FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_thr.c
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: releng/10.0/sys/kern/kern_thr.c 236117 2012-05-26 20:03:47Z kib $");
29
30 #include "opt_compat.h"
31 #include "opt_posix.h"
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/lock.h>
35 #include <sys/mutex.h>
36 #include <sys/priv.h>
37 #include <sys/proc.h>
38 #include <sys/posix4.h>
39 #include <sys/racct.h>
40 #include <sys/resourcevar.h>
41 #include <sys/rwlock.h>
42 #include <sys/sched.h>
43 #include <sys/sysctl.h>
44 #include <sys/smp.h>
45 #include <sys/syscallsubr.h>
46 #include <sys/sysent.h>
47 #include <sys/systm.h>
48 #include <sys/sysproto.h>
49 #include <sys/signalvar.h>
50 #include <sys/sysctl.h>
51 #include <sys/ucontext.h>
52 #include <sys/thr.h>
53 #include <sys/rtprio.h>
54 #include <sys/umtx.h>
55 #include <sys/limits.h>
56
57 #include <machine/frame.h>
58
59 #include <security/audit/audit.h>
60
61 static SYSCTL_NODE(_kern, OID_AUTO, threads, CTLFLAG_RW, 0,
62 "thread allocation");
63
64 static int max_threads_per_proc = 1500;
65 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_per_proc, CTLFLAG_RW,
66 &max_threads_per_proc, 0, "Limit on threads per proc");
67
68 static int max_threads_hits;
69 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_hits, CTLFLAG_RD,
70 &max_threads_hits, 0, "kern.threads.max_threads_per_proc hit count");
71
72 #ifdef COMPAT_FREEBSD32
73
74 static inline int
75 suword_lwpid(void *addr, lwpid_t lwpid)
76 {
77 int error;
78
79 if (SV_CURPROC_FLAG(SV_LP64))
80 error = suword(addr, lwpid);
81 else
82 error = suword32(addr, lwpid);
83 return (error);
84 }
85
86 #else
87 #define suword_lwpid suword
88 #endif
89
90 static int create_thread(struct thread *td, mcontext_t *ctx,
91 void (*start_func)(void *), void *arg,
92 char *stack_base, size_t stack_size,
93 char *tls_base,
94 long *child_tid, long *parent_tid,
95 int flags, struct rtprio *rtp);
96
97 /*
98 * System call interface.
99 */
100 int
101 sys_thr_create(struct thread *td, struct thr_create_args *uap)
102 /* ucontext_t *ctx, long *id, int flags */
103 {
104 ucontext_t ctx;
105 int error;
106
107 if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
108 return (error);
109
110 error = create_thread(td, &ctx.uc_mcontext, NULL, NULL,
111 NULL, 0, NULL, uap->id, NULL, uap->flags, NULL);
112 return (error);
113 }
114
115 int
116 sys_thr_new(struct thread *td, struct thr_new_args *uap)
117 /* struct thr_param * */
118 {
119 struct thr_param param;
120 int error;
121
122 if (uap->param_size < 0 || uap->param_size > sizeof(param))
123 return (EINVAL);
124 bzero(¶m, sizeof(param));
125 if ((error = copyin(uap->param, ¶m, uap->param_size)))
126 return (error);
127 return (kern_thr_new(td, ¶m));
128 }
129
130 int
131 kern_thr_new(struct thread *td, struct thr_param *param)
132 {
133 struct rtprio rtp, *rtpp;
134 int error;
135
136 rtpp = NULL;
137 if (param->rtp != 0) {
138 error = copyin(param->rtp, &rtp, sizeof(struct rtprio));
139 if (error)
140 return (error);
141 rtpp = &rtp;
142 }
143 error = create_thread(td, NULL, param->start_func, param->arg,
144 param->stack_base, param->stack_size, param->tls_base,
145 param->child_tid, param->parent_tid, param->flags,
146 rtpp);
147 return (error);
148 }
149
150 static int
151 create_thread(struct thread *td, mcontext_t *ctx,
152 void (*start_func)(void *), void *arg,
153 char *stack_base, size_t stack_size,
154 char *tls_base,
155 long *child_tid, long *parent_tid,
156 int flags, struct rtprio *rtp)
157 {
158 stack_t stack;
159 struct thread *newtd;
160 struct proc *p;
161 int error;
162
163 p = td->td_proc;
164
165 /* Have race condition but it is cheap. */
166 if (p->p_numthreads >= max_threads_per_proc) {
167 ++max_threads_hits;
168 return (EPROCLIM);
169 }
170
171 if (rtp != NULL) {
172 switch(rtp->type) {
173 case RTP_PRIO_REALTIME:
174 case RTP_PRIO_FIFO:
175 /* Only root can set scheduler policy */
176 if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
177 return (EPERM);
178 if (rtp->prio > RTP_PRIO_MAX)
179 return (EINVAL);
180 break;
181 case RTP_PRIO_NORMAL:
182 rtp->prio = 0;
183 break;
184 default:
185 return (EINVAL);
186 }
187 }
188
189 #ifdef RACCT
190 PROC_LOCK(td->td_proc);
191 error = racct_add(p, RACCT_NTHR, 1);
192 PROC_UNLOCK(td->td_proc);
193 if (error != 0)
194 return (EPROCLIM);
195 #endif
196
197 /* Initialize our td */
198 newtd = thread_alloc(0);
199 if (newtd == NULL) {
200 error = ENOMEM;
201 goto fail;
202 }
203
204 cpu_set_upcall(newtd, td);
205
206 /*
207 * Try the copyout as soon as we allocate the td so we don't
208 * have to tear things down in a failure case below.
209 * Here we copy out tid to two places, one for child and one
210 * for parent, because pthread can create a detached thread,
211 * if parent wants to safely access child tid, it has to provide
212 * its storage, because child thread may exit quickly and
213 * memory is freed before parent thread can access it.
214 */
215 if ((child_tid != NULL &&
216 suword_lwpid(child_tid, newtd->td_tid)) ||
217 (parent_tid != NULL &&
218 suword_lwpid(parent_tid, newtd->td_tid))) {
219 thread_free(newtd);
220 error = EFAULT;
221 goto fail;
222 }
223
224 bzero(&newtd->td_startzero,
225 __rangeof(struct thread, td_startzero, td_endzero));
226 bcopy(&td->td_startcopy, &newtd->td_startcopy,
227 __rangeof(struct thread, td_startcopy, td_endcopy));
228 newtd->td_proc = td->td_proc;
229 newtd->td_ucred = crhold(td->td_ucred);
230
231 if (ctx != NULL) { /* old way to set user context */
232 error = set_mcontext(newtd, ctx);
233 if (error != 0) {
234 thread_free(newtd);
235 crfree(td->td_ucred);
236 goto fail;
237 }
238 } else {
239 /* Set up our machine context. */
240 stack.ss_sp = stack_base;
241 stack.ss_size = stack_size;
242 /* Set upcall address to user thread entry function. */
243 cpu_set_upcall_kse(newtd, start_func, arg, &stack);
244 /* Setup user TLS address and TLS pointer register. */
245 error = cpu_set_user_tls(newtd, tls_base);
246 if (error != 0) {
247 thread_free(newtd);
248 crfree(td->td_ucred);
249 goto fail;
250 }
251 }
252
253 PROC_LOCK(td->td_proc);
254 td->td_proc->p_flag |= P_HADTHREADS;
255 thread_link(newtd, p);
256 bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
257 thread_lock(td);
258 /* let the scheduler know about these things. */
259 sched_fork_thread(td, newtd);
260 thread_unlock(td);
261 if (P_SHOULDSTOP(p))
262 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
263 PROC_UNLOCK(p);
264
265 tidhash_add(newtd);
266
267 thread_lock(newtd);
268 if (rtp != NULL) {
269 if (!(td->td_pri_class == PRI_TIMESHARE &&
270 rtp->type == RTP_PRIO_NORMAL)) {
271 rtp_to_pri(rtp, newtd);
272 sched_prio(newtd, newtd->td_user_pri);
273 } /* ignore timesharing class */
274 }
275 TD_SET_CAN_RUN(newtd);
276 sched_add(newtd, SRQ_BORING);
277 thread_unlock(newtd);
278
279 return (0);
280
281 fail:
282 #ifdef RACCT
283 PROC_LOCK(p);
284 racct_sub(p, RACCT_NTHR, 1);
285 PROC_UNLOCK(p);
286 #endif
287 return (error);
288 }
289
290 int
291 sys_thr_self(struct thread *td, struct thr_self_args *uap)
292 /* long *id */
293 {
294 int error;
295
296 error = suword_lwpid(uap->id, (unsigned)td->td_tid);
297 if (error == -1)
298 return (EFAULT);
299 return (0);
300 }
301
302 int
303 sys_thr_exit(struct thread *td, struct thr_exit_args *uap)
304 /* long *state */
305 {
306 struct proc *p;
307
308 p = td->td_proc;
309
310 /* Signal userland that it can free the stack. */
311 if ((void *)uap->state != NULL) {
312 suword_lwpid(uap->state, 1);
313 kern_umtx_wake(td, uap->state, INT_MAX, 0);
314 }
315
316 rw_wlock(&tidhash_lock);
317
318 PROC_LOCK(p);
319
320 /*
321 * Shutting down last thread in the proc. This will actually
322 * call exit() in the trampoline when it returns.
323 */
324 if (p->p_numthreads != 1) {
325 racct_sub(p, RACCT_NTHR, 1);
326 LIST_REMOVE(td, td_hash);
327 rw_wunlock(&tidhash_lock);
328 tdsigcleanup(td);
329 PROC_SLOCK(p);
330 thread_stopped(p);
331 thread_exit();
332 /* NOTREACHED */
333 }
334 PROC_UNLOCK(p);
335 rw_wunlock(&tidhash_lock);
336 return (0);
337 }
338
339 int
340 sys_thr_kill(struct thread *td, struct thr_kill_args *uap)
341 /* long id, int sig */
342 {
343 ksiginfo_t ksi;
344 struct thread *ttd;
345 struct proc *p;
346 int error;
347
348 p = td->td_proc;
349 ksiginfo_init(&ksi);
350 ksi.ksi_signo = uap->sig;
351 ksi.ksi_code = SI_LWP;
352 ksi.ksi_pid = p->p_pid;
353 ksi.ksi_uid = td->td_ucred->cr_ruid;
354 if (uap->id == -1) {
355 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
356 error = EINVAL;
357 } else {
358 error = ESRCH;
359 PROC_LOCK(p);
360 FOREACH_THREAD_IN_PROC(p, ttd) {
361 if (ttd != td) {
362 error = 0;
363 if (uap->sig == 0)
364 break;
365 tdksignal(ttd, uap->sig, &ksi);
366 }
367 }
368 PROC_UNLOCK(p);
369 }
370 } else {
371 error = 0;
372 ttd = tdfind((lwpid_t)uap->id, p->p_pid);
373 if (ttd == NULL)
374 return (ESRCH);
375 if (uap->sig == 0)
376 ;
377 else if (!_SIG_VALID(uap->sig))
378 error = EINVAL;
379 else
380 tdksignal(ttd, uap->sig, &ksi);
381 PROC_UNLOCK(ttd->td_proc);
382 }
383 return (error);
384 }
385
386 int
387 sys_thr_kill2(struct thread *td, struct thr_kill2_args *uap)
388 /* pid_t pid, long id, int sig */
389 {
390 ksiginfo_t ksi;
391 struct thread *ttd;
392 struct proc *p;
393 int error;
394
395 AUDIT_ARG_SIGNUM(uap->sig);
396
397 ksiginfo_init(&ksi);
398 ksi.ksi_signo = uap->sig;
399 ksi.ksi_code = SI_LWP;
400 ksi.ksi_pid = td->td_proc->p_pid;
401 ksi.ksi_uid = td->td_ucred->cr_ruid;
402 if (uap->id == -1) {
403 if ((p = pfind(uap->pid)) == NULL)
404 return (ESRCH);
405 AUDIT_ARG_PROCESS(p);
406 error = p_cansignal(td, p, uap->sig);
407 if (error) {
408 PROC_UNLOCK(p);
409 return (error);
410 }
411 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
412 error = EINVAL;
413 } else {
414 error = ESRCH;
415 FOREACH_THREAD_IN_PROC(p, ttd) {
416 if (ttd != td) {
417 error = 0;
418 if (uap->sig == 0)
419 break;
420 tdksignal(ttd, uap->sig, &ksi);
421 }
422 }
423 }
424 PROC_UNLOCK(p);
425 } else {
426 ttd = tdfind((lwpid_t)uap->id, uap->pid);
427 if (ttd == NULL)
428 return (ESRCH);
429 p = ttd->td_proc;
430 AUDIT_ARG_PROCESS(p);
431 error = p_cansignal(td, p, uap->sig);
432 if (uap->sig == 0)
433 ;
434 else if (!_SIG_VALID(uap->sig))
435 error = EINVAL;
436 else
437 tdksignal(ttd, uap->sig, &ksi);
438 PROC_UNLOCK(p);
439 }
440 return (error);
441 }
442
443 int
444 sys_thr_suspend(struct thread *td, struct thr_suspend_args *uap)
445 /* const struct timespec *timeout */
446 {
447 struct timespec ts, *tsp;
448 int error;
449
450 tsp = NULL;
451 if (uap->timeout != NULL) {
452 error = umtx_copyin_timeout(uap->timeout, &ts);
453 if (error != 0)
454 return (error);
455 tsp = &ts;
456 }
457
458 return (kern_thr_suspend(td, tsp));
459 }
460
461 int
462 kern_thr_suspend(struct thread *td, struct timespec *tsp)
463 {
464 struct proc *p = td->td_proc;
465 struct timeval tv;
466 int error = 0;
467 int timo = 0;
468
469 if (td->td_pflags & TDP_WAKEUP) {
470 td->td_pflags &= ~TDP_WAKEUP;
471 return (0);
472 }
473
474 if (tsp != NULL) {
475 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
476 error = EWOULDBLOCK;
477 else {
478 TIMESPEC_TO_TIMEVAL(&tv, tsp);
479 timo = tvtohz(&tv);
480 }
481 }
482
483 PROC_LOCK(p);
484 if (error == 0 && (td->td_flags & TDF_THRWAKEUP) == 0)
485 error = msleep((void *)td, &p->p_mtx,
486 PCATCH, "lthr", timo);
487
488 if (td->td_flags & TDF_THRWAKEUP) {
489 thread_lock(td);
490 td->td_flags &= ~TDF_THRWAKEUP;
491 thread_unlock(td);
492 PROC_UNLOCK(p);
493 return (0);
494 }
495 PROC_UNLOCK(p);
496 if (error == EWOULDBLOCK)
497 error = ETIMEDOUT;
498 else if (error == ERESTART) {
499 if (timo != 0)
500 error = EINTR;
501 }
502 return (error);
503 }
504
505 int
506 sys_thr_wake(struct thread *td, struct thr_wake_args *uap)
507 /* long id */
508 {
509 struct proc *p;
510 struct thread *ttd;
511
512 if (uap->id == td->td_tid) {
513 td->td_pflags |= TDP_WAKEUP;
514 return (0);
515 }
516
517 p = td->td_proc;
518 ttd = tdfind((lwpid_t)uap->id, p->p_pid);
519 if (ttd == NULL)
520 return (ESRCH);
521 thread_lock(ttd);
522 ttd->td_flags |= TDF_THRWAKEUP;
523 thread_unlock(ttd);
524 wakeup((void *)ttd);
525 PROC_UNLOCK(p);
526 return (0);
527 }
528
529 int
530 sys_thr_set_name(struct thread *td, struct thr_set_name_args *uap)
531 {
532 struct proc *p;
533 char name[MAXCOMLEN + 1];
534 struct thread *ttd;
535 int error;
536
537 error = 0;
538 name[0] = '\0';
539 if (uap->name != NULL) {
540 error = copyinstr(uap->name, name, sizeof(name),
541 NULL);
542 if (error)
543 return (error);
544 }
545 p = td->td_proc;
546 ttd = tdfind((lwpid_t)uap->id, p->p_pid);
547 if (ttd == NULL)
548 return (ESRCH);
549 strcpy(ttd->td_name, name);
550 #ifdef KTR
551 sched_clear_tdname(ttd);
552 #endif
553 PROC_UNLOCK(p);
554 return (error);
555 }
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