kern_thread.c revision 111207
199026Sjulian/* 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 1099026Sjulian * 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 * $FreeBSD: head/sys/kern/kern_thread.c 111207 2003-02-21 07:11:38Z davidxu $ 2999026Sjulian */ 3099026Sjulian 3199026Sjulian#include <sys/param.h> 3299026Sjulian#include <sys/systm.h> 3399026Sjulian#include <sys/kernel.h> 3499026Sjulian#include <sys/lock.h> 3599026Sjulian#include <sys/malloc.h> 3699026Sjulian#include <sys/mutex.h> 3799026Sjulian#include <sys/proc.h> 38107029Sjulian#include <sys/smp.h> 3999026Sjulian#include <sys/sysctl.h> 40105854Sjulian#include <sys/sysproto.h> 4199026Sjulian#include <sys/filedesc.h> 42107126Sjeff#include <sys/sched.h> 4399026Sjulian#include <sys/signalvar.h> 4499026Sjulian#include <sys/sx.h> 45107126Sjeff#include <sys/tty.h> 4699026Sjulian#include <sys/user.h> 4799026Sjulian#include <sys/jail.h> 4899026Sjulian#include <sys/kse.h> 4999026Sjulian#include <sys/ktr.h> 50103410Smini#include <sys/ucontext.h> 5199026Sjulian 5299026Sjulian#include <vm/vm.h> 5399026Sjulian#include <vm/vm_object.h> 5499026Sjulian#include <vm/pmap.h> 5599026Sjulian#include <vm/uma.h> 5699026Sjulian#include <vm/vm_map.h> 5799026Sjulian 58100273Speter#include <machine/frame.h> 59100273Speter 6099026Sjulian/* 61103367Sjulian * KSEGRP related storage. 6299026Sjulian */ 63103367Sjulianstatic uma_zone_t ksegrp_zone; 64103367Sjulianstatic uma_zone_t kse_zone; 6599026Sjulianstatic uma_zone_t thread_zone; 66111028Sjeffstatic uma_zone_t upcall_zone; 6799026Sjulian 68103367Sjulian/* DEBUG ONLY */ 6999026SjulianSYSCTL_NODE(_kern, OID_AUTO, threads, CTLFLAG_RW, 0, "thread allocation"); 70107719Sjulianstatic int thread_debug = 0; 71107719SjulianSYSCTL_INT(_kern_threads, OID_AUTO, debug, CTLFLAG_RW, 72107719Sjulian &thread_debug, 0, "thread debug"); 7399026Sjulian 74107006Sdavidxustatic int max_threads_per_proc = 30; 75107006SdavidxuSYSCTL_INT(_kern_threads, OID_AUTO, max_threads_per_proc, CTLFLAG_RW, 76103367Sjulian &max_threads_per_proc, 0, "Limit on threads per proc"); 77103367Sjulian 78107006Sdavidxustatic int max_groups_per_proc = 5; 79107006SdavidxuSYSCTL_INT(_kern_threads, OID_AUTO, max_groups_per_proc, CTLFLAG_RW, 80107006Sdavidxu &max_groups_per_proc, 0, "Limit on thread groups per proc"); 81107006Sdavidxu 82111115Sdavidxustatic int max_threads_hits; 83111115SdavidxuSYSCTL_INT(_kern_threads, OID_AUTO, max_threads_hits, CTLFLAG_RD, 84111115Sdavidxu &max_threads_hits, 0, ""); 85111115Sdavidxu 86111028Sjeffstatic int virtual_cpu; 87111028Sjeff 8899026Sjulian#define RANGEOF(type, start, end) (offsetof(type, end) - offsetof(type, start)) 8999026Sjulian 90111028SjeffTAILQ_HEAD(, thread) zombie_threads = TAILQ_HEAD_INITIALIZER(zombie_threads); 91105854SjulianTAILQ_HEAD(, kse) zombie_kses = TAILQ_HEAD_INITIALIZER(zombie_kses); 92105854SjulianTAILQ_HEAD(, ksegrp) zombie_ksegrps = TAILQ_HEAD_INITIALIZER(zombie_ksegrps); 93111028SjeffTAILQ_HEAD(, kse_upcall) zombie_upcalls = 94111028Sjeff TAILQ_HEAD_INITIALIZER(zombie_upcalls); 95111028Sjeffstruct mtx kse_zombie_lock; 96111028SjeffMTX_SYSINIT(kse_zombie_lock, &kse_zombie_lock, "kse zombie lock", MTX_SPIN); 9799026Sjulian 98107719Sjulianstatic void kse_purge(struct proc *p, struct thread *td); 99111028Sjeffstatic void kse_purge_group(struct thread *td); 100111028Sjeffstatic int thread_update_usr_ticks(struct thread *td); 101111028Sjeffstatic int thread_update_sys_ticks(struct thread *td); 102111028Sjeffstatic void thread_alloc_spare(struct thread *td, struct thread *spare); 103105854Sjulian 104111028Sjeffstatic int 105111028Sjeffsysctl_kse_virtual_cpu(SYSCTL_HANDLER_ARGS) 106111028Sjeff{ 107111028Sjeff int error, new_val; 108111028Sjeff int def_val; 109111028Sjeff 110111028Sjeff#ifdef SMP 111111028Sjeff def_val = mp_ncpus; 112111028Sjeff#else 113111028Sjeff def_val = 1; 114111028Sjeff#endif 115111028Sjeff if (virtual_cpu == 0) 116111028Sjeff new_val = def_val; 117111028Sjeff else 118111028Sjeff new_val = virtual_cpu; 119111028Sjeff error = sysctl_handle_int(oidp, &new_val, 0, req); 120111028Sjeff if (error != 0 || req->newptr == NULL) 121111028Sjeff return (error); 122111028Sjeff if (new_val < 0) 123111028Sjeff return (EINVAL); 124111028Sjeff virtual_cpu = new_val; 125111028Sjeff return (0); 126111028Sjeff} 127111028Sjeff 128111028Sjeff/* DEBUG ONLY */ 129111028SjeffSYSCTL_PROC(_kern_threads, OID_AUTO, virtual_cpu, CTLTYPE_INT|CTLFLAG_RW, 130111028Sjeff 0, sizeof(virtual_cpu), sysctl_kse_virtual_cpu, "I", 131111028Sjeff "debug virtual cpus"); 132111028Sjeff 13399026Sjulian/* 134107719Sjulian * Prepare a thread for use. 13599026Sjulian */ 13699026Sjulianstatic void 13799026Sjulianthread_ctor(void *mem, int size, void *arg) 13899026Sjulian{ 13999026Sjulian struct thread *td; 14099026Sjulian 14199026Sjulian td = (struct thread *)mem; 142103216Sjulian td->td_state = TDS_INACTIVE; 14399026Sjulian} 14499026Sjulian 14599026Sjulian/* 14699026Sjulian * Reclaim a thread after use. 14799026Sjulian */ 14899026Sjulianstatic void 14999026Sjulianthread_dtor(void *mem, int size, void *arg) 15099026Sjulian{ 15199026Sjulian struct thread *td; 15299026Sjulian 15399026Sjulian td = (struct thread *)mem; 15499026Sjulian 15599026Sjulian#ifdef INVARIANTS 15699026Sjulian /* Verify that this thread is in a safe state to free. */ 15799026Sjulian switch (td->td_state) { 158103216Sjulian case TDS_INHIBITED: 159103216Sjulian case TDS_RUNNING: 160103216Sjulian case TDS_CAN_RUN: 16199026Sjulian case TDS_RUNQ: 16299026Sjulian /* 16399026Sjulian * We must never unlink a thread that is in one of 16499026Sjulian * these states, because it is currently active. 16599026Sjulian */ 16699026Sjulian panic("bad state for thread unlinking"); 16799026Sjulian /* NOTREACHED */ 168103216Sjulian case TDS_INACTIVE: 16999026Sjulian break; 17099026Sjulian default: 17199026Sjulian panic("bad thread state"); 17299026Sjulian /* NOTREACHED */ 17399026Sjulian } 17499026Sjulian#endif 17599026Sjulian} 17699026Sjulian 17799026Sjulian/* 17899026Sjulian * Initialize type-stable parts of a thread (when newly created). 17999026Sjulian */ 18099026Sjulianstatic void 18199026Sjulianthread_init(void *mem, int size) 18299026Sjulian{ 18399026Sjulian struct thread *td; 18499026Sjulian 18599026Sjulian td = (struct thread *)mem; 186103312Sjulian mtx_lock(&Giant); 187104354Sscottl pmap_new_thread(td, 0); 188103312Sjulian mtx_unlock(&Giant); 18999026Sjulian cpu_thread_setup(td); 190107126Sjeff td->td_sched = (struct td_sched *)&td[1]; 19199026Sjulian} 19299026Sjulian 19399026Sjulian/* 19499026Sjulian * Tear down type-stable parts of a thread (just before being discarded). 19599026Sjulian */ 19699026Sjulianstatic void 19799026Sjulianthread_fini(void *mem, int size) 19899026Sjulian{ 19999026Sjulian struct thread *td; 20099026Sjulian 20199026Sjulian td = (struct thread *)mem; 20299026Sjulian pmap_dispose_thread(td); 20399026Sjulian} 204111028Sjeff 205107126Sjeff/* 206107126Sjeff * Initialize type-stable parts of a kse (when newly created). 207107126Sjeff */ 208107126Sjeffstatic void 209107126Sjeffkse_init(void *mem, int size) 210107126Sjeff{ 211107126Sjeff struct kse *ke; 21299026Sjulian 213107126Sjeff ke = (struct kse *)mem; 214107126Sjeff ke->ke_sched = (struct ke_sched *)&ke[1]; 215107126Sjeff} 216111028Sjeff 217107126Sjeff/* 218107126Sjeff * Initialize type-stable parts of a ksegrp (when newly created). 219107126Sjeff */ 220107126Sjeffstatic void 221107126Sjeffksegrp_init(void *mem, int size) 222107126Sjeff{ 223107126Sjeff struct ksegrp *kg; 224107126Sjeff 225107126Sjeff kg = (struct ksegrp *)mem; 226107126Sjeff kg->kg_sched = (struct kg_sched *)&kg[1]; 227107126Sjeff} 228107126Sjeff 229105854Sjulian/* 230111028Sjeff * KSE is linked into kse group. 231105854Sjulian */ 232105854Sjulianvoid 233105854Sjuliankse_link(struct kse *ke, struct ksegrp *kg) 234105854Sjulian{ 235105854Sjulian struct proc *p = kg->kg_proc; 236105854Sjulian 237105854Sjulian TAILQ_INSERT_HEAD(&kg->kg_kseq, ke, ke_kglist); 238105854Sjulian kg->kg_kses++; 239111028Sjeff ke->ke_state = KES_UNQUEUED; 240105854Sjulian ke->ke_proc = p; 241105854Sjulian ke->ke_ksegrp = kg; 242105854Sjulian ke->ke_thread = NULL; 243111028Sjeff ke->ke_oncpu = NOCPU; 244111028Sjeff ke->ke_flags = 0; 245105854Sjulian} 246105854Sjulian 247105854Sjulianvoid 248105854Sjuliankse_unlink(struct kse *ke) 249105854Sjulian{ 250105854Sjulian struct ksegrp *kg; 251105854Sjulian 252105854Sjulian mtx_assert(&sched_lock, MA_OWNED); 253105854Sjulian kg = ke->ke_ksegrp; 254105854Sjulian TAILQ_REMOVE(&kg->kg_kseq, ke, ke_kglist); 255111028Sjeff if (ke->ke_state == KES_IDLE) { 256111028Sjeff TAILQ_REMOVE(&kg->kg_iq, ke, ke_kgrlist); 257111028Sjeff kg->kg_idle_kses--; 258105854Sjulian } 259111028Sjeff if (--kg->kg_kses == 0) 260111028Sjeff ksegrp_unlink(kg); 261105854Sjulian /* 262105854Sjulian * Aggregate stats from the KSE 263105854Sjulian */ 264105854Sjulian kse_stash(ke); 265105854Sjulian} 266105854Sjulian 267105854Sjulianvoid 268105854Sjulianksegrp_link(struct ksegrp *kg, struct proc *p) 269105854Sjulian{ 270105854Sjulian 271105854Sjulian TAILQ_INIT(&kg->kg_threads); 272105854Sjulian TAILQ_INIT(&kg->kg_runq); /* links with td_runq */ 273105854Sjulian TAILQ_INIT(&kg->kg_slpq); /* links with td_runq */ 274105854Sjulian TAILQ_INIT(&kg->kg_kseq); /* all kses in ksegrp */ 275111028Sjeff TAILQ_INIT(&kg->kg_iq); /* all idle kses in ksegrp */ 276111028Sjeff TAILQ_INIT(&kg->kg_upcalls); /* all upcall structure in ksegrp */ 277111028Sjeff kg->kg_proc = p; 278111028Sjeff /* 279111028Sjeff * the following counters are in the -zero- section 280111028Sjeff * and may not need clearing 281111028Sjeff */ 282105854Sjulian kg->kg_numthreads = 0; 283111028Sjeff kg->kg_runnable = 0; 284111028Sjeff kg->kg_kses = 0; 285111028Sjeff kg->kg_runq_kses = 0; /* XXXKSE change name */ 286111028Sjeff kg->kg_idle_kses = 0; 287111028Sjeff kg->kg_numupcalls = 0; 288111028Sjeff /* link it in now that it's consistent */ 289105854Sjulian p->p_numksegrps++; 290105854Sjulian TAILQ_INSERT_HEAD(&p->p_ksegrps, kg, kg_ksegrp); 291105854Sjulian} 292105854Sjulian 293105854Sjulianvoid 294105854Sjulianksegrp_unlink(struct ksegrp *kg) 295105854Sjulian{ 296105854Sjulian struct proc *p; 297105854Sjulian 298105854Sjulian mtx_assert(&sched_lock, MA_OWNED); 299111028Sjeff KASSERT((kg->kg_numthreads == 0), ("ksegrp_unlink: residual threads")); 300111028Sjeff KASSERT((kg->kg_kses == 0), ("ksegrp_unlink: residual kses")); 301111028Sjeff KASSERT((kg->kg_numupcalls == 0), ("ksegrp_unlink: residual upcalls")); 302111028Sjeff 303105854Sjulian p = kg->kg_proc; 304105854Sjulian TAILQ_REMOVE(&p->p_ksegrps, kg, kg_ksegrp); 305105854Sjulian p->p_numksegrps--; 306105854Sjulian /* 307105854Sjulian * Aggregate stats from the KSE 308105854Sjulian */ 309105854Sjulian ksegrp_stash(kg); 310105854Sjulian} 311105854Sjulian 312111028Sjeffstruct kse_upcall * 313111028Sjeffupcall_alloc(void) 314111028Sjeff{ 315111028Sjeff struct kse_upcall *ku; 316111028Sjeff 317111125Sdavidxu ku = uma_zalloc(upcall_zone, M_WAITOK); 318111028Sjeff bzero(ku, sizeof(*ku)); 319111028Sjeff return (ku); 320111028Sjeff} 321111028Sjeff 322111028Sjeffvoid 323111028Sjeffupcall_free(struct kse_upcall *ku) 324111028Sjeff{ 325111028Sjeff 326111028Sjeff uma_zfree(upcall_zone, ku); 327111028Sjeff} 328111028Sjeff 329111028Sjeffvoid 330111028Sjeffupcall_link(struct kse_upcall *ku, struct ksegrp *kg) 331111028Sjeff{ 332111028Sjeff 333111028Sjeff mtx_assert(&sched_lock, MA_OWNED); 334111028Sjeff TAILQ_INSERT_TAIL(&kg->kg_upcalls, ku, ku_link); 335111028Sjeff ku->ku_ksegrp = kg; 336111028Sjeff kg->kg_numupcalls++; 337111028Sjeff} 338111028Sjeff 339111028Sjeffvoid 340111028Sjeffupcall_unlink(struct kse_upcall *ku) 341111028Sjeff{ 342111028Sjeff struct ksegrp *kg = ku->ku_ksegrp; 343111028Sjeff 344111028Sjeff mtx_assert(&sched_lock, MA_OWNED); 345111028Sjeff KASSERT(ku->ku_owner == NULL, ("%s: have owner", __func__)); 346111028Sjeff TAILQ_REMOVE(&kg->kg_upcalls, ku, ku_link); 347111028Sjeff kg->kg_numupcalls--; 348111028Sjeff upcall_stash(ku); 349111028Sjeff} 350111028Sjeff 351111028Sjeffvoid 352111028Sjeffupcall_remove(struct thread *td) 353111028Sjeff{ 354111028Sjeff 355111028Sjeff if (td->td_upcall) { 356111028Sjeff td->td_upcall->ku_owner = NULL; 357111028Sjeff upcall_unlink(td->td_upcall); 358111028Sjeff td->td_upcall = 0; 359111028Sjeff } 360111028Sjeff} 361111028Sjeff 36299026Sjulian/* 363111028Sjeff * For a newly created process, 364111028Sjeff * link up all the structures and its initial threads etc. 365105854Sjulian */ 366105854Sjulianvoid 367105854Sjulianproc_linkup(struct proc *p, struct ksegrp *kg, 368111028Sjeff struct kse *ke, struct thread *td) 369105854Sjulian{ 370105854Sjulian 371105854Sjulian TAILQ_INIT(&p->p_ksegrps); /* all ksegrps in proc */ 372105854Sjulian TAILQ_INIT(&p->p_threads); /* all threads in proc */ 373105854Sjulian TAILQ_INIT(&p->p_suspended); /* Threads suspended */ 374105854Sjulian p->p_numksegrps = 0; 375105854Sjulian p->p_numthreads = 0; 376105854Sjulian 377105854Sjulian ksegrp_link(kg, p); 378105854Sjulian kse_link(ke, kg); 379105854Sjulian thread_link(td, kg); 380105854Sjulian} 381105854Sjulian 382111028Sjeff/* 383111028Sjeffstruct kse_thr_interrupt_args { 384111028Sjeff struct kse_thr_mailbox * tmbx; 385111028Sjeff}; 386111028Sjeff*/ 387105854Sjulianint 388105854Sjuliankse_thr_interrupt(struct thread *td, struct kse_thr_interrupt_args *uap) 389105854Sjulian{ 390106180Sdavidxu struct proc *p; 391106180Sdavidxu struct thread *td2; 392105854Sjulian 393106242Sdavidxu p = td->td_proc; 394111028Sjeff if (!(p->p_flag & P_KSES) || (uap->tmbx == NULL)) 395106242Sdavidxu return (EINVAL); 396106180Sdavidxu mtx_lock_spin(&sched_lock); 397106180Sdavidxu FOREACH_THREAD_IN_PROC(p, td2) { 398106180Sdavidxu if (td2->td_mailbox == uap->tmbx) { 399106180Sdavidxu td2->td_flags |= TDF_INTERRUPT; 400106180Sdavidxu if (TD_ON_SLEEPQ(td2) && (td2->td_flags & TDF_SINTR)) { 401106180Sdavidxu if (td2->td_flags & TDF_CVWAITQ) 402106180Sdavidxu cv_abort(td2); 403106180Sdavidxu else 404106180Sdavidxu abortsleep(td2); 405111028Sjeff } 406106180Sdavidxu mtx_unlock_spin(&sched_lock); 407106182Sdavidxu return (0); 408106180Sdavidxu } 409106180Sdavidxu } 410106180Sdavidxu mtx_unlock_spin(&sched_lock); 411106182Sdavidxu return (ESRCH); 412105854Sjulian} 413105854Sjulian 414111028Sjeff/* 415111028Sjeffstruct kse_exit_args { 416111028Sjeff register_t dummy; 417111028Sjeff}; 418111028Sjeff*/ 419105854Sjulianint 420105854Sjuliankse_exit(struct thread *td, struct kse_exit_args *uap) 421105854Sjulian{ 422105854Sjulian struct proc *p; 423105854Sjulian struct ksegrp *kg; 424108640Sdavidxu struct kse *ke; 425105854Sjulian 426105854Sjulian p = td->td_proc; 427111028Sjeff /* 428111028Sjeff * Only UTS can call the syscall and current group 429111028Sjeff * should be a threaded group. 430111028Sjeff */ 431111028Sjeff if ((td->td_mailbox != NULL) || (td->td_ksegrp->kg_numupcalls == 0)) 432106182Sdavidxu return (EINVAL); 433111028Sjeff KASSERT((td->td_upcall != NULL), ("%s: not own an upcall", __func__)); 434111028Sjeff 435105854Sjulian kg = td->td_ksegrp; 436111028Sjeff /* Serialize removing upcall */ 437105854Sjulian PROC_LOCK(p); 438105854Sjulian mtx_lock_spin(&sched_lock); 439111028Sjeff if ((kg->kg_numupcalls == 1) && (kg->kg_numthreads > 1)) { 440105854Sjulian mtx_unlock_spin(&sched_lock); 441105854Sjulian PROC_UNLOCK(p); 442105854Sjulian return (EDEADLK); 443105854Sjulian } 444108640Sdavidxu ke = td->td_kse; 445111028Sjeff upcall_remove(td); 446108640Sdavidxu if (p->p_numthreads == 1) { 447111028Sjeff kse_purge(p, td); 448105854Sjulian p->p_flag &= ~P_KSES; 449105854Sjulian mtx_unlock_spin(&sched_lock); 450105854Sjulian PROC_UNLOCK(p); 451105854Sjulian } else { 452111028Sjeff if (kg->kg_numthreads == 1) { /* Shutdown a group */ 453111028Sjeff kse_purge_group(td); 454111028Sjeff ke->ke_flags |= KEF_EXIT; 455111028Sjeff } 456105854Sjulian thread_exit(); 457105854Sjulian /* NOTREACHED */ 458105854Sjulian } 459106182Sdavidxu return (0); 460105854Sjulian} 461105854Sjulian 462107719Sjulian/* 463108338Sjulian * Either becomes an upcall or waits for an awakening event and 464111028Sjeff * then becomes an upcall. Only error cases return. 465107719Sjulian */ 466111028Sjeff/* 467111028Sjeffstruct kse_release_args { 468111169Sdavidxu struct timespec *timeout; 469111028Sjeff}; 470111028Sjeff*/ 471105854Sjulianint 472111028Sjeffkse_release(struct thread *td, struct kse_release_args *uap) 473105854Sjulian{ 474105854Sjulian struct proc *p; 475107719Sjulian struct ksegrp *kg; 476111169Sdavidxu struct timespec ts, ts2, ts3, timeout; 477111169Sdavidxu struct timeval tv; 478111169Sdavidxu int error; 479105854Sjulian 480105854Sjulian p = td->td_proc; 481107719Sjulian kg = td->td_ksegrp; 482106903Sdavidxu /* 483111028Sjeff * Only UTS can call the syscall and current group 484111028Sjeff * should be a threaded group. 485111028Sjeff */ 486111028Sjeff if ((td->td_mailbox != NULL) || (td->td_ksegrp->kg_numupcalls == 0)) 487107719Sjulian return (EINVAL); 488111028Sjeff KASSERT((td->td_upcall != NULL), ("%s: not own an upcall", __func__)); 489111169Sdavidxu if (uap->timeout != NULL) { 490111169Sdavidxu if ((error = copyin(uap->timeout, &timeout, sizeof(timeout)))) 491111169Sdavidxu return (error); 492111169Sdavidxu getnanouptime(&ts); 493111169Sdavidxu timespecadd(&ts, &timeout); 494111169Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &timeout); 495111169Sdavidxu } 496108613Sjulian mtx_lock_spin(&sched_lock); 497108338Sjulian /* Change OURSELF to become an upcall. */ 498111028Sjeff td->td_flags = TDF_UPCALLING; 499111042Sdavidxu if (p->p_sflag & PS_NEEDSIGCHK) 500111042Sdavidxu td->td_flags |= TDF_ASTPENDING; 501111169Sdavidxu mtx_unlock_spin(&sched_lock); 502111169Sdavidxu PROC_LOCK(p); 503111169Sdavidxu while ((td->td_upcall->ku_flags & KUF_DOUPCALL) == 0 && 504111169Sdavidxu (kg->kg_completed == NULL)) { 505111028Sjeff kg->kg_upsleeps++; 506111169Sdavidxu error = msleep(&kg->kg_completed, &p->p_mtx, PPAUSE|PCATCH, 507111169Sdavidxu "kse_rel", (uap->timeout ? tvtohz(&tv) : 0)); 508111028Sjeff kg->kg_upsleeps--; 509110190Sjulian PROC_UNLOCK(p); 510111169Sdavidxu if (uap->timeout == NULL || error != EWOULDBLOCK) 511111169Sdavidxu return (0); 512111169Sdavidxu getnanouptime(&ts2); 513111169Sdavidxu if (timespeccmp(&ts2, &ts, >=)) 514111169Sdavidxu return (0); 515111169Sdavidxu ts3 = ts; 516111169Sdavidxu timespecsub(&ts3, &ts2); 517111169Sdavidxu TIMESPEC_TO_TIMEVAL(&tv, &ts3); 518111169Sdavidxu PROC_LOCK(p); 519105854Sjulian } 520111169Sdavidxu PROC_UNLOCK(p); 521107719Sjulian return (0); 522105854Sjulian} 523105854Sjulian 524105854Sjulian/* struct kse_wakeup_args { 525105854Sjulian struct kse_mailbox *mbx; 526105854Sjulian}; */ 527105854Sjulianint 528105854Sjuliankse_wakeup(struct thread *td, struct kse_wakeup_args *uap) 529105854Sjulian{ 530105854Sjulian struct proc *p; 531105854Sjulian struct ksegrp *kg; 532111028Sjeff struct kse_upcall *ku; 533108338Sjulian struct thread *td2; 534105854Sjulian 535105854Sjulian p = td->td_proc; 536108338Sjulian td2 = NULL; 537111028Sjeff ku = NULL; 538105854Sjulian /* KSE-enabled processes only, please. */ 539105854Sjulian if (!(p->p_flag & P_KSES)) 540111028Sjeff return (EINVAL); 541111207Sdavidxu if ((td->td_ksegrp->kg_numupcalls != 0) && (td->td_mailbox == NULL)) { 542111207Sdavidxu KASSERT((td->td_upcall != NULL), ("%s: not own an upcall", __func__)); 543111207Sdavidxu if (td->td_upcall->ku_mailbox == uap->mbx) 544111207Sdavidxu return (0); 545111207Sdavidxu } 546111028Sjeff PROC_LOCK(p); 547108613Sjulian mtx_lock_spin(&sched_lock); 548105854Sjulian if (uap->mbx) { 549105854Sjulian FOREACH_KSEGRP_IN_PROC(p, kg) { 550111028Sjeff FOREACH_UPCALL_IN_GROUP(kg, ku) { 551111207Sdavidxu if (ku->ku_mailbox == uap->mbx) 552111028Sjeff break; 553108613Sjulian } 554111028Sjeff if (ku) 555108338Sjulian break; 556105854Sjulian } 557105854Sjulian } else { 558105854Sjulian kg = td->td_ksegrp; 559111028Sjeff if (kg->kg_upsleeps) { 560111028Sjeff wakeup_one(&kg->kg_completed); 561111028Sjeff mtx_unlock_spin(&sched_lock); 562111028Sjeff PROC_UNLOCK(p); 563111028Sjeff return (0); 564108338Sjulian } 565111028Sjeff ku = TAILQ_FIRST(&kg->kg_upcalls); 566105854Sjulian } 567111028Sjeff if (ku) { 568111028Sjeff if ((td2 = ku->ku_owner) == NULL) { 569111028Sjeff panic("%s: no owner", __func__); 570111028Sjeff } else if (TD_ON_SLEEPQ(td2) && 571111028Sjeff (td2->td_wchan == &kg->kg_completed)) { 572111028Sjeff abortsleep(td2); 573111028Sjeff } else { 574111028Sjeff ku->ku_flags |= KUF_DOUPCALL; 575108613Sjulian } 576105854Sjulian mtx_unlock_spin(&sched_lock); 577111028Sjeff PROC_UNLOCK(p); 578108338Sjulian return (0); 579108613Sjulian } 580105854Sjulian mtx_unlock_spin(&sched_lock); 581111028Sjeff PROC_UNLOCK(p); 582108338Sjulian return (ESRCH); 583105854Sjulian} 584105854Sjulian 585105854Sjulian/* 586105854Sjulian * No new KSEG: first call: use current KSE, don't schedule an upcall 587111028Sjeff * All other situations, do allocate max new KSEs and schedule an upcall. 588105854Sjulian */ 589105854Sjulian/* struct kse_create_args { 590105854Sjulian struct kse_mailbox *mbx; 591105854Sjulian int newgroup; 592105854Sjulian}; */ 593105854Sjulianint 594105854Sjuliankse_create(struct thread *td, struct kse_create_args *uap) 595105854Sjulian{ 596105854Sjulian struct kse *newke; 597105854Sjulian struct ksegrp *newkg; 598105854Sjulian struct ksegrp *kg; 599105854Sjulian struct proc *p; 600105854Sjulian struct kse_mailbox mbx; 601111028Sjeff struct kse_upcall *newku; 602111028Sjeff int err, ncpus; 603105854Sjulian 604105854Sjulian p = td->td_proc; 605105854Sjulian if ((err = copyin(uap->mbx, &mbx, sizeof(mbx)))) 606105854Sjulian return (err); 607105854Sjulian 608111028Sjeff /* Too bad, why hasn't kernel always a cpu counter !? */ 609111028Sjeff#ifdef SMP 610111028Sjeff ncpus = mp_ncpus; 611111028Sjeff#else 612111028Sjeff ncpus = 1; 613111028Sjeff#endif 614111028Sjeff if (thread_debug && virtual_cpu != 0) 615111028Sjeff ncpus = virtual_cpu; 616111028Sjeff 617111028Sjeff /* Easier to just set it than to test and set */ 618111028Sjeff p->p_flag |= P_KSES; 619105854Sjulian kg = td->td_ksegrp; 620105854Sjulian if (uap->newgroup) { 621111028Sjeff /* Have race condition but it is cheap */ 622107006Sdavidxu if (p->p_numksegrps >= max_groups_per_proc) 623107006Sdavidxu return (EPROCLIM); 624105854Sjulian /* 625105854Sjulian * If we want a new KSEGRP it doesn't matter whether 626105854Sjulian * we have already fired up KSE mode before or not. 627111028Sjeff * We put the process in KSE mode and create a new KSEGRP. 628105854Sjulian */ 629105854Sjulian newkg = ksegrp_alloc(); 630105854Sjulian bzero(&newkg->kg_startzero, RANGEOF(struct ksegrp, 631111028Sjeff kg_startzero, kg_endzero)); 632105854Sjulian bcopy(&kg->kg_startcopy, &newkg->kg_startcopy, 633105854Sjulian RANGEOF(struct ksegrp, kg_startcopy, kg_endcopy)); 634111028Sjeff mtx_lock_spin(&sched_lock); 635111028Sjeff ksegrp_link(newkg, p); 636111028Sjeff if (p->p_numksegrps >= max_groups_per_proc) { 637111028Sjeff ksegrp_unlink(newkg); 638111028Sjeff mtx_unlock_spin(&sched_lock); 639111028Sjeff return (EPROCLIM); 640111028Sjeff } 641111028Sjeff mtx_unlock_spin(&sched_lock); 642105854Sjulian } else { 643111028Sjeff newkg = kg; 644111028Sjeff } 645111028Sjeff 646111028Sjeff /* 647111028Sjeff * Creating upcalls more than number of physical cpu does 648111028Sjeff * not help performance. 649111028Sjeff */ 650111028Sjeff if (newkg->kg_numupcalls >= ncpus) 651111028Sjeff return (EPROCLIM); 652111028Sjeff 653111028Sjeff if (newkg->kg_numupcalls == 0) { 654111028Sjeff /* 655111028Sjeff * Initialize KSE group, optimized for MP. 656111028Sjeff * Create KSEs as many as physical cpus, this increases 657111028Sjeff * concurrent even if userland is not MP safe and can only run 658111028Sjeff * on single CPU (for early version of libpthread, it is true). 659111028Sjeff * In ideal world, every physical cpu should execute a thread. 660111028Sjeff * If there is enough KSEs, threads in kernel can be 661111028Sjeff * executed parallel on different cpus with full speed, 662111028Sjeff * Concurrent in kernel shouldn't be restricted by number of 663111028Sjeff * upcalls userland provides. 664111028Sjeff * Adding more upcall structures only increases concurrent 665111028Sjeff * in userland. 666111028Sjeff * Highest performance configuration is: 667111028Sjeff * N kses = N upcalls = N phyiscal cpus 668105854Sjulian */ 669111028Sjeff while (newkg->kg_kses < ncpus) { 670105854Sjulian newke = kse_alloc(); 671111028Sjeff bzero(&newke->ke_startzero, RANGEOF(struct kse, 672111028Sjeff ke_startzero, ke_endzero)); 673105854Sjulian#if 0 674111028Sjeff mtx_lock_spin(&sched_lock); 675111028Sjeff bcopy(&ke->ke_startcopy, &newke->ke_startcopy, 676111028Sjeff RANGEOF(struct kse, ke_startcopy, ke_endcopy)); 677111028Sjeff mtx_unlock_spin(&sched_lock); 678105854Sjulian#endif 679111028Sjeff mtx_lock_spin(&sched_lock); 680111028Sjeff kse_link(newke, newkg); 681111028Sjeff /* Add engine */ 682111028Sjeff kse_reassign(newke); 683111028Sjeff mtx_unlock_spin(&sched_lock); 684105854Sjulian } 685111028Sjeff } 686111028Sjeff newku = upcall_alloc(); 687111028Sjeff newku->ku_mailbox = uap->mbx; 688111028Sjeff newku->ku_func = mbx.km_func; 689111028Sjeff bcopy(&mbx.km_stack, &newku->ku_stack, sizeof(stack_t)); 690111028Sjeff 691111028Sjeff /* For the first call this may not have been set */ 692111028Sjeff if (td->td_standin == NULL) 693111028Sjeff thread_alloc_spare(td, NULL); 694111028Sjeff 695111028Sjeff mtx_lock_spin(&sched_lock); 696111028Sjeff if (newkg->kg_numupcalls >= ncpus) { 697111028Sjeff upcall_free(newku); 698105854Sjulian mtx_unlock_spin(&sched_lock); 699111028Sjeff return (EPROCLIM); 700111028Sjeff } 701111028Sjeff upcall_link(newku, newkg); 702111028Sjeff 703111028Sjeff /* 704111028Sjeff * Each upcall structure has an owner thread, find which 705111028Sjeff * one owns it. 706111028Sjeff */ 707111028Sjeff if (uap->newgroup) { 708111028Sjeff /* 709111028Sjeff * Because new ksegrp hasn't thread, 710111028Sjeff * create an initial upcall thread to own it. 711111028Sjeff */ 712111028Sjeff thread_schedule_upcall(td, newku); 713105854Sjulian } else { 714105854Sjulian /* 715111028Sjeff * If current thread hasn't an upcall structure, 716111028Sjeff * just assign the upcall to it. 717105854Sjulian */ 718111028Sjeff if (td->td_upcall == NULL) { 719111028Sjeff newku->ku_owner = td; 720111028Sjeff td->td_upcall = newku; 721111028Sjeff } else { 722111028Sjeff /* 723111028Sjeff * Create a new upcall thread to own it. 724111028Sjeff */ 725111028Sjeff thread_schedule_upcall(td, newku); 726111028Sjeff } 727105854Sjulian } 728111028Sjeff mtx_unlock_spin(&sched_lock); 729105854Sjulian return (0); 730105854Sjulian} 731105854Sjulian 732105854Sjulian/* 733103410Smini * Fill a ucontext_t with a thread's context information. 734103410Smini * 735103410Smini * This is an analogue to getcontext(3). 736103410Smini */ 737103410Sminivoid 738103410Sminithread_getcontext(struct thread *td, ucontext_t *uc) 739103410Smini{ 740103410Smini 741103464Speter/* 742103464Speter * XXX this is declared in a MD include file, i386/include/ucontext.h but 743103464Speter * is used in MI code. 744103464Speter */ 745103463Speter#ifdef __i386__ 746103410Smini get_mcontext(td, &uc->uc_mcontext); 747103463Speter#endif 748103410Smini uc->uc_sigmask = td->td_proc->p_sigmask; 749103410Smini} 750103410Smini 751103410Smini/* 752103410Smini * Set a thread's context from a ucontext_t. 753103410Smini * 754103410Smini * This is an analogue to setcontext(3). 755103410Smini */ 756103410Sminiint 757103410Sminithread_setcontext(struct thread *td, ucontext_t *uc) 758103410Smini{ 759103410Smini int ret; 760103410Smini 761103464Speter/* 762103464Speter * XXX this is declared in a MD include file, i386/include/ucontext.h but 763103464Speter * is used in MI code. 764103464Speter */ 765103463Speter#ifdef __i386__ 766103410Smini ret = set_mcontext(td, &uc->uc_mcontext); 767103463Speter#else 768103463Speter ret = ENOSYS; 769103463Speter#endif 770103410Smini if (ret == 0) { 771103410Smini SIG_CANTMASK(uc->uc_sigmask); 772103410Smini PROC_LOCK(td->td_proc); 773103410Smini td->td_proc->p_sigmask = uc->uc_sigmask; 774103410Smini PROC_UNLOCK(td->td_proc); 775103410Smini } 776103410Smini return (ret); 777103410Smini} 778103410Smini 779103410Smini/* 78099026Sjulian * Initialize global thread allocation resources. 78199026Sjulian */ 78299026Sjulianvoid 78399026Sjulianthreadinit(void) 78499026Sjulian{ 78599026Sjulian 786104437Speter#ifndef __ia64__ 787107126Sjeff thread_zone = uma_zcreate("THREAD", sched_sizeof_thread(), 78899026Sjulian thread_ctor, thread_dtor, thread_init, thread_fini, 78999026Sjulian UMA_ALIGN_CACHE, 0); 790104437Speter#else 791104437Speter /* 792104437Speter * XXX the ia64 kstack allocator is really lame and is at the mercy 793104437Speter * of contigmallloc(). This hackery is to pre-construct a whole 794104437Speter * pile of thread structures with associated kernel stacks early 795104437Speter * in the system startup while contigmalloc() still works. Once we 796104437Speter * have them, keep them. Sigh. 797104437Speter */ 798107126Sjeff thread_zone = uma_zcreate("THREAD", sched_sizeof_thread(), 799104437Speter thread_ctor, thread_dtor, thread_init, thread_fini, 800104437Speter UMA_ALIGN_CACHE, UMA_ZONE_NOFREE); 801104437Speter uma_prealloc(thread_zone, 512); /* XXX arbitary */ 802104437Speter#endif 803107126Sjeff ksegrp_zone = uma_zcreate("KSEGRP", sched_sizeof_ksegrp(), 804107126Sjeff NULL, NULL, ksegrp_init, NULL, 805103367Sjulian UMA_ALIGN_CACHE, 0); 806107126Sjeff kse_zone = uma_zcreate("KSE", sched_sizeof_kse(), 807107126Sjeff NULL, NULL, kse_init, NULL, 808103367Sjulian UMA_ALIGN_CACHE, 0); 809111028Sjeff upcall_zone = uma_zcreate("UPCALL", sizeof(struct kse_upcall), 810111028Sjeff NULL, NULL, NULL, NULL, UMA_ALIGN_CACHE, 0); 81199026Sjulian} 81299026Sjulian 81399026Sjulian/* 814103002Sjulian * Stash an embarasingly extra thread into the zombie thread queue. 81599026Sjulian */ 81699026Sjulianvoid 81799026Sjulianthread_stash(struct thread *td) 81899026Sjulian{ 819111028Sjeff mtx_lock_spin(&kse_zombie_lock); 82099026Sjulian TAILQ_INSERT_HEAD(&zombie_threads, td, td_runq); 821111028Sjeff mtx_unlock_spin(&kse_zombie_lock); 82299026Sjulian} 82399026Sjulian 824103410Smini/* 825105854Sjulian * Stash an embarasingly extra kse into the zombie kse queue. 826105854Sjulian */ 827105854Sjulianvoid 828105854Sjuliankse_stash(struct kse *ke) 829105854Sjulian{ 830111028Sjeff mtx_lock_spin(&kse_zombie_lock); 831105854Sjulian TAILQ_INSERT_HEAD(&zombie_kses, ke, ke_procq); 832111028Sjeff mtx_unlock_spin(&kse_zombie_lock); 833105854Sjulian} 834105854Sjulian 835105854Sjulian/* 836111028Sjeff * Stash an embarasingly extra upcall into the zombie upcall queue. 837111028Sjeff */ 838111028Sjeff 839111028Sjeffvoid 840111028Sjeffupcall_stash(struct kse_upcall *ku) 841111028Sjeff{ 842111028Sjeff mtx_lock_spin(&kse_zombie_lock); 843111028Sjeff TAILQ_INSERT_HEAD(&zombie_upcalls, ku, ku_link); 844111028Sjeff mtx_unlock_spin(&kse_zombie_lock); 845111028Sjeff} 846111028Sjeff 847111028Sjeff/* 848105854Sjulian * Stash an embarasingly extra ksegrp into the zombie ksegrp queue. 849105854Sjulian */ 850105854Sjulianvoid 851105854Sjulianksegrp_stash(struct ksegrp *kg) 852105854Sjulian{ 853111028Sjeff mtx_lock_spin(&kse_zombie_lock); 854105854Sjulian TAILQ_INSERT_HEAD(&zombie_ksegrps, kg, kg_ksegrp); 855111028Sjeff mtx_unlock_spin(&kse_zombie_lock); 856105854Sjulian} 857105854Sjulian 858105854Sjulian/* 859111028Sjeff * Reap zombie kse resource. 86099026Sjulian */ 86199026Sjulianvoid 86299026Sjulianthread_reap(void) 86399026Sjulian{ 864105854Sjulian struct thread *td_first, *td_next; 865105854Sjulian struct kse *ke_first, *ke_next; 866105854Sjulian struct ksegrp *kg_first, * kg_next; 867111028Sjeff struct kse_upcall *ku_first, *ku_next; 86899026Sjulian 86999026Sjulian /* 870111028Sjeff * Don't even bother to lock if none at this instant, 871111028Sjeff * we really don't care about the next instant.. 87299026Sjulian */ 873105854Sjulian if ((!TAILQ_EMPTY(&zombie_threads)) 874105854Sjulian || (!TAILQ_EMPTY(&zombie_kses)) 875111028Sjeff || (!TAILQ_EMPTY(&zombie_ksegrps)) 876111028Sjeff || (!TAILQ_EMPTY(&zombie_upcalls))) { 877111028Sjeff mtx_lock_spin(&kse_zombie_lock); 878105854Sjulian td_first = TAILQ_FIRST(&zombie_threads); 879105854Sjulian ke_first = TAILQ_FIRST(&zombie_kses); 880105854Sjulian kg_first = TAILQ_FIRST(&zombie_ksegrps); 881111028Sjeff ku_first = TAILQ_FIRST(&zombie_upcalls); 882105854Sjulian if (td_first) 883105854Sjulian TAILQ_INIT(&zombie_threads); 884105854Sjulian if (ke_first) 885105854Sjulian TAILQ_INIT(&zombie_kses); 886105854Sjulian if (kg_first) 887105854Sjulian TAILQ_INIT(&zombie_ksegrps); 888111028Sjeff if (ku_first) 889111028Sjeff TAILQ_INIT(&zombie_upcalls); 890111028Sjeff mtx_unlock_spin(&kse_zombie_lock); 891105854Sjulian while (td_first) { 892105854Sjulian td_next = TAILQ_NEXT(td_first, td_runq); 893111028Sjeff if (td_first->td_ucred) 894111028Sjeff crfree(td_first->td_ucred); 895105854Sjulian thread_free(td_first); 896105854Sjulian td_first = td_next; 89799026Sjulian } 898105854Sjulian while (ke_first) { 899105854Sjulian ke_next = TAILQ_NEXT(ke_first, ke_procq); 900105854Sjulian kse_free(ke_first); 901105854Sjulian ke_first = ke_next; 902105854Sjulian } 903105854Sjulian while (kg_first) { 904105854Sjulian kg_next = TAILQ_NEXT(kg_first, kg_ksegrp); 905105854Sjulian ksegrp_free(kg_first); 906105854Sjulian kg_first = kg_next; 907105854Sjulian } 908111028Sjeff while (ku_first) { 909111028Sjeff ku_next = TAILQ_NEXT(ku_first, ku_link); 910111028Sjeff upcall_free(ku_first); 911111028Sjeff ku_first = ku_next; 912111028Sjeff } 91399026Sjulian } 91499026Sjulian} 91599026Sjulian 91699026Sjulian/* 917103367Sjulian * Allocate a ksegrp. 918103367Sjulian */ 919103367Sjulianstruct ksegrp * 920103367Sjulianksegrp_alloc(void) 921103367Sjulian{ 922111119Simp return (uma_zalloc(ksegrp_zone, M_WAITOK)); 923103367Sjulian} 924103367Sjulian 925103367Sjulian/* 926103367Sjulian * Allocate a kse. 927103367Sjulian */ 928103367Sjulianstruct kse * 929103367Sjuliankse_alloc(void) 930103367Sjulian{ 931111119Simp return (uma_zalloc(kse_zone, M_WAITOK)); 932103367Sjulian} 933103367Sjulian 934103367Sjulian/* 93599026Sjulian * Allocate a thread. 93699026Sjulian */ 93799026Sjulianstruct thread * 93899026Sjulianthread_alloc(void) 93999026Sjulian{ 94099026Sjulian thread_reap(); /* check if any zombies to get */ 941111119Simp return (uma_zalloc(thread_zone, M_WAITOK)); 94299026Sjulian} 94399026Sjulian 94499026Sjulian/* 945103367Sjulian * Deallocate a ksegrp. 946103367Sjulian */ 947103367Sjulianvoid 948103367Sjulianksegrp_free(struct ksegrp *td) 949103367Sjulian{ 950103367Sjulian uma_zfree(ksegrp_zone, td); 951103367Sjulian} 952103367Sjulian 953103367Sjulian/* 954103367Sjulian * Deallocate a kse. 955103367Sjulian */ 956103367Sjulianvoid 957103367Sjuliankse_free(struct kse *td) 958103367Sjulian{ 959103367Sjulian uma_zfree(kse_zone, td); 960103367Sjulian} 961103367Sjulian 962103367Sjulian/* 96399026Sjulian * Deallocate a thread. 96499026Sjulian */ 96599026Sjulianvoid 96699026Sjulianthread_free(struct thread *td) 96799026Sjulian{ 968107719Sjulian 969107719Sjulian cpu_thread_clean(td); 97099026Sjulian uma_zfree(thread_zone, td); 97199026Sjulian} 97299026Sjulian 97399026Sjulian/* 97499026Sjulian * Store the thread context in the UTS's mailbox. 975104031Sjulian * then add the mailbox at the head of a list we are building in user space. 976104031Sjulian * The list is anchored in the ksegrp structure. 97799026Sjulian */ 97899026Sjulianint 97999026Sjulianthread_export_context(struct thread *td) 98099026Sjulian{ 981104503Sjmallett struct proc *p; 982104031Sjulian struct ksegrp *kg; 983104031Sjulian uintptr_t mbx; 984104031Sjulian void *addr; 985111028Sjeff int error,temp; 986103410Smini ucontext_t uc; 98799026Sjulian 988104503Sjmallett p = td->td_proc; 989104503Sjmallett kg = td->td_ksegrp; 990104503Sjmallett 991104031Sjulian /* Export the user/machine context. */ 992111028Sjeff addr = (void *)(&td->td_mailbox->tm_context); 993104031Sjulian error = copyin(addr, &uc, sizeof(ucontext_t)); 994108338Sjulian if (error) 995108338Sjulian goto bad; 996104031Sjulian 997108338Sjulian thread_getcontext(td, &uc); 998108338Sjulian error = copyout(&uc, addr, sizeof(ucontext_t)); 999108338Sjulian if (error) 1000108338Sjulian goto bad; 1001108338Sjulian 1002111028Sjeff /* Exports clock ticks in kernel mode */ 1003111028Sjeff addr = (caddr_t)(&td->td_mailbox->tm_sticks); 1004111028Sjeff temp = fuword(addr) + td->td_usticks; 1005111028Sjeff if (suword(addr, temp)) 1006111028Sjeff goto bad; 1007111028Sjeff 1008111028Sjeff /* Get address in latest mbox of list pointer */ 1009104031Sjulian addr = (void *)(&td->td_mailbox->tm_next); 1010104031Sjulian /* 1011104031Sjulian * Put the saved address of the previous first 1012104031Sjulian * entry into this one 1013104031Sjulian */ 1014104031Sjulian for (;;) { 1015104031Sjulian mbx = (uintptr_t)kg->kg_completed; 1016104031Sjulian if (suword(addr, mbx)) { 1017108338Sjulian error = EFAULT; 1018107034Sdavidxu goto bad; 1019104031Sjulian } 1020104126Sjulian PROC_LOCK(p); 1021104031Sjulian if (mbx == (uintptr_t)kg->kg_completed) { 1022104031Sjulian kg->kg_completed = td->td_mailbox; 1023111028Sjeff /* 1024111028Sjeff * The thread context may be taken away by 1025111028Sjeff * other upcall threads when we unlock 1026111028Sjeff * process lock. it's no longer valid to 1027111028Sjeff * use it again in any other places. 1028111028Sjeff */ 1029111028Sjeff td->td_mailbox = NULL; 1030104126Sjulian PROC_UNLOCK(p); 1031104031Sjulian break; 1032104031Sjulian } 1033104126Sjulian PROC_UNLOCK(p); 1034104031Sjulian } 1035111028Sjeff td->td_usticks = 0; 1036104031Sjulian return (0); 1037107034Sdavidxu 1038107034Sdavidxubad: 1039107034Sdavidxu PROC_LOCK(p); 1040107034Sdavidxu psignal(p, SIGSEGV); 1041107034Sdavidxu PROC_UNLOCK(p); 1042111028Sjeff /* The mailbox is bad, don't use it */ 1043111028Sjeff td->td_mailbox = NULL; 1044111028Sjeff td->td_usticks = 0; 1045108338Sjulian return (error); 1046104031Sjulian} 104799026Sjulian 1048104031Sjulian/* 1049104031Sjulian * Take the list of completed mailboxes for this KSEGRP and put them on this 1050111028Sjeff * upcall's mailbox as it's the next one going up. 1051104031Sjulian */ 1052104031Sjulianstatic int 1053111028Sjeffthread_link_mboxes(struct ksegrp *kg, struct kse_upcall *ku) 1054104031Sjulian{ 1055104126Sjulian struct proc *p = kg->kg_proc; 1056104031Sjulian void *addr; 1057104031Sjulian uintptr_t mbx; 1058104031Sjulian 1059111028Sjeff addr = (void *)(&ku->ku_mailbox->km_completed); 1060104031Sjulian for (;;) { 1061104031Sjulian mbx = (uintptr_t)kg->kg_completed; 1062104031Sjulian if (suword(addr, mbx)) { 1063104126Sjulian PROC_LOCK(p); 1064104126Sjulian psignal(p, SIGSEGV); 1065104126Sjulian PROC_UNLOCK(p); 1066104031Sjulian return (EFAULT); 1067104031Sjulian } 1068104031Sjulian /* XXXKSE could use atomic CMPXCH here */ 1069104126Sjulian PROC_LOCK(p); 1070104031Sjulian if (mbx == (uintptr_t)kg->kg_completed) { 1071104031Sjulian kg->kg_completed = NULL; 1072104126Sjulian PROC_UNLOCK(p); 1073104031Sjulian break; 1074104031Sjulian } 1075104126Sjulian PROC_UNLOCK(p); 107699026Sjulian } 1077104031Sjulian return (0); 107899026Sjulian} 107999026Sjulian 108099026Sjulian/* 1081107034Sdavidxu * This function should be called at statclock interrupt time 1082107034Sdavidxu */ 1083107034Sdavidxuint 1084111028Sjeffthread_statclock(int user) 1085107034Sdavidxu{ 1086107034Sdavidxu struct thread *td = curthread; 1087107034Sdavidxu 1088111028Sjeff if (td->td_ksegrp->kg_numupcalls == 0) 1089111028Sjeff return (-1); 1090107034Sdavidxu if (user) { 1091107034Sdavidxu /* Current always do via ast() */ 1092111032Sjulian td->td_flags |= (TDF_USTATCLOCK|TDF_ASTPENDING); 1093111028Sjeff td->td_uuticks++; 1094107034Sdavidxu } else { 1095107034Sdavidxu if (td->td_mailbox != NULL) 1096111028Sjeff td->td_usticks++; 1097111028Sjeff else { 1098111028Sjeff /* XXXKSE 1099111028Sjeff * We will call thread_user_enter() for every 1100111028Sjeff * kernel entry in future, so if the thread mailbox 1101111028Sjeff * is NULL, it must be a UTS kernel, don't account 1102111028Sjeff * clock ticks for it. 1103111028Sjeff */ 1104111028Sjeff } 1105107034Sdavidxu } 1106111028Sjeff return (0); 1107107034Sdavidxu} 1108107034Sdavidxu 1109111028Sjeff/* 1110111028Sjeff * Export user mode state clock ticks 1111111028Sjeff */ 1112107034Sdavidxustatic int 1113111028Sjeffthread_update_usr_ticks(struct thread *td) 1114107034Sdavidxu{ 1115107034Sdavidxu struct proc *p = td->td_proc; 1116107034Sdavidxu struct kse_thr_mailbox *tmbx; 1117111028Sjeff struct kse_upcall *ku; 1118107034Sdavidxu caddr_t addr; 1119111028Sjeff uint uticks; 1120107034Sdavidxu 1121111028Sjeff if ((ku = td->td_upcall) == NULL) 1122111028Sjeff return (-1); 1123111028Sjeff 1124111028Sjeff tmbx = (void *)fuword((void *)&ku->ku_mailbox->km_curthread); 1125107034Sdavidxu if ((tmbx == NULL) || (tmbx == (void *)-1)) 1126111028Sjeff return (-1); 1127111028Sjeff uticks = td->td_uuticks; 1128111028Sjeff td->td_uuticks = 0; 1129107034Sdavidxu if (uticks) { 1130111028Sjeff addr = (caddr_t)&tmbx->tm_uticks; 1131107034Sdavidxu uticks += fuword(addr); 1132111028Sjeff if (suword(addr, uticks)) { 1133111028Sjeff PROC_LOCK(p); 1134111028Sjeff psignal(p, SIGSEGV); 1135111028Sjeff PROC_UNLOCK(p); 1136111028Sjeff return (-2); 1137111028Sjeff } 1138107034Sdavidxu } 1139111028Sjeff return (0); 1140111028Sjeff} 1141111028Sjeff 1142111028Sjeff/* 1143111028Sjeff * Export kernel mode state clock ticks 1144111028Sjeff */ 1145111028Sjeff 1146111028Sjeffstatic int 1147111028Sjeffthread_update_sys_ticks(struct thread *td) 1148111028Sjeff{ 1149111028Sjeff struct proc *p = td->td_proc; 1150111028Sjeff caddr_t addr; 1151111028Sjeff int sticks; 1152111028Sjeff 1153111028Sjeff if (td->td_mailbox == NULL) 1154111028Sjeff return (-1); 1155111028Sjeff if (td->td_usticks == 0) 1156111028Sjeff return (0); 1157111028Sjeff addr = (caddr_t)&td->td_mailbox->tm_sticks; 1158111028Sjeff sticks = fuword(addr); 1159111028Sjeff sticks += td->td_usticks; 1160111028Sjeff td->td_usticks = 0; 1161111028Sjeff if (suword(addr, sticks)) { 1162111028Sjeff PROC_LOCK(p); 1163111028Sjeff psignal(p, SIGSEGV); 1164111028Sjeff PROC_UNLOCK(p); 1165111028Sjeff return (-2); 1166107034Sdavidxu } 1167111028Sjeff return (0); 1168107034Sdavidxu} 1169107034Sdavidxu 1170107034Sdavidxu/* 117199026Sjulian * Discard the current thread and exit from its context. 117299026Sjulian * 117399026Sjulian * Because we can't free a thread while we're operating under its context, 1174107719Sjulian * push the current thread into our CPU's deadthread holder. This means 1175107719Sjulian * we needn't worry about someone else grabbing our context before we 1176107719Sjulian * do a cpu_throw(). 117799026Sjulian */ 117899026Sjulianvoid 117999026Sjulianthread_exit(void) 118099026Sjulian{ 118199026Sjulian struct thread *td; 118299026Sjulian struct kse *ke; 118399026Sjulian struct proc *p; 118499026Sjulian struct ksegrp *kg; 118599026Sjulian 118699026Sjulian td = curthread; 118799026Sjulian kg = td->td_ksegrp; 118899026Sjulian p = td->td_proc; 118999026Sjulian ke = td->td_kse; 119099026Sjulian 119199026Sjulian mtx_assert(&sched_lock, MA_OWNED); 1192102581Sjulian KASSERT(p != NULL, ("thread exiting without a process")); 1193102581Sjulian KASSERT(ke != NULL, ("thread exiting without a kse")); 1194102581Sjulian KASSERT(kg != NULL, ("thread exiting without a kse group")); 119599026Sjulian PROC_LOCK_ASSERT(p, MA_OWNED); 119699026Sjulian CTR1(KTR_PROC, "thread_exit: thread %p", td); 119799026Sjulian KASSERT(!mtx_owned(&Giant), ("dying thread owns giant")); 119899026Sjulian 1199104695Sjulian if (td->td_standin != NULL) { 1200104695Sjulian thread_stash(td->td_standin); 1201104695Sjulian td->td_standin = NULL; 1202104695Sjulian } 1203104695Sjulian 120499026Sjulian cpu_thread_exit(td); /* XXXSMP */ 120599026Sjulian 1206102581Sjulian /* 1207103002Sjulian * The last thread is left attached to the process 1208103002Sjulian * So that the whole bundle gets recycled. Skip 1209103002Sjulian * all this stuff. 1210102581Sjulian */ 1211103002Sjulian if (p->p_numthreads > 1) { 1212105854Sjulian /* 1213105854Sjulian * Unlink this thread from its proc and the kseg. 1214105854Sjulian * In keeping with the other structs we probably should 1215105854Sjulian * have a thread_unlink() that does some of this but it 1216105854Sjulian * would only be called from here (I think) so it would 1217105854Sjulian * be a waste. (might be useful for proc_fini() as well.) 1218105854Sjulian */ 1219103002Sjulian TAILQ_REMOVE(&p->p_threads, td, td_plist); 1220103002Sjulian p->p_numthreads--; 1221103002Sjulian TAILQ_REMOVE(&kg->kg_threads, td, td_kglist); 1222103002Sjulian kg->kg_numthreads--; 1223111115Sdavidxu if (p->p_maxthrwaits) 1224111115Sdavidxu wakeup(&p->p_numthreads); 1225103002Sjulian /* 1226103002Sjulian * The test below is NOT true if we are the 1227103002Sjulian * sole exiting thread. P_STOPPED_SNGL is unset 1228103002Sjulian * in exit1() after it is the only survivor. 1229103002Sjulian */ 1230103002Sjulian if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) { 1231103002Sjulian if (p->p_numthreads == p->p_suspcount) { 1232103216Sjulian thread_unsuspend_one(p->p_singlethread); 1233103002Sjulian } 123499026Sjulian } 1235104695Sjulian 1236111028Sjeff /* 1237111028Sjeff * Because each upcall structure has an owner thread, 1238111028Sjeff * owner thread exits only when process is in exiting 1239111028Sjeff * state, so upcall to userland is no longer needed, 1240111028Sjeff * deleting upcall structure is safe here. 1241111028Sjeff * So when all threads in a group is exited, all upcalls 1242111028Sjeff * in the group should be automatically freed. 1243111028Sjeff */ 1244111028Sjeff if (td->td_upcall) 1245111028Sjeff upcall_remove(td); 1246111028Sjeff 1247104695Sjulian ke->ke_state = KES_UNQUEUED; 1248111028Sjeff ke->ke_thread = NULL; 1249104695Sjulian /* 1250108338Sjulian * Decide what to do with the KSE attached to this thread. 1251104695Sjulian */ 1252111028Sjeff if (ke->ke_flags & KEF_EXIT) 1253105854Sjulian kse_unlink(ke); 1254111028Sjeff else 1255105854Sjulian kse_reassign(ke); 1256105854Sjulian PROC_UNLOCK(p); 1257111028Sjeff td->td_kse = NULL; 1258105854Sjulian td->td_state = TDS_INACTIVE; 1259105854Sjulian td->td_proc = NULL; 1260105854Sjulian td->td_ksegrp = NULL; 1261105854Sjulian td->td_last_kse = NULL; 1262107719Sjulian PCPU_SET(deadthread, td); 1263103002Sjulian } else { 1264103002Sjulian PROC_UNLOCK(p); 126599026Sjulian } 126699026Sjulian cpu_throw(); 126799026Sjulian /* NOTREACHED */ 126899026Sjulian} 126999026Sjulian 1270107719Sjulian/* 1271107719Sjulian * Do any thread specific cleanups that may be needed in wait() 1272107719Sjulian * called with Giant held, proc and schedlock not held. 1273107719Sjulian */ 1274107719Sjulianvoid 1275107719Sjulianthread_wait(struct proc *p) 1276107719Sjulian{ 1277107719Sjulian struct thread *td; 1278107719Sjulian 1279107719Sjulian KASSERT((p->p_numthreads == 1), ("Muliple threads in wait1()")); 1280107719Sjulian KASSERT((p->p_numksegrps == 1), ("Muliple ksegrps in wait1()")); 1281107719Sjulian FOREACH_THREAD_IN_PROC(p, td) { 1282107719Sjulian if (td->td_standin != NULL) { 1283107719Sjulian thread_free(td->td_standin); 1284107719Sjulian td->td_standin = NULL; 1285107719Sjulian } 1286107719Sjulian cpu_thread_clean(td); 1287107719Sjulian } 1288107719Sjulian thread_reap(); /* check for zombie threads etc. */ 1289107719Sjulian} 1290107719Sjulian 129199026Sjulian/* 129299026Sjulian * Link a thread to a process. 1293103002Sjulian * set up anything that needs to be initialized for it to 1294103002Sjulian * be used by the process. 129599026Sjulian * 129699026Sjulian * Note that we do not link to the proc's ucred here. 129799026Sjulian * The thread is linked as if running but no KSE assigned. 129899026Sjulian */ 129999026Sjulianvoid 130099026Sjulianthread_link(struct thread *td, struct ksegrp *kg) 130199026Sjulian{ 130299026Sjulian struct proc *p; 130399026Sjulian 130499026Sjulian p = kg->kg_proc; 1305111028Sjeff td->td_state = TDS_INACTIVE; 1306111028Sjeff td->td_proc = p; 1307111028Sjeff td->td_ksegrp = kg; 1308111028Sjeff td->td_last_kse = NULL; 1309111028Sjeff td->td_flags = 0; 1310111028Sjeff td->td_kse = NULL; 131199026Sjulian 1312103002Sjulian LIST_INIT(&td->td_contested); 1313103002Sjulian callout_init(&td->td_slpcallout, 1); 131499026Sjulian TAILQ_INSERT_HEAD(&p->p_threads, td, td_plist); 131599026Sjulian TAILQ_INSERT_HEAD(&kg->kg_threads, td, td_kglist); 131699026Sjulian p->p_numthreads++; 131799026Sjulian kg->kg_numthreads++; 131899026Sjulian} 131999026Sjulian 1320111028Sjeff/* 1321111028Sjeff * Purge a ksegrp resource. When a ksegrp is preparing to 1322111028Sjeff * exit, it calls this function. 1323111028Sjeff */ 1324105854Sjulianvoid 1325111028Sjeffkse_purge_group(struct thread *td) 1326111028Sjeff{ 1327111028Sjeff struct ksegrp *kg; 1328111028Sjeff struct kse *ke; 1329111028Sjeff 1330111028Sjeff kg = td->td_ksegrp; 1331111028Sjeff KASSERT(kg->kg_numthreads == 1, ("%s: bad thread number", __func__)); 1332111028Sjeff while ((ke = TAILQ_FIRST(&kg->kg_iq)) != NULL) { 1333111028Sjeff KASSERT(ke->ke_state == KES_IDLE, 1334111028Sjeff ("%s: wrong idle KSE state", __func__)); 1335111028Sjeff kse_unlink(ke); 1336111028Sjeff } 1337111028Sjeff KASSERT((kg->kg_kses == 1), 1338111028Sjeff ("%s: ksegrp still has %d KSEs", __func__, kg->kg_kses)); 1339111028Sjeff KASSERT((kg->kg_numupcalls == 0), 1340111028Sjeff ("%s: ksegrp still has %d upcall datas", 1341111028Sjeff __func__, kg->kg_numupcalls)); 1342111028Sjeff} 1343111028Sjeff 1344111028Sjeff/* 1345111028Sjeff * Purge a process's KSE resource. When a process is preparing to 1346111028Sjeff * exit, it calls kse_purge to release any extra KSE resources in 1347111028Sjeff * the process. 1348111028Sjeff */ 1349111028Sjeffvoid 1350105854Sjuliankse_purge(struct proc *p, struct thread *td) 1351105854Sjulian{ 1352105854Sjulian struct ksegrp *kg; 1353111028Sjeff struct kse *ke; 1354105854Sjulian 1355105854Sjulian KASSERT(p->p_numthreads == 1, ("bad thread number")); 1356105854Sjulian mtx_lock_spin(&sched_lock); 1357105854Sjulian while ((kg = TAILQ_FIRST(&p->p_ksegrps)) != NULL) { 1358105854Sjulian TAILQ_REMOVE(&p->p_ksegrps, kg, kg_ksegrp); 1359105854Sjulian p->p_numksegrps--; 1360111028Sjeff /* 1361111028Sjeff * There is no ownership for KSE, after all threads 1362111028Sjeff * in the group exited, it is possible that some KSEs 1363111028Sjeff * were left in idle queue, gc them now. 1364111028Sjeff */ 1365111028Sjeff while ((ke = TAILQ_FIRST(&kg->kg_iq)) != NULL) { 1366111028Sjeff KASSERT(ke->ke_state == KES_IDLE, 1367111028Sjeff ("%s: wrong idle KSE state", __func__)); 1368111028Sjeff TAILQ_REMOVE(&kg->kg_iq, ke, ke_kgrlist); 1369111028Sjeff kg->kg_idle_kses--; 1370111028Sjeff TAILQ_REMOVE(&kg->kg_kseq, ke, ke_kglist); 1371111028Sjeff kg->kg_kses--; 1372111028Sjeff kse_stash(ke); 1373111028Sjeff } 1374105854Sjulian KASSERT(((kg->kg_kses == 0) && (kg != td->td_ksegrp)) || 1375111028Sjeff ((kg->kg_kses == 1) && (kg == td->td_ksegrp)), 1376111028Sjeff ("ksegrp has wrong kg_kses: %d", kg->kg_kses)); 1377111028Sjeff KASSERT((kg->kg_numupcalls == 0), 1378111028Sjeff ("%s: ksegrp still has %d upcall datas", 1379111028Sjeff __func__, kg->kg_numupcalls)); 1380111028Sjeff 1381111028Sjeff if (kg != td->td_ksegrp) 1382105854Sjulian ksegrp_stash(kg); 1383105854Sjulian } 1384105854Sjulian TAILQ_INSERT_HEAD(&p->p_ksegrps, td->td_ksegrp, kg_ksegrp); 1385105854Sjulian p->p_numksegrps++; 1386105854Sjulian mtx_unlock_spin(&sched_lock); 1387105854Sjulian} 1388105854Sjulian 1389111028Sjeff/* 1390111028Sjeff * This function is intended to be used to initialize a spare thread 1391111028Sjeff * for upcall. Initialize thread's large data area outside sched_lock 1392111028Sjeff * for thread_schedule_upcall(). 1393111028Sjeff */ 1394111028Sjeffvoid 1395111028Sjeffthread_alloc_spare(struct thread *td, struct thread *spare) 1396111028Sjeff{ 1397111028Sjeff if (td->td_standin) 1398111028Sjeff return; 1399111028Sjeff if (spare == NULL) 1400111028Sjeff spare = thread_alloc(); 1401111028Sjeff td->td_standin = spare; 1402111028Sjeff bzero(&spare->td_startzero, 1403111028Sjeff (unsigned)RANGEOF(struct thread, td_startzero, td_endzero)); 1404111028Sjeff spare->td_proc = td->td_proc; 1405111028Sjeff /* Setup PCB and fork address */ 1406111028Sjeff cpu_set_upcall(spare, td->td_pcb); 1407111028Sjeff /* 1408111028Sjeff * XXXKSE do we really need this? (default values for the 1409111028Sjeff * frame). 1410111028Sjeff */ 1411111028Sjeff bcopy(td->td_frame, spare->td_frame, sizeof(struct trapframe)); 1412111028Sjeff spare->td_ucred = crhold(td->td_ucred); 1413111028Sjeff} 1414105854Sjulian 141599026Sjulian/* 1416103410Smini * Create a thread and schedule it for upcall on the KSE given. 1417108338Sjulian * Use our thread's standin so that we don't have to allocate one. 141899026Sjulian */ 141999026Sjulianstruct thread * 1420111028Sjeffthread_schedule_upcall(struct thread *td, struct kse_upcall *ku) 142199026Sjulian{ 142299026Sjulian struct thread *td2; 142399026Sjulian 142499026Sjulian mtx_assert(&sched_lock, MA_OWNED); 1425104695Sjulian 1426104695Sjulian /* 1427111028Sjeff * Schedule an upcall thread on specified kse_upcall, 1428111028Sjeff * the kse_upcall must be free. 1429111028Sjeff * td must have a spare thread. 1430104695Sjulian */ 1431111028Sjeff KASSERT(ku->ku_owner == NULL, ("%s: upcall has owner", __func__)); 1432104695Sjulian if ((td2 = td->td_standin) != NULL) { 1433104695Sjulian td->td_standin = NULL; 143499026Sjulian } else { 1435111028Sjeff panic("no reserve thread when scheduling an upcall"); 1436106182Sdavidxu return (NULL); 143799026Sjulian } 143899026Sjulian CTR3(KTR_PROC, "thread_schedule_upcall: thread %p (pid %d, %s)", 1439104695Sjulian td2, td->td_proc->p_pid, td->td_proc->p_comm); 1440103002Sjulian bcopy(&td->td_startcopy, &td2->td_startcopy, 1441103002Sjulian (unsigned) RANGEOF(struct thread, td_startcopy, td_endcopy)); 1442111028Sjeff thread_link(td2, ku->ku_ksegrp); 1443111028Sjeff /* Let the new thread become owner of the upcall */ 1444111028Sjeff ku->ku_owner = td2; 1445111028Sjeff td2->td_upcall = ku; 1446111028Sjeff td2->td_flags = TDF_UPCALLING; 1447111041Sdavidxu if (td->td_proc->p_sflag & PS_NEEDSIGCHK) 1448111041Sdavidxu td2->td_flags |= TDF_ASTPENDING; 1449111028Sjeff td2->td_kse = NULL; 1450111028Sjeff td2->td_state = TDS_CAN_RUN; 1451104695Sjulian td2->td_inhibitors = 0; 1452111028Sjeff setrunqueue(td2); 1453104695Sjulian return (td2); /* bogus.. should be a void function */ 145499026Sjulian} 145599026Sjulian 1456111033Sjeffvoid 1457111033Sjeffthread_signal_add(struct thread *td, int sig) 1458103410Smini{ 1459111033Sjeff struct kse_upcall *ku; 1460111033Sjeff struct proc *p; 1461103410Smini sigset_t ss; 1462103410Smini int error; 1463103410Smini 1464111033Sjeff PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 1465111033Sjeff td = curthread; 1466111033Sjeff ku = td->td_upcall; 1467111033Sjeff p = td->td_proc; 1468111033Sjeff 1469103410Smini PROC_UNLOCK(p); 1470111033Sjeff error = copyin(&ku->ku_mailbox->km_sigscaught, &ss, sizeof(sigset_t)); 1471103410Smini if (error) 1472111033Sjeff goto error; 1473111033Sjeff 1474103410Smini SIGADDSET(ss, sig); 1475111033Sjeff 1476111033Sjeff error = copyout(&ss, &ku->ku_mailbox->km_sigscaught, sizeof(sigset_t)); 1477111033Sjeff if (error) 1478111033Sjeff goto error; 1479111033Sjeff 1480103410Smini PROC_LOCK(p); 1481111033Sjeff return; 1482111033Sjefferror: 1483111033Sjeff PROC_LOCK(p); 1484111033Sjeff sigexit(td, SIGILL); 1485111033Sjeff} 1486111033Sjeff 1487111033Sjeff 1488111033Sjeff/* 1489111033Sjeff * Schedule an upcall to notify a KSE process recieved signals. 1490111033Sjeff * 1491111033Sjeff */ 1492111033Sjeffvoid 1493111033Sjeffthread_signal_upcall(struct thread *td) 1494111033Sjeff{ 1495103410Smini mtx_lock_spin(&sched_lock); 1496111033Sjeff td->td_flags |= TDF_UPCALLING; 1497103410Smini mtx_unlock_spin(&sched_lock); 1498111033Sjeff 1499111033Sjeff return; 1500103410Smini} 1501103410Smini 1502103410Smini/* 1503111028Sjeff * Setup done on the thread when it enters the kernel. 1504105900Sjulian * XXXKSE Presently only for syscalls but eventually all kernel entries. 1505105900Sjulian */ 1506105900Sjulianvoid 1507105900Sjulianthread_user_enter(struct proc *p, struct thread *td) 1508105900Sjulian{ 1509111028Sjeff struct ksegrp *kg; 1510111028Sjeff struct kse_upcall *ku; 1511105900Sjulian 1512111028Sjeff kg = td->td_ksegrp; 1513105900Sjulian /* 1514105900Sjulian * First check that we shouldn't just abort. 1515105900Sjulian * But check if we are the single thread first! 1516105900Sjulian * XXX p_singlethread not locked, but should be safe. 1517105900Sjulian */ 1518111028Sjeff if ((p->p_flag & P_SINGLE_EXIT) && (p->p_singlethread != td)) { 1519105900Sjulian PROC_LOCK(p); 1520105900Sjulian mtx_lock_spin(&sched_lock); 1521105900Sjulian thread_exit(); 1522105900Sjulian /* NOTREACHED */ 1523105900Sjulian } 1524105900Sjulian 1525105900Sjulian /* 1526105900Sjulian * If we are doing a syscall in a KSE environment, 1527105900Sjulian * note where our mailbox is. There is always the 1528108338Sjulian * possibility that we could do this lazily (in kse_reassign()), 1529105900Sjulian * but for now do it every time. 1530105900Sjulian */ 1531111028Sjeff kg = td->td_ksegrp; 1532111028Sjeff if (kg->kg_numupcalls) { 1533111028Sjeff ku = td->td_upcall; 1534111028Sjeff KASSERT(ku, ("%s: no upcall owned", __func__)); 1535111028Sjeff KASSERT((ku->ku_owner == td), ("%s: wrong owner", __func__)); 1536105900Sjulian td->td_mailbox = 1537111028Sjeff (void *)fuword((void *)&ku->ku_mailbox->km_curthread); 1538105900Sjulian if ((td->td_mailbox == NULL) || 1539107034Sdavidxu (td->td_mailbox == (void *)-1)) { 1540111028Sjeff /* Don't schedule upcall when blocked */ 1541111028Sjeff td->td_mailbox = NULL; 1542107034Sdavidxu mtx_lock_spin(&sched_lock); 1543111028Sjeff td->td_flags &= ~TDF_CAN_UNBIND; 1544107034Sdavidxu mtx_unlock_spin(&sched_lock); 1545105900Sjulian } else { 1546111115Sdavidxu if (td->td_standin == NULL) 1547111115Sdavidxu thread_alloc_spare(td, NULL); 1548111115Sdavidxu mtx_lock_spin(&sched_lock); 1549111115Sdavidxu td->td_flags |= TDF_CAN_UNBIND; 1550111115Sdavidxu mtx_unlock_spin(&sched_lock); 1551105900Sjulian } 1552105900Sjulian } 1553105900Sjulian} 1554105900Sjulian 1555105900Sjulian/* 1556103410Smini * The extra work we go through if we are a threaded process when we 1557103410Smini * return to userland. 1558103410Smini * 155999026Sjulian * If we are a KSE process and returning to user mode, check for 156099026Sjulian * extra work to do before we return (e.g. for more syscalls 156199026Sjulian * to complete first). If we were in a critical section, we should 156299026Sjulian * just return to let it finish. Same if we were in the UTS (in 1563103410Smini * which case the mailbox's context's busy indicator will be set). 1564103410Smini * The only traps we suport will have set the mailbox. 1565103410Smini * We will clear it here. 156699026Sjulian */ 156799026Sjulianint 1568103838Sjulianthread_userret(struct thread *td, struct trapframe *frame) 156999026Sjulian{ 1570111115Sdavidxu int error = 0, upcalls; 1571111028Sjeff struct kse_upcall *ku; 1572111115Sdavidxu struct ksegrp *kg, *kg2; 1573104695Sjulian struct proc *p; 1574107060Sdavidxu struct timespec ts; 157599026Sjulian 1576111028Sjeff p = td->td_proc; 1577110190Sjulian kg = td->td_ksegrp; 1578104695Sjulian 1579111028Sjeff /* Nothing to do with non-threaded group/process */ 1580111028Sjeff if (td->td_ksegrp->kg_numupcalls == 0) 1581111028Sjeff return (0); 1582108338Sjulian 1583103410Smini /* 1584111028Sjeff * Stat clock interrupt hit in userland, it 1585111028Sjeff * is returning from interrupt, charge thread's 1586111028Sjeff * userland time for UTS. 1587103410Smini */ 1588111028Sjeff if (td->td_flags & TDF_USTATCLOCK) { 1589111028Sjeff thread_update_usr_ticks(td); 1590111028Sjeff mtx_lock_spin(&sched_lock); 1591111028Sjeff td->td_flags &= ~TDF_USTATCLOCK; 1592111028Sjeff mtx_unlock_spin(&sched_lock); 1593111028Sjeff } 1594108338Sjulian 1595111028Sjeff /* 1596111028Sjeff * Optimisation: 1597111028Sjeff * This thread has not started any upcall. 1598111028Sjeff * If there is no work to report other than ourself, 1599111028Sjeff * then it can return direct to userland. 1600111028Sjeff */ 1601108338Sjulian if (TD_CAN_UNBIND(td)) { 1602111028Sjeff mtx_lock_spin(&sched_lock); 1603111028Sjeff td->td_flags &= ~TDF_CAN_UNBIND; 1604111028Sjeff mtx_unlock_spin(&sched_lock); 1605111028Sjeff if ((kg->kg_completed == NULL) && 1606111028Sjeff (td->td_upcall->ku_flags & KUF_DOUPCALL) == 0) { 1607111028Sjeff thread_update_sys_ticks(td); 1608108338Sjulian td->td_mailbox = NULL; 1609108338Sjulian return (0); 1610108338Sjulian } 1611104695Sjulian error = thread_export_context(td); 1612104695Sjulian if (error) { 1613104695Sjulian /* 1614111028Sjeff * Failing to do the KSE operation just defaults 1615104695Sjulian * back to synchonous operation, so just return from 1616108338Sjulian * the syscall. 1617104695Sjulian */ 1618111028Sjeff return (0); 1619104695Sjulian } 1620104695Sjulian /* 1621111028Sjeff * There is something to report, and we own an upcall 1622111028Sjeff * strucuture, we can go to userland. 1623111028Sjeff * Turn ourself into an upcall thread. 1624104695Sjulian */ 1625111028Sjeff mtx_lock_spin(&sched_lock); 1626104695Sjulian td->td_flags |= TDF_UPCALLING; 1627108338Sjulian mtx_unlock_spin(&sched_lock); 1628111028Sjeff } else if (td->td_mailbox) { 1629108338Sjulian error = thread_export_context(td); 1630108338Sjulian if (error) { 1631108338Sjulian PROC_LOCK(td->td_proc); 1632108338Sjulian mtx_lock_spin(&sched_lock); 1633108338Sjulian /* possibly upcall with error? */ 1634108338Sjulian } else { 1635111028Sjeff PROC_LOCK(td->td_proc); 1636111028Sjeff mtx_lock_spin(&sched_lock); 1637108338Sjulian /* 1638111028Sjeff * There are upcall threads waiting for 1639111028Sjeff * work to do, wake one of them up. 1640111028Sjeff * XXXKSE Maybe wake all of them up. 1641108338Sjulian */ 1642111028Sjeff if (kg->kg_upsleeps) 1643111028Sjeff wakeup_one(&kg->kg_completed); 1644108338Sjulian } 1645108338Sjulian thread_exit(); 1646111028Sjeff /* NOTREACHED */ 1647104695Sjulian } 1648104695Sjulian 1649111154Sdavidxu KASSERT(TD_CAN_UNBIND(td) == 0, ("can unbind")); 1650111154Sdavidxu 1651111154Sdavidxu if (p->p_numthreads > max_threads_per_proc) { 1652111154Sdavidxu max_threads_hits++; 1653111154Sdavidxu PROC_LOCK(p); 1654111154Sdavidxu while (p->p_numthreads > max_threads_per_proc) { 1655111154Sdavidxu if (P_SHOULDSTOP(p)) 1656111154Sdavidxu break; 1657111154Sdavidxu upcalls = 0; 1658111154Sdavidxu mtx_lock_spin(&sched_lock); 1659111154Sdavidxu FOREACH_KSEGRP_IN_PROC(p, kg2) { 1660111154Sdavidxu if (kg2->kg_numupcalls == 0) 1661111154Sdavidxu upcalls++; 1662111154Sdavidxu else 1663111154Sdavidxu upcalls += kg2->kg_numupcalls; 1664111154Sdavidxu } 1665111154Sdavidxu mtx_unlock_spin(&sched_lock); 1666111154Sdavidxu if (upcalls >= max_threads_per_proc) 1667111154Sdavidxu break; 1668111154Sdavidxu p->p_maxthrwaits++; 1669111154Sdavidxu msleep(&p->p_numthreads, &p->p_mtx, PPAUSE|PCATCH, 1670111154Sdavidxu "maxthreads", NULL); 1671111154Sdavidxu p->p_maxthrwaits--; 1672111154Sdavidxu } 1673111154Sdavidxu PROC_UNLOCK(p); 1674111154Sdavidxu } 1675111154Sdavidxu 1676108338Sjulian if (td->td_flags & TDF_UPCALLING) { 1677111028Sjeff ku = td->td_upcall; 1678108338Sjulian /* 1679108338Sjulian * There is no more work to do and we are going to ride 1680111028Sjeff * this thread up to userland as an upcall. 1681108338Sjulian * Do the last parts of the setup needed for the upcall. 1682108338Sjulian */ 1683108338Sjulian CTR3(KTR_PROC, "userret: upcall thread %p (pid %d, %s)", 1684108338Sjulian td, td->td_proc->p_pid, td->td_proc->p_comm); 1685104695Sjulian 1686108338Sjulian /* 1687108338Sjulian * Set user context to the UTS. 1688108338Sjulian * Will use Giant in cpu_thread_clean() because it uses 1689108338Sjulian * kmem_free(kernel_map, ...) 1690108338Sjulian */ 1691111028Sjeff cpu_set_upcall_kse(td, ku); 1692104695Sjulian 1693111028Sjeff /* 1694111028Sjeff * Clear TDF_UPCALLING after set upcall context, 1695111028Sjeff * profiling code looks TDF_UPCALLING to avoid account 1696111028Sjeff * a wrong user %EIP 1697111028Sjeff */ 1698111028Sjeff mtx_lock_spin(&sched_lock); 1699111028Sjeff td->td_flags &= ~TDF_UPCALLING; 1700111028Sjeff if (ku->ku_flags & KUF_DOUPCALL) 1701111028Sjeff ku->ku_flags &= ~KUF_DOUPCALL; 1702111028Sjeff mtx_unlock_spin(&sched_lock); 1703111028Sjeff 1704111028Sjeff /* 1705108338Sjulian * Unhook the list of completed threads. 1706108338Sjulian * anything that completes after this gets to 1707108338Sjulian * come in next time. 1708108338Sjulian * Put the list of completed thread mailboxes on 1709108338Sjulian * this KSE's mailbox. 1710108338Sjulian */ 1711111028Sjeff error = thread_link_mboxes(kg, ku); 1712108338Sjulian if (error) 1713111115Sdavidxu goto out; 171499026Sjulian 1715108338Sjulian /* 1716108338Sjulian * Set state and clear the thread mailbox pointer. 1717108338Sjulian * From now on we are just a bound outgoing process. 1718108338Sjulian * **Problem** userret is often called several times. 1719108338Sjulian * it would be nice if this all happenned only on the first 1720108338Sjulian * time through. (the scan for extra work etc.) 1721108338Sjulian */ 1722111028Sjeff error = suword((caddr_t)&ku->ku_mailbox->km_curthread, 0); 1723108338Sjulian if (error) 1724111115Sdavidxu goto out; 1725111028Sjeff 1726111028Sjeff /* Export current system time */ 1727107060Sdavidxu nanotime(&ts); 1728111115Sdavidxu error = copyout(&ts, (caddr_t)&ku->ku_mailbox->km_timeofday, 1729111115Sdavidxu sizeof(ts)); 1730111115Sdavidxu } 1731111115Sdavidxu 1732111115Sdavidxuout: 1733111115Sdavidxu if (error) { 1734111115Sdavidxu /* 1735111129Sdavidxu * Things are going to be so screwed we should just kill 1736111129Sdavidxu * the process. 1737111115Sdavidxu * how do we do that? 1738111115Sdavidxu */ 1739111115Sdavidxu PROC_LOCK(td->td_proc); 1740111115Sdavidxu psignal(td->td_proc, SIGSEGV); 1741111115Sdavidxu PROC_UNLOCK(td->td_proc); 1742111115Sdavidxu } else { 1743111115Sdavidxu /* 1744111115Sdavidxu * Optimisation: 1745111115Sdavidxu * Ensure that we have a spare thread available, 1746111115Sdavidxu * for when we re-enter the kernel. 1747111115Sdavidxu */ 1748111115Sdavidxu if (td->td_standin == NULL) 1749111115Sdavidxu thread_alloc_spare(td, NULL); 1750111115Sdavidxu } 1751111115Sdavidxu 1752111028Sjeff /* 1753111028Sjeff * Clear thread mailbox first, then clear system tick count. 1754111028Sjeff * The order is important because thread_statclock() use 1755111028Sjeff * mailbox pointer to see if it is an userland thread or 1756111028Sjeff * an UTS kernel thread. 1757111028Sjeff */ 1758108338Sjulian td->td_mailbox = NULL; 1759111028Sjeff td->td_usticks = 0; 1760104695Sjulian return (error); /* go sync */ 176199026Sjulian} 176299026Sjulian 176399026Sjulian/* 176499026Sjulian * Enforce single-threading. 176599026Sjulian * 176699026Sjulian * Returns 1 if the caller must abort (another thread is waiting to 176799026Sjulian * exit the process or similar). Process is locked! 176899026Sjulian * Returns 0 when you are successfully the only thread running. 176999026Sjulian * A process has successfully single threaded in the suspend mode when 177099026Sjulian * There are no threads in user mode. Threads in the kernel must be 177199026Sjulian * allowed to continue until they get to the user boundary. They may even 177299026Sjulian * copy out their return values and data before suspending. They may however be 177399026Sjulian * accellerated in reaching the user boundary as we will wake up 177499026Sjulian * any sleeping threads that are interruptable. (PCATCH). 177599026Sjulian */ 177699026Sjulianint 177799026Sjulianthread_single(int force_exit) 177899026Sjulian{ 177999026Sjulian struct thread *td; 178099026Sjulian struct thread *td2; 178199026Sjulian struct proc *p; 178299026Sjulian 178399026Sjulian td = curthread; 178499026Sjulian p = td->td_proc; 1785107719Sjulian mtx_assert(&Giant, MA_OWNED); 178699026Sjulian PROC_LOCK_ASSERT(p, MA_OWNED); 178799026Sjulian KASSERT((td != NULL), ("curthread is NULL")); 178899026Sjulian 178999026Sjulian if ((p->p_flag & P_KSES) == 0) 179099026Sjulian return (0); 179199026Sjulian 1792100648Sjulian /* Is someone already single threading? */ 1793100648Sjulian if (p->p_singlethread) 179499026Sjulian return (1); 179599026Sjulian 1796108338Sjulian if (force_exit == SINGLE_EXIT) { 179799026Sjulian p->p_flag |= P_SINGLE_EXIT; 1798108338Sjulian } else 179999026Sjulian p->p_flag &= ~P_SINGLE_EXIT; 1800102950Sdavidxu p->p_flag |= P_STOPPED_SINGLE; 180199026Sjulian p->p_singlethread = td; 1802105911Sjulian /* XXXKSE Which lock protects the below values? */ 180399026Sjulian while ((p->p_numthreads - p->p_suspcount) != 1) { 1804103216Sjulian mtx_lock_spin(&sched_lock); 180599026Sjulian FOREACH_THREAD_IN_PROC(p, td2) { 180699026Sjulian if (td2 == td) 180799026Sjulian continue; 1808111115Sdavidxu td->td_flags |= TDF_ASTPENDING; 1809103216Sjulian if (TD_IS_INHIBITED(td2)) { 1810105911Sjulian if (force_exit == SINGLE_EXIT) { 1811105911Sjulian if (TD_IS_SUSPENDED(td2)) { 1812103216Sjulian thread_unsuspend_one(td2); 1813105911Sjulian } 1814105911Sjulian if (TD_ON_SLEEPQ(td2) && 1815105911Sjulian (td2->td_flags & TDF_SINTR)) { 1816105911Sjulian if (td2->td_flags & TDF_CVWAITQ) 1817105911Sjulian cv_abort(td2); 1818105911Sjulian else 1819105911Sjulian abortsleep(td2); 1820105911Sjulian } 1821105911Sjulian } else { 1822105911Sjulian if (TD_IS_SUSPENDED(td2)) 1823105874Sdavidxu continue; 1824111028Sjeff /* 1825111028Sjeff * maybe other inhibitted states too? 1826111028Sjeff * XXXKSE Is it totally safe to 1827111028Sjeff * suspend a non-interruptable thread? 1828111028Sjeff */ 1829108338Sjulian if (td2->td_inhibitors & 1830111028Sjeff (TDI_SLEEPING | TDI_SWAPPED)) 1831105911Sjulian thread_suspend_one(td2); 183299026Sjulian } 183399026Sjulian } 183499026Sjulian } 1835105911Sjulian /* 1836105911Sjulian * Maybe we suspended some threads.. was it enough? 1837105911Sjulian */ 1838105911Sjulian if ((p->p_numthreads - p->p_suspcount) == 1) { 1839105911Sjulian mtx_unlock_spin(&sched_lock); 1840105911Sjulian break; 1841105911Sjulian } 1842105911Sjulian 184399026Sjulian /* 184499026Sjulian * Wake us up when everyone else has suspended. 1845100648Sjulian * In the mean time we suspend as well. 184699026Sjulian */ 1847103216Sjulian thread_suspend_one(td); 184899026Sjulian mtx_unlock(&Giant); 184999026Sjulian PROC_UNLOCK(p); 1850107719Sjulian p->p_stats->p_ru.ru_nvcsw++; 185199026Sjulian mi_switch(); 185299026Sjulian mtx_unlock_spin(&sched_lock); 185399026Sjulian mtx_lock(&Giant); 185499026Sjulian PROC_LOCK(p); 185599026Sjulian } 1856111028Sjeff if (force_exit == SINGLE_EXIT) { 1857111028Sjeff if (td->td_upcall) { 1858111028Sjeff mtx_lock_spin(&sched_lock); 1859111028Sjeff upcall_remove(td); 1860111028Sjeff mtx_unlock_spin(&sched_lock); 1861111028Sjeff } 1862105854Sjulian kse_purge(p, td); 1863111028Sjeff } 186499026Sjulian return (0); 186599026Sjulian} 186699026Sjulian 186799026Sjulian/* 186899026Sjulian * Called in from locations that can safely check to see 186999026Sjulian * whether we have to suspend or at least throttle for a 187099026Sjulian * single-thread event (e.g. fork). 187199026Sjulian * 187299026Sjulian * Such locations include userret(). 187399026Sjulian * If the "return_instead" argument is non zero, the thread must be able to 187499026Sjulian * accept 0 (caller may continue), or 1 (caller must abort) as a result. 187599026Sjulian * 187699026Sjulian * The 'return_instead' argument tells the function if it may do a 187799026Sjulian * thread_exit() or suspend, or whether the caller must abort and back 187899026Sjulian * out instead. 187999026Sjulian * 188099026Sjulian * If the thread that set the single_threading request has set the 188199026Sjulian * P_SINGLE_EXIT bit in the process flags then this call will never return 188299026Sjulian * if 'return_instead' is false, but will exit. 188399026Sjulian * 188499026Sjulian * P_SINGLE_EXIT | return_instead == 0| return_instead != 0 188599026Sjulian *---------------+--------------------+--------------------- 188699026Sjulian * 0 | returns 0 | returns 0 or 1 188799026Sjulian * | when ST ends | immediatly 188899026Sjulian *---------------+--------------------+--------------------- 188999026Sjulian * 1 | thread exits | returns 1 189099026Sjulian * | | immediatly 189199026Sjulian * 0 = thread_exit() or suspension ok, 189299026Sjulian * other = return error instead of stopping the thread. 189399026Sjulian * 189499026Sjulian * While a full suspension is under effect, even a single threading 189599026Sjulian * thread would be suspended if it made this call (but it shouldn't). 189699026Sjulian * This call should only be made from places where 189799026Sjulian * thread_exit() would be safe as that may be the outcome unless 189899026Sjulian * return_instead is set. 189999026Sjulian */ 190099026Sjulianint 190199026Sjulianthread_suspend_check(int return_instead) 190299026Sjulian{ 1903104502Sjmallett struct thread *td; 1904104502Sjmallett struct proc *p; 1905105854Sjulian struct ksegrp *kg; 190699026Sjulian 190799026Sjulian td = curthread; 190899026Sjulian p = td->td_proc; 1909105854Sjulian kg = td->td_ksegrp; 191099026Sjulian PROC_LOCK_ASSERT(p, MA_OWNED); 191199026Sjulian while (P_SHOULDSTOP(p)) { 1912102950Sdavidxu if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) { 191399026Sjulian KASSERT(p->p_singlethread != NULL, 191499026Sjulian ("singlethread not set")); 191599026Sjulian /* 1916100648Sjulian * The only suspension in action is a 1917100648Sjulian * single-threading. Single threader need not stop. 1918100646Sjulian * XXX Should be safe to access unlocked 1919100646Sjulian * as it can only be set to be true by us. 192099026Sjulian */ 1921100648Sjulian if (p->p_singlethread == td) 192299026Sjulian return (0); /* Exempt from stopping. */ 192399026Sjulian } 1924100648Sjulian if (return_instead) 192599026Sjulian return (1); 192699026Sjulian 192799026Sjulian /* 192899026Sjulian * If the process is waiting for us to exit, 192999026Sjulian * this thread should just suicide. 1930102950Sdavidxu * Assumes that P_SINGLE_EXIT implies P_STOPPED_SINGLE. 193199026Sjulian */ 193299026Sjulian if ((p->p_flag & P_SINGLE_EXIT) && (p->p_singlethread != td)) { 193399026Sjulian mtx_lock_spin(&sched_lock); 193499026Sjulian while (mtx_owned(&Giant)) 193599026Sjulian mtx_unlock(&Giant); 193699026Sjulian thread_exit(); 193799026Sjulian } 193899026Sjulian 193999026Sjulian /* 194099026Sjulian * When a thread suspends, it just 194199026Sjulian * moves to the processes's suspend queue 194299026Sjulian * and stays there. 194399026Sjulian */ 1944102238Sjulian mtx_lock_spin(&sched_lock); 1945102950Sdavidxu if ((p->p_flag & P_STOPPED_SIG) && 1946102238Sjulian (p->p_suspcount+1 == p->p_numthreads)) { 1947102238Sjulian mtx_unlock_spin(&sched_lock); 1948102238Sjulian PROC_LOCK(p->p_pptr); 1949102238Sjulian if ((p->p_pptr->p_procsig->ps_flag & 1950102238Sjulian PS_NOCLDSTOP) == 0) { 1951102238Sjulian psignal(p->p_pptr, SIGCHLD); 1952102238Sjulian } 1953102238Sjulian PROC_UNLOCK(p->p_pptr); 1954103055Sjulian mtx_lock_spin(&sched_lock); 1955102238Sjulian } 195699026Sjulian mtx_assert(&Giant, MA_NOTOWNED); 1957103216Sjulian thread_suspend_one(td); 195899026Sjulian PROC_UNLOCK(p); 1959102950Sdavidxu if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) { 1960100632Sjulian if (p->p_numthreads == p->p_suspcount) { 1961103216Sjulian thread_unsuspend_one(p->p_singlethread); 1962100632Sjulian } 1963100632Sjulian } 1964100594Sjulian p->p_stats->p_ru.ru_nivcsw++; 196599026Sjulian mi_switch(); 196699026Sjulian mtx_unlock_spin(&sched_lock); 196799026Sjulian PROC_LOCK(p); 196899026Sjulian } 196999026Sjulian return (0); 197099026Sjulian} 197199026Sjulian 1972102898Sdavidxuvoid 1973102898Sdavidxuthread_suspend_one(struct thread *td) 1974102898Sdavidxu{ 1975102898Sdavidxu struct proc *p = td->td_proc; 1976102898Sdavidxu 1977102898Sdavidxu mtx_assert(&sched_lock, MA_OWNED); 1978102898Sdavidxu p->p_suspcount++; 1979103216Sjulian TD_SET_SUSPENDED(td); 1980102898Sdavidxu TAILQ_INSERT_TAIL(&p->p_suspended, td, td_runq); 1981103216Sjulian /* 1982103216Sjulian * Hack: If we are suspending but are on the sleep queue 1983103216Sjulian * then we are in msleep or the cv equivalent. We 1984103216Sjulian * want to look like we have two Inhibitors. 1985105911Sjulian * May already be set.. doesn't matter. 1986103216Sjulian */ 1987103216Sjulian if (TD_ON_SLEEPQ(td)) 1988103216Sjulian TD_SET_SLEEPING(td); 1989102898Sdavidxu} 1990102898Sdavidxu 1991102898Sdavidxuvoid 1992102898Sdavidxuthread_unsuspend_one(struct thread *td) 1993102898Sdavidxu{ 1994102898Sdavidxu struct proc *p = td->td_proc; 1995102898Sdavidxu 1996102898Sdavidxu mtx_assert(&sched_lock, MA_OWNED); 1997102898Sdavidxu TAILQ_REMOVE(&p->p_suspended, td, td_runq); 1998103216Sjulian TD_CLR_SUSPENDED(td); 1999102898Sdavidxu p->p_suspcount--; 2000103216Sjulian setrunnable(td); 2001102898Sdavidxu} 2002102898Sdavidxu 200399026Sjulian/* 200499026Sjulian * Allow all threads blocked by single threading to continue running. 200599026Sjulian */ 200699026Sjulianvoid 200799026Sjulianthread_unsuspend(struct proc *p) 200899026Sjulian{ 200999026Sjulian struct thread *td; 201099026Sjulian 2011100646Sjulian mtx_assert(&sched_lock, MA_OWNED); 201299026Sjulian PROC_LOCK_ASSERT(p, MA_OWNED); 201399026Sjulian if (!P_SHOULDSTOP(p)) { 201499026Sjulian while (( td = TAILQ_FIRST(&p->p_suspended))) { 2015102898Sdavidxu thread_unsuspend_one(td); 201699026Sjulian } 2017102950Sdavidxu } else if ((P_SHOULDSTOP(p) == P_STOPPED_SINGLE) && 201899026Sjulian (p->p_numthreads == p->p_suspcount)) { 201999026Sjulian /* 202099026Sjulian * Stopping everything also did the job for the single 202199026Sjulian * threading request. Now we've downgraded to single-threaded, 202299026Sjulian * let it continue. 202399026Sjulian */ 2024102898Sdavidxu thread_unsuspend_one(p->p_singlethread); 202599026Sjulian } 202699026Sjulian} 202799026Sjulian 202899026Sjulianvoid 202999026Sjulianthread_single_end(void) 203099026Sjulian{ 203199026Sjulian struct thread *td; 203299026Sjulian struct proc *p; 203399026Sjulian 203499026Sjulian td = curthread; 203599026Sjulian p = td->td_proc; 203699026Sjulian PROC_LOCK_ASSERT(p, MA_OWNED); 2037102950Sdavidxu p->p_flag &= ~P_STOPPED_SINGLE; 203899026Sjulian p->p_singlethread = NULL; 2039102292Sjulian /* 2040102292Sjulian * If there are other threads they mey now run, 2041102292Sjulian * unless of course there is a blanket 'stop order' 2042102292Sjulian * on the process. The single threader must be allowed 2043102292Sjulian * to continue however as this is a bad place to stop. 2044102292Sjulian */ 2045102292Sjulian if ((p->p_numthreads != 1) && (!P_SHOULDSTOP(p))) { 2046102292Sjulian mtx_lock_spin(&sched_lock); 2047102292Sjulian while (( td = TAILQ_FIRST(&p->p_suspended))) { 2048103216Sjulian thread_unsuspend_one(td); 2049102292Sjulian } 2050102292Sjulian mtx_unlock_spin(&sched_lock); 2051102292Sjulian } 205299026Sjulian} 205399026Sjulian 2054102292Sjulian 2055