kern_thr.c revision 127739
1/* 2 * Copyright (c) 2003, Jeffrey Roberson <jeff@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/kern/kern_thr.c 127739 2004-04-02 04:57:40Z kris $"); 29 30#include <sys/param.h> 31#include <sys/kernel.h> 32#include <sys/lock.h> 33#include <sys/mutex.h> 34#include <sys/proc.h> 35#include <sys/resourcevar.h> 36#include <sys/sched.h> 37#include <sys/sysent.h> 38#include <sys/systm.h> 39#include <sys/sysproto.h> 40#include <sys/signalvar.h> 41#include <sys/ucontext.h> 42#include <sys/thr.h> 43 44#include <machine/frame.h> 45 46/* 47 * Back end support functions. 48 */ 49 50void 51thr_exit1(void) 52{ 53 struct ksegrp *kg; 54 struct thread *td; 55 struct kse *ke; 56 struct proc *p; 57 58 td = curthread; 59 p = td->td_proc; 60 kg = td->td_ksegrp; 61 ke = td->td_kse; 62 63 mtx_assert(&sched_lock, MA_OWNED); 64 PROC_LOCK_ASSERT(p, MA_OWNED); 65 KASSERT(!mtx_owned(&Giant), ("dying thread owns giant")); 66 67 /* 68 * Shutting down last thread in the proc. This will actually 69 * call exit() in the trampoline when it returns. 70 */ 71 if (p->p_numthreads == 1) { 72 PROC_UNLOCK(p); 73 return; 74 } 75 76 /* 77 * XXX Undelivered process wide signals should be reposted to the 78 * proc. 79 */ 80 81 /* Clean up cpu resources. */ 82 cpu_thread_exit(td); 83 84 /* Unlink the thread from the process and kseg. */ 85 thread_unlink(td); 86 87 ke->ke_state = KES_UNQUEUED; 88 ke->ke_thread = NULL; 89 kse_unlink(ke); 90 sched_exit_kse(TAILQ_NEXT(ke, ke_kglist), ke); 91 92 /* 93 * If we were stopped while waiting for all threads to exit and this 94 * is the last thread wakeup the exiting thread. 95 */ 96 if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) 97 if (p->p_numthreads == 1) 98 thread_unsuspend_one(p->p_singlethread); 99 100 PROC_UNLOCK(p); 101 td->td_kse = NULL; 102 td->td_state = TDS_INACTIVE; 103#if 0 104 td->td_proc = NULL; 105#endif 106 td->td_ksegrp = NULL; 107 td->td_last_kse = NULL; 108 sched_exit_thread(TAILQ_NEXT(td, td_kglist), td); 109 thread_stash(td); 110 111 cpu_throw(td, choosethread()); 112} 113 114#define RANGEOF(type, start, end) (offsetof(type, end) - offsetof(type, start)) 115 116/* 117 * System call interface. 118 */ 119int 120thr_create(struct thread *td, struct thr_create_args *uap) 121 /* ucontext_t *ctx, thr_id_t *id, int flags */ 122{ 123 struct kse *ke0; 124 struct thread *td0; 125 ucontext_t ctx; 126 int error; 127 128 if ((error = copyin(uap->ctx, &ctx, sizeof(ctx)))) 129 return (error); 130 131 /* Initialize our td. */ 132 td0 = thread_alloc(); 133 134 /* 135 * Try the copyout as soon as we allocate the td so we don't have to 136 * tear things down in a failure case below. 137 */ 138 if ((error = copyout(&td0, uap->id, sizeof(thr_id_t)))) { 139 thread_free(td0); 140 return (error); 141 } 142 143 bzero(&td0->td_startzero, 144 (unsigned)RANGEOF(struct thread, td_startzero, td_endzero)); 145 bcopy(&td->td_startcopy, &td0->td_startcopy, 146 (unsigned) RANGEOF(struct thread, td_startcopy, td_endcopy)); 147 148 td0->td_proc = td->td_proc; 149 PROC_LOCK(td->td_proc); 150 td0->td_sigmask = td->td_sigmask; 151 PROC_UNLOCK(td->td_proc); 152 td0->td_ucred = crhold(td->td_ucred); 153 154 /* Initialize our kse structure. */ 155 ke0 = kse_alloc(); 156 bzero(&ke0->ke_startzero, 157 RANGEOF(struct kse, ke_startzero, ke_endzero)); 158 159 /* Set up our machine context. */ 160 cpu_set_upcall(td0, td); 161 error = set_mcontext(td0, &ctx.uc_mcontext); 162 if (error != 0) { 163 kse_free(ke0); 164 thread_free(td0); 165 goto out; 166 } 167 168 /* Link the thread and kse into the ksegrp and make it runnable. */ 169 mtx_lock_spin(&sched_lock); 170 171 thread_link(td0, td->td_ksegrp); 172 kse_link(ke0, td->td_ksegrp); 173 174 /* Bind this thread and kse together. */ 175 td0->td_kse = ke0; 176 ke0->ke_thread = td0; 177 178 sched_fork_kse(td->td_kse, ke0); 179 sched_fork_thread(td, td0); 180 181 TD_SET_CAN_RUN(td0); 182 if ((uap->flags & THR_SUSPENDED) == 0) 183 setrunqueue(td0); 184 185 mtx_unlock_spin(&sched_lock); 186 187out: 188 return (error); 189} 190 191int 192thr_self(struct thread *td, struct thr_self_args *uap) 193 /* thr_id_t *id */ 194{ 195 int error; 196 197 if ((error = copyout(&td, uap->id, sizeof(thr_id_t)))) 198 return (error); 199 200 return (0); 201} 202 203int 204thr_exit(struct thread *td, struct thr_exit_args *uap) 205 /* NULL */ 206{ 207 struct proc *p; 208 209 p = td->td_proc; 210 211 PROC_LOCK(p); 212 mtx_lock_spin(&sched_lock); 213 214 /* 215 * This unlocks proc and doesn't return unless this is the last 216 * thread. 217 */ 218 thr_exit1(); 219 mtx_unlock_spin(&sched_lock); 220 221 return (0); 222} 223 224int 225thr_kill(struct thread *td, struct thr_kill_args *uap) 226 /* thr_id_t id, int sig */ 227{ 228 struct thread *ttd; 229 struct proc *p; 230 int error; 231 232 p = td->td_proc; 233 error = 0; 234 PROC_LOCK(p); 235 FOREACH_THREAD_IN_PROC(p, ttd) { 236 if (ttd == uap->id) 237 break; 238 } 239 if (ttd == NULL) { 240 error = ESRCH; 241 goto out; 242 } 243 if (uap->sig == 0) 244 goto out; 245 if (!_SIG_VALID(uap->sig)) { 246 error = EINVAL; 247 goto out; 248 } 249 tdsignal(ttd, uap->sig, SIGTARGET_TD); 250out: 251 PROC_UNLOCK(p); 252 return (error); 253} 254 255int 256thr_suspend(struct thread *td, struct thr_suspend_args *uap) 257 /* const struct timespec *timeout */ 258{ 259 struct timespec ts; 260 struct timeval tv; 261 int error; 262 int hz; 263 264 hz = 0; 265 error = 0; 266 if (uap->timeout != NULL) { 267 error = copyin((const void *)uap->timeout, (void *)&ts, 268 sizeof(struct timespec)); 269 if (error != 0) 270 return (error); 271 if (ts.tv_nsec < 0 || ts.tv_nsec > 1000000000) 272 return (EINVAL); 273 if (ts.tv_sec == 0 && ts.tv_nsec == 0) 274 return (ETIMEDOUT); 275 TIMESPEC_TO_TIMEVAL(&tv, &ts); 276 hz = tvtohz(&tv); 277 } 278 PROC_LOCK(td->td_proc); 279 mtx_lock_spin(&sched_lock); 280 if ((td->td_flags & TDF_THRWAKEUP) == 0) { 281 mtx_unlock_spin(&sched_lock); 282 error = msleep((void *)td, &td->td_proc->p_mtx, 283 td->td_priority | PCATCH, "lthr", hz); 284 mtx_lock_spin(&sched_lock); 285 } 286 td->td_flags &= ~TDF_THRWAKEUP; 287 mtx_unlock_spin(&sched_lock); 288 PROC_UNLOCK(td->td_proc); 289 return (error == EWOULDBLOCK ? ETIMEDOUT : error); 290} 291 292int 293thr_wake(struct thread *td, struct thr_wake_args *uap) 294 /* thr_id_t id */ 295{ 296 struct thread *tdsleeper, *ttd; 297 298 tdsleeper = ((struct thread *)uap->id); 299 PROC_LOCK(tdsleeper->td_proc); 300 FOREACH_THREAD_IN_PROC(tdsleeper->td_proc, ttd) { 301 if (ttd == tdsleeper) 302 break; 303 } 304 if (ttd == NULL) { 305 PROC_UNLOCK(tdsleeper->td_proc); 306 return (ESRCH); 307 } 308 mtx_lock_spin(&sched_lock); 309 tdsleeper->td_flags |= TDF_THRWAKEUP; 310 mtx_unlock_spin(&sched_lock); 311 wakeup_one((void *)tdsleeper); 312 PROC_UNLOCK(tdsleeper->td_proc); 313 return (0); 314} 315