbox->tm_context.uc_mcontext); 1055115790Sjulian error = copyout(&mc, addr, sizeof(mcontext_t)); 1056115790Sjulian if (error) 1057108338Sjulian goto bad; 1058104031Sjulian 1059111028Sjeff /* Exports clock ticks in kernel mode */ 1060111028Sjeff addr = (caddr_t)(&td->td_mailbox->tm_sticks); 1061117000Smarcel temp = fuword32(addr) + td->td_usticks; 1062117000Smarcel if (suword32(addr, temp)) { 1063115790Sjulian error = EFAULT; 1064111028Sjeff goto bad; 1065115790Sjulian } 1066111028Sjeff 1067116963Sdavidxu /* 1068116963Sdavidxu * Post sync signal, or process SIGKILL and SIGSTOP. 1069116963Sdavidxu * For sync signal, it is only possible when the signal is not 1070116963Sdavidxu * caught by userland or process is being debugged. 1071116963Sdavidxu */ 1072117704Sdavidxu PROC_LOCK(p); 1073116963Sdavidxu if (td->td_flags & TDF_NEEDSIGCHK) { 1074116963Sdavidxu mtx_lock_spin(&sched_lock); 1075116963Sdavidxu td->td_flags &= ~TDF_NEEDSIGCHK; 1076116963Sdavidxu mtx_unlock_spin(&sched_lock); 1077116963Sdavidxu mtx_lock(&p->p_sigacts->ps_mtx); 1078116963Sdavidxu while ((sig = cursig(td)) != 0) 1079116963Sdavidxu postsig(sig); 1080116963Sdavidxu mtx_unlock(&p->p_sigacts->ps_mtx); 1081116963Sdavidxu } 1082117704Sdavidxu if (willexit) 1083117704Sdavidxu SIGFILLSET(td->td_sigmask); 1084117704Sdavidxu PROC_UNLOCK(p); 1085116963Sdavidxu 1086111028Sjeff /* Get address in latest mbox of list pointer */ 1087104031Sjulian addr = (void *)(&td->td_mailbox->tm_next); 1088104031Sjulian /* 1089104031Sjulian * Put the saved address of the previous first 1090104031Sjulian * entry into this one 1091104031Sjulian */ 1092104031Sjulian for (;;) { 1093104031Sjulian mbx = (uintptr_t)kg->kg_completed; 1094104031Sjulian if (suword(addr, mbx)) { 1095108338Sjulian error = EFAULT; 1096107034Sdavidxu goto bad; 1097104031Sjulian } 1098104126Sjulian PROC_LOCK(p); 1099104031Sjulian if (mbx == (uintptr_t)kg->kg_completed) { 1100104031Sjulian kg->kg_completed = td->td_mailbox; 1101111028Sjeff /* 1102111028Sjeff * The thread context may be taken away by 1103111028Sjeff * other upcall threads when we unlock 1104111028Sjeff * process lock. it's no longer valid to 1105111028Sjeff * use it again in any other places. 1106111028Sjeff */ 1107111028Sjeff td->td_mailbox = NULL; 1108104126Sjulian PROC_UNLOCK(p); 1109104031Sjulian break; 1110104031Sjulian } 1111104126Sjulian PROC_UNLOCK(p); 1112104031Sjulian } 1113111028Sjeff td->td_usticks = 0; 1114104031Sjulian return (0); 1115107034Sdavidxu 1116107034Sdavidxubad: 1117107034Sdavidxu PROC_LOCK(p); 1118117704Sdavidxu sigexit(td, SIGILL); 1119108338Sjulian return (error); 1120104031Sjulian} 112199026Sjulian 1122104031Sjulian/* 1123104031Sjulian * Take the list of completed mailboxes for this KSEGRP and put them on this 1124111028Sjeff * upcall's mailbox as it's the next one going up. 1125104031Sjulian */ 1126104031Sjulianstatic int 1127111028Sjeffthread_link_mboxes(struct ksegrp *kg, struct kse_upcall *ku) 1128104031Sjulian{ 1129104126Sjulian struct proc *p = kg->kg_proc; 1130104031Sjulian void *addr; 1131104031Sjulian uintptr_t mbx; 1132104031Sjulian 1133111028Sjeff addr = (void *)(&ku->ku_mailbox->km_completed); 1134104031Sjulian for (;;) { 1135104031Sjulian mbx = (uintptr_t)kg->kg_completed; 1136104031Sjulian if (suword(addr, mbx)) { 1137104126Sjulian PROC_LOCK(p); 1138104126Sjulian psignal(p, SIGSEGV); 1139104126Sjulian PROC_UNLOCK(p); 1140104031Sjulian return (EFAULT); 1141104031Sjulian } 1142104126Sjulian PROC_LOCK(p); 1143104031Sjulian if (mbx == (uintptr_t)kg->kg_completed) { 1144104031Sjulian kg->kg_completed = NULL; 1145104126Sjulian PROC_UNLOCK(p); 1146104031Sjulian break; 1147104031Sjulian } 1148104126Sjulian PROC_UNLOCK(p); 114999026Sjulian } 1150104031Sjulian return (0); 115199026Sjulian} 115299026Sjulian 115399026Sjulian/* 1154107034Sdavidxu * This function should be called at statclock interrupt time 1155107034Sdavidxu */ 1156107034Sdavidxuint 1157111028Sjeffthread_statclock(int user) 1158107034Sdavidxu{ 1159107034Sdavidxu struct thread *td = curthread; 1160116401Sdavidxu struct ksegrp *kg = td->td_ksegrp; 1161124350Sschweikh 1162116401Sdavidxu if (kg->kg_numupcalls == 0 || !(td->td_flags & TDF_SA)) 1163116401Sdavidxu return (0); 1164107034Sdavidxu if (user) { 1165107034Sdavidxu /* Current always do via ast() */ 1166111976Sdavidxu mtx_lock_spin(&sched_lock); 1167111032Sjulian td->td_flags |= (TDF_USTATCLOCK|TDF_ASTPENDING); 1168111976Sdavidxu mtx_unlock_spin(&sched_lock); 1169111028Sjeff td->td_uuticks++; 1170107034Sdavidxu } else { 1171107034Sdavidxu if (td->td_mailbox != NULL) 1172111028Sjeff td->td_usticks++; 1173111028Sjeff else { 1174111028Sjeff /* XXXKSE 1175111028Sjeff * We will call thread_user_enter() for every 1176111028Sjeff * kernel entry in future, so if the thread mailbox 1177111028Sjeff * is NULL, it must be a UTS kernel, don't account 1178111028Sjeff * clock ticks for it. 1179111028Sjeff */ 1180111028Sjeff } 1181107034Sdavidxu } 1182111028Sjeff return (0); 1183107034Sdavidxu} 1184107034Sdavidxu 1185111028Sjeff/* 1186111515Sdavidxu * Export state clock ticks for userland 1187111028Sjeff */ 1188107034Sdavidxustatic int 1189111515Sdavidxuthread_update_usr_ticks(struct thread *td, int user) 1190107034Sdavidxu{ 1191107034Sdavidxu struct proc *p = td->td_proc; 1192107034Sdavidxu struct kse_thr_mailbox *tmbx; 1193111028Sjeff struct kse_upcall *ku; 1194112397Sdavidxu struct ksegrp *kg; 1195107034Sdavidxu caddr_t addr; 1196118607Sjhb u_int uticks; 1197107034Sdavidxu 1198111028Sjeff if ((ku = td->td_upcall) == NULL) 1199111028Sjeff return (-1); 1200124350Sschweikh 1201111028Sjeff tmbx = (void *)fuword((void *)&ku->ku_mailbox->km_curthread); 1202107034Sdavidxu if ((tmbx == NULL) || (tmbx == (void *)-1)) 1203111028Sjeff return (-1); 1204111515Sdavidxu if (user) { 1205111515Sdavidxu uticks = td->td_uuticks; 1206111515Sdavidxu td->td_uuticks = 0; 1207111515Sdavidxu addr = (caddr_t)&tmbx->tm_uticks; 1208111515Sdavidxu } else { 1209111515Sdavidxu uticks = td->td_usticks; 1210111515Sdavidxu td->td_usticks = 0; 1211111515Sdavidxu addr = (caddr_t)&tmbx->tm_sticks; 1212111515Sdavidxu } 1213107034Sdavidxu if (uticks) { 1214117000Smarcel if (suword32(addr, uticks+fuword32(addr))) { 1215111028Sjeff PROC_LOCK(p); 1216111028Sjeff psignal(p, SIGSEGV); 1217111028Sjeff PROC_UNLOCK(p); 1218111028Sjeff return (-2); 1219111028Sjeff } 1220107034Sdavidxu } 1221112397Sdavidxu kg = td->td_ksegrp; 1222112397Sdavidxu if (kg->kg_upquantum && ticks >= kg->kg_nextupcall) { 1223112397Sdavidxu mtx_lock_spin(&sched_lock); 1224112397Sdavidxu td->td_upcall->ku_flags |= KUF_DOUPCALL; 1225112397Sdavidxu mtx_unlock_spin(&sched_lock); 1226112397Sdavidxu } 1227111028Sjeff return (0); 1228111028Sjeff} 1229111028Sjeff 1230111028Sjeff/* 123199026Sjulian * Discard the current thread and exit from its context. 123299026Sjulian * 123399026Sjulian * Because we can't free a thread while we're operating under its context, 1234107719Sjulian * push the current thread into our CPU's deadthread holder. This means 1235107719Sjulian * we needn't worry about someone else grabbing our context before we 1236107719Sjulian * do a cpu_throw(). 123799026Sjulian */ 123899026Sjulianvoid 123999026Sjulianthread_exit(void) 124099026Sjulian{ 124199026Sjulian struct thread *td; 124299026Sjulian struct kse *ke; 124399026Sjulian struct proc *p; 124499026Sjulian struct ksegrp *kg; 124599026Sjulian 124699026Sjulian td = curthread; 124799026Sjulian kg = td->td_ksegrp; 124899026Sjulian p = td->td_proc; 124999026Sjulian ke = td->td_kse; 125099026Sjulian 125199026Sjulian mtx_assert(&sched_lock, MA_OWNED); 1252102581Sjulian KASSERT(p != NULL, ("thread exiting without a process")); 1253102581Sjulian KASSERT(ke != NULL, ("thread exiting without a kse")); 1254102581Sjulian KASSERT(kg != NULL, ("thread exiting without a kse group")); 125599026Sjulian PROC_LOCK_ASSERT(p, MA_OWNED); 125699026Sjulian CTR1(KTR_PROC, "thread_exit: thread %p", td); 1257125158Sjhb mtx_assert(&Giant, MA_NOTOWNED); 125899026Sjulian 1259104695Sjulian if (td->td_standin != NULL) { 1260104695Sjulian thread_stash(td->td_standin); 1261104695Sjulian td->td_standin = NULL; 1262104695Sjulian } 1263104695Sjulian 126499026Sjulian cpu_thread_exit(td); /* XXXSMP */ 126599026Sjulian 1266102581Sjulian /* 1267103002Sjulian * The last thread is left attached to the process 1268103002Sjulian * So that the whole bundle gets recycled. Skip 1269103002Sjulian * all this stuff. 1270102581Sjulian */ 1271103002Sjulian if (p->p_numthreads > 1) { 1272113641Sjulian thread_unlink(td); 1273111115Sdavidxu if (p->p_maxthrwaits) 1274111115Sdavidxu wakeup(&p->p_numthreads); 1275103002Sjulian /* 1276103002Sjulian * The test below is NOT true if we are the 1277103002Sjulian * sole exiting thread. P_STOPPED_SNGL is unset 1278103002Sjulian * in exit1() after it is the only survivor. 1279103002Sjulian */ 1280103002Sjulian if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) { 1281103002Sjulian if (p->p_numthreads == p->p_suspcount) { 1282103216Sjulian thread_unsuspend_one(p->p_singlethread); 1283103002Sjulian } 128499026Sjulian } 1285104695Sjulian 1286111028Sjeff /* 1287111028Sjeff * Because each upcall structure has an owner thread, 1288111028Sjeff * owner thread exits only when process is in exiting 1289111028Sjeff * state, so upcall to userland is no longer needed, 1290111028Sjeff * deleting upcall structure is safe here. 1291111028Sjeff * So when all threads in a group is exited, all upcalls 1292111028Sjeff * in the group should be automatically freed. 1293111028Sjeff */ 1294111028Sjeff if (td->td_upcall) 1295111028Sjeff upcall_remove(td); 1296124350Sschweikh 1297119488Sdavidxu sched_exit_thread(FIRST_THREAD_IN_PROC(p), td); 1298119488Sdavidxu sched_exit_kse(FIRST_KSE_IN_PROC(p), ke); 1299104695Sjulian ke->ke_state = KES_UNQUEUED; 1300111028Sjeff ke->ke_thread = NULL; 1301124350Sschweikh /* 1302108338Sjulian * Decide what to do with the KSE attached to this thread. 1303104695Sjulian */ 1304119488Sdavidxu if (ke->ke_flags & KEF_EXIT) { 1305105854Sjulian kse_unlink(ke); 1306119488Sdavidxu if (kg->kg_kses == 0) { 1307119488Sdavidxu sched_exit_ksegrp(FIRST_KSEGRP_IN_PROC(p), kg); 1308119488Sdavidxu ksegrp_unlink(kg); 1309119488Sdavidxu } 1310119488Sdavidxu } 1311111028Sjeff else 1312105854Sjulian kse_reassign(ke); 1313105854Sjulian PROC_UNLOCK(p); 1314111028Sjeff td->td_kse = NULL; 1315105854Sjulian td->td_state = TDS_INACTIVE; 1316113244Sdavidxu#if 0 1317105854Sjulian td->td_proc = NULL; 1318113244Sdavidxu#endif 1319105854Sjulian td->td_ksegrp = NULL; 1320105854Sjulian td->td_last_kse = NULL; 1321107719Sjulian PCPU_SET(deadthread, td); 1322103002Sjulian } else { 1323103002Sjulian PROC_UNLOCK(p); 132499026Sjulian } 1325112888Sjeff /* XXX Shouldn't cpu_throw() here. */ 1326112993Speter mtx_assert(&sched_lock, MA_OWNED); 1327112993Speter cpu_throw(td, choosethread()); 1328112993Speter panic("I'm a teapot!"); 132999026Sjulian /* NOTREACHED */ 133099026Sjulian} 133199026Sjulian 1332124350Sschweikh/* 1333107719Sjulian * Do any thread specific cleanups that may be needed in wait() 1334107719Sjulian * called with Giant held, proc and schedlock not held. 1335107719Sjulian */ 1336107719Sjulianvoid 1337107719Sjulianthread_wait(struct proc *p) 1338107719Sjulian{ 1339107719Sjulian struct thread *td; 1340107719Sjulian 1341124350Sschweikh KASSERT((p->p_numthreads == 1), ("Multiple threads in wait1()")); 1342124350Sschweikh KASSERT((p->p_numksegrps == 1), ("Multiple ksegrps in wait1()")); 1343107719Sjulian FOREACH_THREAD_IN_PROC(p, td) { 1344107719Sjulian if (td->td_standin != NULL) { 1345107719Sjulian thread_free(td->td_standin); 1346107719Sjulian td->td_standin = NULL; 1347107719Sjulian } 1348107719Sjulian cpu_thread_clean(td); 1349107719Sjulian } 1350107719Sjulian thread_reap(); /* check for zombie threads etc. */ 1351107719Sjulian} 1352107719Sjulian 135399026Sjulian/* 135499026Sjulian * Link a thread to a process. 1355103002Sjulian * set up anything that needs to be initialized for it to 1356103002Sjulian * be used by the process. 135799026Sjulian * 135899026Sjulian * Note that we do not link to the proc's ucred here. 135999026Sjulian * The thread is linked as if running but no KSE assigned. 136099026Sjulian */ 136199026Sjulianvoid 136299026Sjulianthread_link(struct thread *td, struct ksegrp *kg) 136399026Sjulian{ 136499026Sjulian struct proc *p; 136599026Sjulian 136699026Sjulian p = kg->kg_proc; 1367111028Sjeff td->td_state = TDS_INACTIVE; 1368111028Sjeff td->td_proc = p; 1369111028Sjeff td->td_ksegrp = kg; 1370111028Sjeff td->td_last_kse = NULL; 1371111028Sjeff td->td_flags = 0; 1372111028Sjeff td->td_kse = NULL; 137399026Sjulian 1374103002Sjulian LIST_INIT(&td->td_contested); 1375119137Ssam callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 137699026Sjulian TAILQ_INSERT_HEAD(&p->p_threads, td, td_plist); 137799026Sjulian TAILQ_INSERT_HEAD(&kg->kg_threads, td, td_kglist); 137899026Sjulian p->p_numthreads++; 137999026Sjulian kg->kg_numthreads++; 138099026Sjulian} 138199026Sjulian 1382113641Sjulianvoid 1383113641Sjulianthread_unlink(struct thread *td) 1384124350Sschweikh{ 1385113641Sjulian struct proc *p = td->td_proc; 1386113641Sjulian struct ksegrp *kg = td->td_ksegrp; 1387113920Sjhb 1388113920Sjhb mtx_assert(&sched_lock, MA_OWNED); 1389113641Sjulian TAILQ_REMOVE(&p->p_threads, td, td_plist); 1390113641Sjulian p->p_numthreads--; 1391113641Sjulian TAILQ_REMOVE(&kg->kg_threads, td, td_kglist); 1392113641Sjulian kg->kg_numthreads--; 1393113641Sjulian /* could clear a few other things here */ 1394124350Sschweikh} 1395113641Sjulian 1396111028Sjeff/* 1397111028Sjeff * Purge a ksegrp resource. When a ksegrp is preparing to 1398124350Sschweikh * exit, it calls this function. 1399111028Sjeff */ 1400113864Sjhbstatic void 1401111028Sjeffkse_purge_group(struct thread *td) 1402111028Sjeff{ 1403111028Sjeff struct ksegrp *kg; 1404111028Sjeff struct kse *ke; 1405111028Sjeff 1406111028Sjeff kg = td->td_ksegrp; 1407111028Sjeff KASSERT(kg->kg_numthreads == 1, ("%s: bad thread number", __func__)); 1408111028Sjeff while ((ke = TAILQ_FIRST(&kg->kg_iq)) != NULL) { 1409111028Sjeff KASSERT(ke->ke_state == KES_IDLE, 1410111028Sjeff ("%s: wrong idle KSE state", __func__)); 1411111028Sjeff kse_unlink(ke); 1412111028Sjeff } 1413111028Sjeff KASSERT((kg->kg_kses == 1), 1414111028Sjeff ("%s: ksegrp still has %d KSEs", __func__, kg->kg_kses)); 1415111028Sjeff KASSERT((kg->kg_numupcalls == 0), 1416111028Sjeff ("%s: ksegrp still has %d upcall datas", 1417111028Sjeff __func__, kg->kg_numupcalls)); 1418111028Sjeff} 1419111028Sjeff 1420111028Sjeff/* 1421124350Sschweikh * Purge a process's KSE resource. When a process is preparing to 1422124350Sschweikh * exit, it calls kse_purge to release any extra KSE resources in 1423111028Sjeff * the process. 1424111028Sjeff */ 1425113864Sjhbstatic void 1426105854Sjuliankse_purge(struct proc *p, struct thread *td) 1427105854Sjulian{ 1428105854Sjulian struct ksegrp *kg; 1429111028Sjeff struct kse *ke; 1430105854Sjulian 1431105854Sjulian KASSERT(p->p_numthreads == 1, ("bad thread number")); 1432105854Sjulian while ((kg = TAILQ_FIRST(&p->p_ksegrps)) != NULL) { 1433105854Sjulian TAILQ_REMOVE(&p->p_ksegrps, kg, kg_ksegrp); 1434105854Sjulian p->p_numksegrps--; 1435111028Sjeff /* 1436111028Sjeff * There is no ownership for KSE, after all threads 1437124350Sschweikh * in the group exited, it is possible that some KSEs 1438111028Sjeff * were left in idle queue, gc them now. 1439111028Sjeff */ 1440111028Sjeff while ((ke = TAILQ_FIRST(&kg->kg_iq)) != NULL) { 1441111028Sjeff KASSERT(ke->ke_state == KES_IDLE, 1442111028Sjeff ("%s: wrong idle KSE state", __func__)); 1443111028Sjeff TAILQ_REMOVE(&kg->kg_iq, ke, ke_kgrlist); 1444111028Sjeff kg->kg_idle_kses--; 1445111028Sjeff TAILQ_REMOVE(&kg->kg_kseq, ke, ke_kglist); 1446111028Sjeff kg->kg_kses--; 1447111028Sjeff kse_stash(ke); 1448111028Sjeff } 1449105854Sjulian KASSERT(((kg->kg_kses == 0) && (kg != td->td_ksegrp)) || 1450111028Sjeff ((kg->kg_kses == 1) && (kg == td->td_ksegrp)), 1451111028Sjeff ("ksegrp has wrong kg_kses: %d", kg->kg_kses)); 1452111028Sjeff KASSERT((kg->kg_numupcalls == 0), 1453111028Sjeff ("%s: ksegrp still has %d upcall datas", 1454111028Sjeff __func__, kg->kg_numupcalls)); 1455124350Sschweikh 1456111028Sjeff if (kg != td->td_ksegrp) 1457105854Sjulian ksegrp_stash(kg); 1458105854Sjulian } 1459105854Sjulian TAILQ_INSERT_HEAD(&p->p_ksegrps, td->td_ksegrp, kg_ksegrp); 1460105854Sjulian p->p_numksegrps++; 1461105854Sjulian} 1462105854Sjulian 1463111028Sjeff/* 1464111028Sjeff * This function is intended to be used to initialize a spare thread 1465111028Sjeff * for upcall. Initialize thread's large data area outside sched_lock 1466111028Sjeff * for thread_schedule_upcall(). 1467111028Sjeff */ 1468111028Sjeffvoid 1469111028Sjeffthread_alloc_spare(struct thread *td, struct thread *spare) 1470111028Sjeff{ 1471111028Sjeff if (td->td_standin) 1472111028Sjeff return; 1473111028Sjeff if (spare == NULL) 1474111028Sjeff spare = thread_alloc(); 1475111028Sjeff td->td_standin = spare; 1476111028Sjeff bzero(&spare->td_startzero, 1477111028Sjeff (unsigned)RANGEOF(struct thread, td_startzero, td_endzero)); 1478111028Sjeff spare->td_proc = td->td_proc; 1479111028Sjeff spare->td_ucred = crhold(td->td_ucred); 1480111028Sjeff} 1481105854Sjulian 148299026Sjulian/* 1483103410Smini * Create a thread and schedule it for upcall on the KSE given. 1484108338Sjulian * Use our thread's standin so that we don't have to allocate one. 148599026Sjulian */ 148699026Sjulianstruct thread * 1487111028Sjeffthread_schedule_upcall(struct thread *td, struct kse_upcall *ku) 148899026Sjulian{ 148999026Sjulian struct thread *td2; 149099026Sjulian 149199026Sjulian mtx_assert(&sched_lock, MA_OWNED); 1492104695Sjulian 1493124350Sschweikh /* 1494111028Sjeff * Schedule an upcall thread on specified kse_upcall, 1495111028Sjeff * the kse_upcall must be free. 1496111028Sjeff * td must have a spare thread. 1497104695Sjulian */ 1498111028Sjeff KASSERT(ku->ku_owner == NULL, ("%s: upcall has owner", __func__)); 1499104695Sjulian if ((td2 = td->td_standin) != NULL) { 1500104695Sjulian td->td_standin = NULL; 150199026Sjulian } else { 1502111028Sjeff panic("no reserve thread when scheduling an upcall"); 1503106182Sdavidxu return (NULL); 150499026Sjulian } 150599026Sjulian CTR3(KTR_PROC, "thread_schedule_upcall: thread %p (pid %d, %s)", 1506104695Sjulian td2, td->td_proc->p_pid, td->td_proc->p_comm); 1507103002Sjulian bcopy(&td->td_startcopy, &td2->td_startcopy, 1508103002Sjulian (unsigned) RANGEOF(struct thread, td_startcopy, td_endcopy)); 1509111028Sjeff thread_link(td2, ku->ku_ksegrp); 1510113244Sdavidxu /* inherit blocked thread's context */ 1511115858Smarcel cpu_set_upcall(td2, td); 1512111028Sjeff /* Let the new thread become owner of the upcall */ 1513111028Sjeff ku->ku_owner = td2; 1514111028Sjeff td2->td_upcall = ku; 1515116401Sdavidxu td2->td_flags = TDF_SA; 1516116372Sdavidxu td2->td_pflags = TDP_UPCALLING; 1517111028Sjeff td2->td_kse = NULL; 1518111028Sjeff td2->td_state = TDS_CAN_RUN; 1519104695Sjulian td2->td_inhibitors = 0; 1520116963Sdavidxu SIGFILLSET(td2->td_sigmask); 1521116963Sdavidxu SIG_CANTMASK(td2->td_sigmask); 1522119488Sdavidxu sched_fork_thread(td, td2); 1523104695Sjulian return (td2); /* bogus.. should be a void function */ 152499026Sjulian} 152599026Sjulian 1526116963Sdavidxu/* 1527116963Sdavidxu * It is only used when thread generated a trap and process is being 1528116963Sdavidxu * debugged. 1529116963Sdavidxu */ 1530111033Sjeffvoid 1531111033Sjeffthread_signal_add(struct thread *td, int sig) 1532103410Smini{ 1533111033Sjeff struct proc *p; 1534116963Sdavidxu siginfo_t siginfo; 1535116963Sdavidxu struct sigacts *ps; 1536103410Smini int error; 1537103410Smini 1538115884Sdavidxu p = td->td_proc; 1539115884Sdavidxu PROC_LOCK_ASSERT(p, MA_OWNED); 1540116963Sdavidxu ps = p->p_sigacts; 1541116963Sdavidxu mtx_assert(&ps->ps_mtx, MA_OWNED); 1542116963Sdavidxu 1543117607Sdavidxu cpu_thread_siginfo(sig, 0, &siginfo); 1544116963Sdavidxu mtx_unlock(&ps->ps_mtx); 1545103410Smini PROC_UNLOCK(p); 1546116963Sdavidxu error = copyout(&siginfo, &td->td_mailbox->tm_syncsig, sizeof(siginfo)); 1547116963Sdavidxu if (error) { 1548116963Sdavidxu PROC_LOCK(p); 1549116963Sdavidxu sigexit(td, SIGILL); 1550116963Sdavidxu } 1551103410Smini PROC_LOCK(p); 1552116963Sdavidxu SIGADDSET(td->td_sigmask, sig); 1553116963Sdavidxu mtx_lock(&ps->ps_mtx); 1554111033Sjeff} 1555111033Sjeff 1556111033Sjeffvoid 1557112397Sdavidxuthread_switchout(struct thread *td) 1558112397Sdavidxu{ 1559112397Sdavidxu struct kse_upcall *ku; 1560116607Sdavidxu struct thread *td2; 1561112397Sdavidxu 1562112397Sdavidxu mtx_assert(&sched_lock, MA_OWNED); 1563112397Sdavidxu 1564112397Sdavidxu /* 1565112397Sdavidxu * If the outgoing thread is in threaded group and has never 1566112397Sdavidxu * scheduled an upcall, decide whether this is a short 1567112397Sdavidxu * or long term event and thus whether or not to schedule 1568112397Sdavidxu * an upcall. 1569112397Sdavidxu * If it is a short term event, just suspend it in 1570112397Sdavidxu * a way that takes its KSE with it. 1571112397Sdavidxu * Select the events for which we want to schedule upcalls. 1572112397Sdavidxu * For now it's just sleep. 1573112397Sdavidxu * XXXKSE eventually almost any inhibition could do. 1574112397Sdavidxu */ 1575112397Sdavidxu if (TD_CAN_UNBIND(td) && (td->td_standin) && TD_ON_SLEEPQ(td)) { 1576124350Sschweikh /* 1577112397Sdavidxu * Release ownership of upcall, and schedule an upcall 1578112397Sdavidxu * thread, this new upcall thread becomes the owner of 1579112397Sdavidxu * the upcall structure. 1580112397Sdavidxu */ 1581112397Sdavidxu ku = td->td_upcall; 1582112397Sdavidxu ku->ku_owner = NULL; 1583124350Sschweikh td->td_upcall = NULL; 1584112397Sdavidxu td->td_flags &= ~TDF_CAN_UNBIND; 1585116607Sdavidxu td2 = thread_schedule_upcall(td, ku); 1586116607Sdavidxu setrunqueue(td2); 1587112397Sdavidxu } 1588112397Sdavidxu} 1589112397Sdavidxu 1590103410Smini/* 1591111028Sjeff * Setup done on the thread when it enters the kernel. 1592105900Sjulian * XXXKSE Presently only for syscalls but eventually all kernel entries. 1593105900Sjulian */ 1594105900Sjulianvoid 1595105900Sjulianthread_user_enter(struct proc *p, struct thread *td) 1596105900Sjulian{ 1597111028Sjeff struct ksegrp *kg; 1598111028Sjeff struct kse_upcall *ku; 1599113793Sdavidxu struct kse_thr_mailbox *tmbx; 1600118486Sdavidxu uint32_t tflags; 1601105900Sjulian 1602111028Sjeff kg = td->td_ksegrp; 1603113793Sdavidxu 1604105900Sjulian /* 1605105900Sjulian * First check that we shouldn't just abort. 1606105900Sjulian * But check if we are the single thread first! 1607105900Sjulian */ 1608116401Sdavidxu if (p->p_flag & P_SINGLE_EXIT) { 1609116401Sdavidxu PROC_LOCK(p); 1610105900Sjulian mtx_lock_spin(&sched_lock); 1611112071Sdavidxu thread_stopped(p); 1612105900Sjulian thread_exit(); 1613105900Sjulian /* NOTREACHED */ 1614105900Sjulian } 1615105900Sjulian 1616105900Sjulian /* 1617105900Sjulian * If we are doing a syscall in a KSE environment, 1618105900Sjulian * note where our mailbox is. There is always the 1619108338Sjulian * possibility that we could do this lazily (in kse_reassign()), 1620105900Sjulian * but for now do it every time. 1621105900Sjulian */ 1622111028Sjeff kg = td->td_ksegrp; 1623116401Sdavidxu if (td->td_flags & TDF_SA) { 1624111028Sjeff ku = td->td_upcall; 1625111028Sjeff KASSERT(ku, ("%s: no upcall owned", __func__)); 1626111028Sjeff KASSERT((ku->ku_owner == td), ("%s: wrong owner", __func__)); 1627113793Sdavidxu KASSERT(!TD_CAN_UNBIND(td), ("%s: can unbind", __func__)); 1628117000Smarcel ku->ku_mflags = fuword32((void *)&ku->ku_mailbox->km_flags); 1629113793Sdavidxu tmbx = (void *)fuword((void *)&ku->ku_mailbox->km_curthread); 1630118486Sdavidxu if ((tmbx == NULL) || (tmbx == (void *)-1L) || 1631118486Sdavidxu (ku->ku_mflags & KMF_NOUPCALL)) { 1632111028Sjeff td->td_mailbox = NULL; 1633105900Sjulian } else { 1634111115Sdavidxu if (td->td_standin == NULL) 1635111115Sdavidxu thread_alloc_spare(td, NULL); 1636118673Sdeischen tflags = fuword32(&tmbx->tm_flags); 1637118486Sdavidxu /* 1638118486Sdavidxu * On some architectures, TP register points to thread 1639124350Sschweikh * mailbox but not points to kse mailbox, and userland 1640124350Sschweikh * can not atomically clear km_curthread, but can 1641118486Sdavidxu * use TP register, and set TMF_NOUPCALL in thread 1642118486Sdavidxu * flag to indicate a critical region. 1643118486Sdavidxu */ 1644118486Sdavidxu if (tflags & TMF_NOUPCALL) { 1645118486Sdavidxu td->td_mailbox = NULL; 1646118486Sdavidxu } else { 1647118486Sdavidxu td->td_mailbox = tmbx; 1648118486Sdavidxu mtx_lock_spin(&sched_lock); 1649113793Sdavidxu td->td_flags |= TDF_CAN_UNBIND; 1650118486Sdavidxu mtx_unlock_spin(&sched_lock); 1651118486Sdavidxu } 1652105900Sjulian } 1653105900Sjulian } 1654105900Sjulian} 1655105900Sjulian 1656105900Sjulian/* 1657103410Smini * The extra work we go through if we are a threaded process when we 1658103410Smini * return to userland. 1659103410Smini * 166099026Sjulian * If we are a KSE process and returning to user mode, check for 166199026Sjulian * extra work to do before we return (e.g. for more syscalls 166299026Sjulian * to complete first). If we were in a critical section, we should 166399026Sjulian * just return to let it finish. Same if we were in the UTS (in 1664103410Smini * which case the mailbox's context's busy indicator will be set). 1665103410Smini * The only traps we suport will have set the mailbox. 1666103410Smini * We will clear it here. 166799026Sjulian */ 166899026Sjulianint 1669103838Sjulianthread_userret(struct thread *td, struct trapframe *frame) 167099026Sjulian{ 1671113793Sdavidxu int error = 0, upcalls, uts_crit; 1672111028Sjeff struct kse_upcall *ku; 1673111115Sdavidxu struct ksegrp *kg, *kg2; 1674104695Sjulian struct proc *p; 1675107060Sdavidxu struct timespec ts; 167699026Sjulian 1677111028Sjeff p = td->td_proc; 1678110190Sjulian kg = td->td_ksegrp; 1679116401Sdavidxu ku = td->td_upcall; 1680104695Sjulian 1681116401Sdavidxu /* Nothing to do with bound thread */ 1682116401Sdavidxu if (!(td->td_flags & TDF_SA)) 1683111028Sjeff return (0); 1684108338Sjulian 1685103410Smini /* 1686124350Sschweikh * Stat clock interrupt hit in userland, it 1687111028Sjeff * is returning from interrupt, charge thread's 1688111028Sjeff * userland time for UTS. 1689103410Smini */ 1690111028Sjeff if (td->td_flags & TDF_USTATCLOCK) { 1691111515Sdavidxu thread_update_usr_ticks(td, 1); 1692111028Sjeff mtx_lock_spin(&sched_lock); 1693111028Sjeff td->td_flags &= ~TDF_USTATCLOCK; 1694111028Sjeff mtx_unlock_spin(&sched_lock); 1695116401Sdavidxu if (kg->kg_completed || 1696111515Sdavidxu (td->td_upcall->ku_flags & KUF_DOUPCALL)) 1697111515Sdavidxu thread_user_enter(p, td); 1698111028Sjeff } 1699108338Sjulian 1700113793Sdavidxu uts_crit = (td->td_mailbox == NULL); 1701124350Sschweikh /* 1702111028Sjeff * Optimisation: 1703111028Sjeff * This thread has not started any upcall. 1704111028Sjeff * If there is no work to report other than ourself, 1705111028Sjeff * then it can return direct to userland. 1706111028Sjeff */ 1707108338Sjulian if (TD_CAN_UNBIND(td)) { 1708111028Sjeff mtx_lock_spin(&sched_lock); 1709111028Sjeff td->td_flags &= ~TDF_CAN_UNBIND; 1710112888Sjeff if ((td->td_flags & TDF_NEEDSIGCHK) == 0 && 1711112077Sdavidxu (kg->kg_completed == NULL) && 1712112397Sdavidxu (ku->ku_flags & KUF_DOUPCALL) == 0 && 1713113708Sdavidxu (kg->kg_upquantum && ticks < kg->kg_nextupcall)) { 1714112888Sjeff mtx_unlock_spin(&sched_lock); 1715111515Sdavidxu thread_update_usr_ticks(td, 0); 1716112222Sdavidxu nanotime(&ts); 1717112397Sdavidxu error = copyout(&ts, 1718112222Sdavidxu (caddr_t)&ku->ku_mailbox->km_timeofday, 1719112222Sdavidxu sizeof(ts)); 1720112077Sdavidxu td->td_mailbox = 0; 1721113793Sdavidxu ku->ku_mflags = 0; 1722112222Sdavidxu if (error) 1723112222Sdavidxu goto out; 1724112077Sdavidxu return (0); 1725108338Sjulian } 1726112888Sjeff mtx_unlock_spin(&sched_lock); 1727117704Sdavidxu thread_export_context(td, 0); 1728104695Sjulian /* 1729111028Sjeff * There is something to report, and we own an upcall 1730111028Sjeff * strucuture, we can go to userland. 1731111028Sjeff * Turn ourself into an upcall thread. 1732104695Sjulian */ 1733116372Sdavidxu td->td_pflags |= TDP_UPCALLING; 1734113793Sdavidxu } else if (td->td_mailbox && (ku == NULL)) { 1735117704Sdavidxu thread_export_context(td, 1); 1736112071Sdavidxu PROC_LOCK(p); 1737112071Sdavidxu /* 1738112071Sdavidxu * There are upcall threads waiting for 1739112071Sdavidxu * work to do, wake one of them up. 1740124350Sschweikh * XXXKSE Maybe wake all of them up. 1741112071Sdavidxu */ 1742117704Sdavidxu if (kg->kg_upsleeps) 1743112071Sdavidxu wakeup_one(&kg->kg_completed); 1744112071Sdavidxu mtx_lock_spin(&sched_lock); 1745112071Sdavidxu thread_stopped(p); 1746108338Sjulian thread_exit(); 1747111028Sjeff /* NOTREACHED */ 1748104695Sjulian } 1749104695Sjulian 1750116401Sdavidxu KASSERT(ku != NULL, ("upcall is NULL\n")); 1751111154Sdavidxu KASSERT(TD_CAN_UNBIND(td) == 0, ("can unbind")); 1752111154Sdavidxu 1753111154Sdavidxu if (p->p_numthreads > max_threads_per_proc) { 1754111154Sdavidxu max_threads_hits++; 1755111154Sdavidxu PROC_LOCK(p); 1756113920Sjhb mtx_lock_spin(&sched_lock); 1757116184Sdavidxu p->p_maxthrwaits++; 1758111154Sdavidxu while (p->p_numthreads > max_threads_per_proc) { 1759111154Sdavidxu upcalls = 0; 1760111154Sdavidxu FOREACH_KSEGRP_IN_PROC(p, kg2) { 1761111154Sdavidxu if (kg2->kg_numupcalls == 0) 1762111154Sdavidxu upcalls++; 1763111154Sdavidxu else 1764111154Sdavidxu upcalls += kg2->kg_numupcalls; 1765111154Sdavidxu } 1766111154Sdavidxu if (upcalls >= max_threads_per_proc) 1767111154Sdavidxu break; 1768114106Sdavidxu mtx_unlock_spin(&sched_lock); 1769116138Sdavidxu if (msleep(&p->p_numthreads, &p->p_mtx, PPAUSE|PCATCH, 1770123737Speter "maxthreads", 0)) { 1771116184Sdavidxu mtx_lock_spin(&sched_lock); 1772116184Sdavidxu break; 1773116184Sdavidxu } else { 1774116184Sdavidxu mtx_lock_spin(&sched_lock); 1775116184Sdavidxu } 1776111154Sdavidxu } 1777116184Sdavidxu p->p_maxthrwaits--; 1778113920Sjhb mtx_unlock_spin(&sched_lock); 1779111154Sdavidxu PROC_UNLOCK(p); 1780111154Sdavidxu } 1781111154Sdavidxu 1782116372Sdavidxu if (td->td_pflags & TDP_UPCALLING) { 1783113793Sdavidxu uts_crit = 0; 1784112397Sdavidxu kg->kg_nextupcall = ticks+kg->kg_upquantum; 1785124350Sschweikh /* 1786108338Sjulian * There is no more work to do and we are going to ride 1787111028Sjeff * this thread up to userland as an upcall. 1788108338Sjulian * Do the last parts of the setup needed for the upcall. 1789108338Sjulian */ 1790108338Sjulian CTR3(KTR_PROC, "userret: upcall thread %p (pid %d, %s)", 1791108338Sjulian td, td->td_proc->p_pid, td->td_proc->p_comm); 1792104695Sjulian 1793116372Sdavidxu td->td_pflags &= ~TDP_UPCALLING; 1794116401Sdavidxu if (ku->ku_flags & KUF_DOUPCALL) { 1795116401Sdavidxu mtx_lock_spin(&sched_lock); 1796111028Sjeff ku->ku_flags &= ~KUF_DOUPCALL; 1797116401Sdavidxu mtx_unlock_spin(&sched_lock); 1798116401Sdavidxu } 1799111028Sjeff /* 1800113793Sdavidxu * Set user context to the UTS 1801113793Sdavidxu */ 1802113793Sdavidxu if (!(ku->ku_mflags & KMF_NOUPCALL)) { 1803113793Sdavidxu cpu_set_upcall_kse(td, ku); 1804113793Sdavidxu error = suword(&ku->ku_mailbox->km_curthread, 0); 1805113793Sdavidxu if (error) 1806113793Sdavidxu goto out; 1807113793Sdavidxu } 1808113793Sdavidxu 1809113793Sdavidxu /* 1810108338Sjulian * Unhook the list of completed threads. 1811124350Sschweikh * anything that completes after this gets to 1812108338Sjulian * come in next time. 1813108338Sjulian * Put the list of completed thread mailboxes on 1814108338Sjulian * this KSE's mailbox. 1815108338Sjulian */ 1816113793Sdavidxu if (!(ku->ku_mflags & KMF_NOCOMPLETED) && 1817113793Sdavidxu (error = thread_link_mboxes(kg, ku)) != 0) 1818111115Sdavidxu goto out; 1819113793Sdavidxu } 1820113793Sdavidxu if (!uts_crit) { 1821107060Sdavidxu nanotime(&ts); 1822113793Sdavidxu error = copyout(&ts, &ku->ku_mailbox->km_timeofday, sizeof(ts)); 1823111115Sdavidxu } 1824111115Sdavidxu 1825111115Sdavidxuout: 1826111115Sdavidxu if (error) { 1827111115Sdavidxu /* 1828111129Sdavidxu * Things are going to be so screwed we should just kill 1829111129Sdavidxu * the process. 1830111115Sdavidxu * how do we do that? 1831111115Sdavidxu */ 1832111115Sdavidxu PROC_LOCK(td->td_proc); 1833111115Sdavidxu psignal(td->td_proc, SIGSEGV); 1834111115Sdavidxu PROC_UNLOCK(td->td_proc); 1835111115Sdavidxu } else { 1836111115Sdavidxu /* 1837111115Sdavidxu * Optimisation: 1838111115Sdavidxu * Ensure that we have a spare thread available, 1839111115Sdavidxu * for when we re-enter the kernel. 1840111115Sdavidxu */ 1841111115Sdavidxu if (td->td_standin == NULL) 1842111115Sdavidxu thread_alloc_spare(td, NULL); 1843111115Sdavidxu } 1844111115Sdavidxu 1845113793Sdavidxu ku->ku_mflags = 0; 1846111028Sjeff /* 1847111028Sjeff * Clear thread mailbox first, then clear system tick count. 1848124350Sschweikh * The order is important because thread_statclock() use 1849111028Sjeff * mailbox pointer to see if it is an userland thread or 1850111028Sjeff * an UTS kernel thread. 1851111028Sjeff */ 1852108338Sjulian td->td_mailbox = NULL; 1853111028Sjeff td->td_usticks = 0; 1854104695Sjulian return (error); /* go sync */ 185599026Sjulian} 185699026Sjulian 185799026Sjulian/* 185899026Sjulian * Enforce single-threading. 185999026Sjulian * 186099026Sjulian * Returns 1 if the caller must abort (another thread is waiting to 186199026Sjulian * exit the process or similar). Process is locked! 186299026Sjulian * Returns 0 when you are successfully the only thread running. 186399026Sjulian * A process has successfully single threaded in the suspend mode when 186499026Sjulian * There are no threads in user mode. Threads in the kernel must be 186599026Sjulian * allowed to continue until they get to the user boundary. They may even 186699026Sjulian * copy out their return values and data before suspending. They may however be 186799026Sjulian * accellerated in reaching the user boundary as we will wake up 186899026Sjulian * any sleeping threads that are interruptable. (PCATCH). 186999026Sjulian */ 187099026Sjulianint 187199026Sjulianthread_single(int force_exit) 187299026Sjulian{ 187399026Sjulian struct thread *td; 187499026Sjulian struct thread *td2; 187599026Sjulian struct proc *p; 187699026Sjulian 187799026Sjulian td = curthread; 187899026Sjulian p = td->td_proc; 1879107719Sjulian mtx_assert(&Giant, MA_OWNED); 188099026Sjulian PROC_LOCK_ASSERT(p, MA_OWNED); 188199026Sjulian KASSERT((td != NULL), ("curthread is NULL")); 188299026Sjulian 1883116361Sdavidxu if ((p->p_flag & P_SA) == 0 && p->p_numthreads == 1) 188499026Sjulian return (0); 188599026Sjulian 1886100648Sjulian /* Is someone already single threading? */ 1887124350Sschweikh if (p->p_singlethread) 188899026Sjulian return (1); 188999026Sjulian 1890108338Sjulian if (force_exit == SINGLE_EXIT) { 189199026Sjulian p->p_flag |= P_SINGLE_EXIT; 1892108338Sjulian } else 189399026Sjulian p->p_flag &= ~P_SINGLE_EXIT; 1894102950Sdavidxu p->p_flag |= P_STOPPED_SINGLE; 1895113920Sjhb mtx_lock_spin(&sched_lock); 189699026Sjulian p->p_singlethread = td; 189799026Sjulian while ((p->p_numthreads - p->p_suspcount) != 1) { 189899026Sjulian FOREACH_THREAD_IN_PROC(p, td2) { 189999026Sjulian if (td2 == td) 190099026Sjulian continue; 1901113705Sdavidxu td2->td_flags |= TDF_ASTPENDING; 1902103216Sjulian if (TD_IS_INHIBITED(td2)) { 1903105911Sjulian if (force_exit == SINGLE_EXIT) { 1904105911Sjulian if (TD_IS_SUSPENDED(td2)) { 1905103216Sjulian thread_unsuspend_one(td2); 1906105911Sjulian } 1907105911Sjulian if (TD_ON_SLEEPQ(td2) && 1908105911Sjulian (td2->td_flags & TDF_SINTR)) { 1909126326Sjhb sleepq_abort(td2); 1910105911Sjulian } 1911105911Sjulian } else { 1912105911Sjulian if (TD_IS_SUSPENDED(td2)) 1913105874Sdavidxu continue; 1914111028Sjeff /* 1915111028Sjeff * maybe other inhibitted states too? 1916111028Sjeff * XXXKSE Is it totally safe to 1917111028Sjeff * suspend a non-interruptable thread? 1918111028Sjeff */ 1919108338Sjulian if (td2->td_inhibitors & 1920111028Sjeff (TDI_SLEEPING | TDI_SWAPPED)) 1921105911Sjulian thread_suspend_one(td2); 192299026Sjulian } 192399026Sjulian } 192499026Sjulian } 1925124350Sschweikh /* 1926124350Sschweikh * Maybe we suspended some threads.. was it enough? 1927105911Sjulian */ 1928113920Sjhb if ((p->p_numthreads - p->p_suspcount) == 1) 1929105911Sjulian break; 1930105911Sjulian 193199026Sjulian /* 193299026Sjulian * Wake us up when everyone else has suspended. 1933100648Sjulian * In the mean time we suspend as well. 193499026Sjulian */ 1935103216Sjulian thread_suspend_one(td); 1936113795Sdavidxu DROP_GIANT(); 193799026Sjulian PROC_UNLOCK(p); 1938124944Sjeff mi_switch(SW_VOL); 193999026Sjulian mtx_unlock_spin(&sched_lock); 1940113795Sdavidxu PICKUP_GIANT(); 194199026Sjulian PROC_LOCK(p); 1942113920Sjhb mtx_lock_spin(&sched_lock); 194399026Sjulian } 1944124350Sschweikh if (force_exit == SINGLE_EXIT) { 1945113920Sjhb if (td->td_upcall) 1946111028Sjeff upcall_remove(td); 1947105854Sjulian kse_purge(p, td); 1948111028Sjeff } 1949113920Sjhb mtx_unlock_spin(&sched_lock); 195099026Sjulian return (0); 195199026Sjulian} 195299026Sjulian 195399026Sjulian/* 195499026Sjulian * Called in from locations that can safely check to see 195599026Sjulian * whether we have to suspend or at least throttle for a 195699026Sjulian * single-thread event (e.g. fork). 195799026Sjulian * 195899026Sjulian * Such locations include userret(). 195999026Sjulian * If the "return_instead" argument is non zero, the thread must be able to 196099026Sjulian * accept 0 (caller may continue), or 1 (caller must abort) as a result. 196199026Sjulian * 196299026Sjulian * The 'return_instead' argument tells the function if it may do a 196399026Sjulian * thread_exit() or suspend, or whether the caller must abort and back 196499026Sjulian * out instead. 196599026Sjulian * 196699026Sjulian * If the thread that set the single_threading request has set the 196799026Sjulian * P_SINGLE_EXIT bit in the process flags then this call will never return 196899026Sjulian * if 'return_instead' is false, but will exit. 196999026Sjulian * 197099026Sjulian * P_SINGLE_EXIT | return_instead == 0| return_instead != 0 197199026Sjulian *---------------+--------------------+--------------------- 197299026Sjulian * 0 | returns 0 | returns 0 or 1 197399026Sjulian * | when ST ends | immediatly 197499026Sjulian *---------------+--------------------+--------------------- 197599026Sjulian * 1 | thread exits | returns 1 197699026Sjulian * | | immediatly 197799026Sjulian * 0 = thread_exit() or suspension ok, 197899026Sjulian * other = return error instead of stopping the thread. 197999026Sjulian * 198099026Sjulian * While a full suspension is under effect, even a single threading 198199026Sjulian * thread would be suspended if it made this call (but it shouldn't). 198299026Sjulian * This call should only be made from places where 1983124350Sschweikh * thread_exit() would be safe as that may be the outcome unless 198499026Sjulian * return_instead is set. 198599026Sjulian */ 198699026Sjulianint 198799026Sjulianthread_suspend_check(int return_instead) 198899026Sjulian{ 1989104502Sjmallett struct thread *td; 1990104502Sjmallett struct proc *p; 199199026Sjulian 199299026Sjulian td = curthread; 199399026Sjulian p = td->td_proc; 199499026Sjulian PROC_LOCK_ASSERT(p, MA_OWNED); 199599026Sjulian while (P_SHOULDSTOP(p)) { 1996102950Sdavidxu if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) { 199799026Sjulian KASSERT(p->p_singlethread != NULL, 199899026Sjulian ("singlethread not set")); 199999026Sjulian /* 2000100648Sjulian * The only suspension in action is a 2001100648Sjulian * single-threading. Single threader need not stop. 2002124350Sschweikh * XXX Should be safe to access unlocked 2003100646Sjulian * as it can only be set to be true by us. 200499026Sjulian */ 2005100648Sjulian if (p->p_singlethread == td) 200699026Sjulian return (0); /* Exempt from stopping. */ 2007124350Sschweikh } 2008100648Sjulian if (return_instead) 200999026Sjulian return (1); 201099026Sjulian 2011112071Sdavidxu mtx_lock_spin(&sched_lock); 2012112071Sdavidxu thread_stopped(p); 201399026Sjulian /* 201499026Sjulian * If the process is waiting for us to exit, 201599026Sjulian * this thread should just suicide. 2016102950Sdavidxu * Assumes that P_SINGLE_EXIT implies P_STOPPED_SINGLE. 201799026Sjulian */ 201899026Sjulian if ((p->p_flag & P_SINGLE_EXIT) && (p->p_singlethread != td)) { 201999026Sjulian while (mtx_owned(&Giant)) 202099026Sjulian mtx_unlock(&Giant); 2021116361Sdavidxu if (p->p_flag & P_SA) 2022112910Sjeff thread_exit(); 2023112910Sjeff else 2024112910Sjeff thr_exit1(); 202599026Sjulian } 202699026Sjulian 202799026Sjulian /* 202899026Sjulian * When a thread suspends, it just 202999026Sjulian * moves to the processes's suspend queue 203099026Sjulian * and stays there. 203199026Sjulian */ 2032103216Sjulian thread_suspend_one(td); 2033102950Sdavidxu if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) { 2034100632Sjulian if (p->p_numthreads == p->p_suspcount) { 2035103216Sjulian thread_unsuspend_one(p->p_singlethread); 2036100632Sjulian } 2037100632Sjulian } 2038114398Sdavidxu DROP_GIANT(); 2039113864Sjhb PROC_UNLOCK(p); 2040124944Sjeff mi_switch(SW_INVOL); 204199026Sjulian mtx_unlock_spin(&sched_lock); 2042114398Sdavidxu PICKUP_GIANT(); 204399026Sjulian PROC_LOCK(p); 204499026Sjulian } 204599026Sjulian return (0); 204699026Sjulian} 204799026Sjulian 2048102898Sdavidxuvoid 2049102898Sdavidxuthread_suspend_one(struct thread *td) 2050102898Sdavidxu{ 2051102898Sdavidxu struct proc *p = td->td_proc; 2052102898Sdavidxu 2053102898Sdavidxu mtx_assert(&sched_lock, MA_OWNED); 2054113920Sjhb PROC_LOCK_ASSERT(p, MA_OWNED); 2055112071Sdavidxu KASSERT(!TD_IS_SUSPENDED(td), ("already suspended")); 2056102898Sdavidxu p->p_suspcount++; 2057103216Sjulian TD_SET_SUSPENDED(td); 2058102898Sdavidxu TAILQ_INSERT_TAIL(&p->p_suspended, td, td_runq); 2059103216Sjulian /* 2060103216Sjulian * Hack: If we are suspending but are on the sleep queue 2061103216Sjulian * then we are in msleep or the cv equivalent. We 2062103216Sjulian * want to look like we have two Inhibitors. 2063105911Sjulian * May already be set.. doesn't matter. 2064103216Sjulian */ 2065103216Sjulian if (TD_ON_SLEEPQ(td)) 2066103216Sjulian TD_SET_SLEEPING(td); 2067102898Sdavidxu} 2068102898Sdavidxu 2069102898Sdavidxuvoid 2070102898Sdavidxuthread_unsuspend_one(struct thread *td) 2071102898Sdavidxu{ 2072102898Sdavidxu struct proc *p = td->td_proc; 2073102898Sdavidxu 2074102898Sdavidxu mtx_assert(&sched_lock, MA_OWNED); 2075113920Sjhb PROC_LOCK_ASSERT(p, MA_OWNED); 2076102898Sdavidxu TAILQ_REMOVE(&p->p_suspended, td, td_runq); 2077103216Sjulian TD_CLR_SUSPENDED(td); 2078102898Sdavidxu p->p_suspcount--; 2079103216Sjulian setrunnable(td); 2080102898Sdavidxu} 2081102898Sdavidxu 208299026Sjulian/* 208399026Sjulian * Allow all threads blocked by single threading to continue running. 208499026Sjulian */ 208599026Sjulianvoid 208699026Sjulianthread_unsuspend(struct proc *p) 208799026Sjulian{ 208899026Sjulian struct thread *td; 208999026Sjulian 2090100646Sjulian mtx_assert(&sched_lock, MA_OWNED); 209199026Sjulian PROC_LOCK_ASSERT(p, MA_OWNED); 209299026Sjulian if (!P_SHOULDSTOP(p)) { 209399026Sjulian while (( td = TAILQ_FIRST(&p->p_suspended))) { 2094102898Sdavidxu thread_unsuspend_one(td); 209599026Sjulian } 2096102950Sdavidxu } else if ((P_SHOULDSTOP(p) == P_STOPPED_SINGLE) && 209799026Sjulian (p->p_numthreads == p->p_suspcount)) { 209899026Sjulian /* 209999026Sjulian * Stopping everything also did the job for the single 210099026Sjulian * threading request. Now we've downgraded to single-threaded, 210199026Sjulian * let it continue. 210299026Sjulian */ 2103102898Sdavidxu thread_unsuspend_one(p->p_singlethread); 210499026Sjulian } 210599026Sjulian} 210699026Sjulian 210799026Sjulianvoid 210899026Sjulianthread_single_end(void) 210999026Sjulian{ 211099026Sjulian struct thread *td; 211199026Sjulian struct proc *p; 211299026Sjulian 211399026Sjulian td = curthread; 211499026Sjulian p = td->td_proc; 211599026Sjulian PROC_LOCK_ASSERT(p, MA_OWNED); 2116102950Sdavidxu p->p_flag &= ~P_STOPPED_SINGLE; 2117113920Sjhb mtx_lock_spin(&sched_lock); 211899026Sjulian p->p_singlethread = NULL; 2119102292Sjulian /* 2120102292Sjulian * If there are other threads they mey now run, 2121102292Sjulian * unless of course there is a blanket 'stop order' 2122102292Sjulian * on the process. The single threader must be allowed 2123102292Sjulian * to continue however as this is a bad place to stop. 2124102292Sjulian */ 2125102292Sjulian if ((p->p_numthreads != 1) && (!P_SHOULDSTOP(p))) { 2126102292Sjulian while (( td = TAILQ_FIRST(&p->p_suspended))) { 2127103216Sjulian thread_unsuspend_one(td); 2128102292Sjulian } 2129102292Sjulian } 2130113920Sjhb mtx_unlock_spin(&sched_lock); 213199026Sjulian} 2132