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/8.4/sys/kern/kern_thr.c 233815 2012-04-02 20:34:41Z jhb $");
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/resourcevar.h>
40 #include <sys/sched.h>
41 #include <sys/sysctl.h>
42 #include <sys/smp.h>
43 #include <sys/syscallsubr.h>
44 #include <sys/sysent.h>
45 #include <sys/systm.h>
46 #include <sys/sysproto.h>
47 #include <sys/signalvar.h>
48 #include <sys/sysctl.h>
49 #include <sys/ucontext.h>
50 #include <sys/thr.h>
51 #include <sys/rtprio.h>
52 #include <sys/umtx.h>
53 #include <sys/limits.h>
54
55 #include <machine/frame.h>
56
57 #include <security/audit/audit.h>
58
59 SYSCTL_NODE(_kern, OID_AUTO, threads, CTLFLAG_RW, 0, "thread allocation");
60
61 static int max_threads_per_proc = 1500;
62 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_per_proc, CTLFLAG_RW,
63 &max_threads_per_proc, 0, "Limit on threads per proc");
64
65 static int max_threads_hits;
66 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_hits, CTLFLAG_RD,
67 &max_threads_hits, 0, "");
68
69 #ifdef COMPAT_FREEBSD32
70
71 static inline int
72 suword_lwpid(void *addr, lwpid_t lwpid)
73 {
74 int error;
75
76 if (SV_CURPROC_FLAG(SV_LP64))
77 error = suword(addr, lwpid);
78 else
79 error = suword32(addr, lwpid);
80 return (error);
81 }
82
83 #else
84 #define suword_lwpid suword
85 #endif
86
87 static int create_thread(struct thread *td, mcontext_t *ctx,
88 void (*start_func)(void *), void *arg,
89 char *stack_base, size_t stack_size,
90 char *tls_base,
91 long *child_tid, long *parent_tid,
92 int flags, struct rtprio *rtp);
93
94 /*
95 * System call interface.
96 */
97 int
98 thr_create(struct thread *td, struct thr_create_args *uap)
99 /* ucontext_t *ctx, long *id, int flags */
100 {
101 ucontext_t ctx;
102 int error;
103
104 if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
105 return (error);
106
107 error = create_thread(td, &ctx.uc_mcontext, NULL, NULL,
108 NULL, 0, NULL, uap->id, NULL, uap->flags, NULL);
109 return (error);
110 }
111
112 int
113 thr_new(struct thread *td, struct thr_new_args *uap)
114 /* struct thr_param * */
115 {
116 struct thr_param param;
117 int error;
118
119 if (uap->param_size < 0 || uap->param_size > sizeof(param))
120 return (EINVAL);
121 bzero(¶m, sizeof(param));
122 if ((error = copyin(uap->param, ¶m, uap->param_size)))
123 return (error);
124 return (kern_thr_new(td, ¶m));
125 }
126
127 int
128 kern_thr_new(struct thread *td, struct thr_param *param)
129 {
130 struct rtprio rtp, *rtpp;
131 int error;
132
133 rtpp = NULL;
134 if (param->rtp != 0) {
135 error = copyin(param->rtp, &rtp, sizeof(struct rtprio));
136 if (error)
137 return (error);
138 rtpp = &rtp;
139 }
140 error = create_thread(td, NULL, param->start_func, param->arg,
141 param->stack_base, param->stack_size, param->tls_base,
142 param->child_tid, param->parent_tid, param->flags,
143 rtpp);
144 return (error);
145 }
146
147 static int
148 create_thread(struct thread *td, mcontext_t *ctx,
149 void (*start_func)(void *), void *arg,
150 char *stack_base, size_t stack_size,
151 char *tls_base,
152 long *child_tid, long *parent_tid,
153 int flags, struct rtprio *rtp)
154 {
155 stack_t stack;
156 struct thread *newtd;
157 struct proc *p;
158 int error;
159
160 p = td->td_proc;
161
162 /* Have race condition but it is cheap. */
163 if (p->p_numthreads >= max_threads_per_proc) {
164 ++max_threads_hits;
165 return (EPROCLIM);
166 }
167
168 if (rtp != NULL) {
169 switch(rtp->type) {
170 case RTP_PRIO_REALTIME:
171 case RTP_PRIO_FIFO:
172 /* Only root can set scheduler policy */
173 if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
174 return (EPERM);
175 if (rtp->prio > RTP_PRIO_MAX)
176 return (EINVAL);
177 break;
178 case RTP_PRIO_NORMAL:
179 rtp->prio = 0;
180 break;
181 default:
182 return (EINVAL);
183 }
184 }
185
186 /* Initialize our td */
187 newtd = thread_alloc(0);
188 if (newtd == NULL)
189 return (ENOMEM);
190
191 cpu_set_upcall(newtd, td);
192
193 /*
194 * Try the copyout as soon as we allocate the td so we don't
195 * have to tear things down in a failure case below.
196 * Here we copy out tid to two places, one for child and one
197 * for parent, because pthread can create a detached thread,
198 * if parent wants to safely access child tid, it has to provide
199 * its storage, because child thread may exit quickly and
200 * memory is freed before parent thread can access it.
201 */
202 if ((child_tid != NULL &&
203 suword_lwpid(child_tid, newtd->td_tid)) ||
204 (parent_tid != NULL &&
205 suword_lwpid(parent_tid, newtd->td_tid))) {
206 thread_free(newtd);
207 return (EFAULT);
208 }
209
210 bzero(&newtd->td_startzero,
211 __rangeof(struct thread, td_startzero, td_endzero));
212 bzero(&newtd->td_rux, sizeof(newtd->td_rux));
213 newtd->td_map_def_user = NULL;
214 newtd->td_dbg_forked = 0;
215 bcopy(&td->td_startcopy, &newtd->td_startcopy,
216 __rangeof(struct thread, td_startcopy, td_endcopy));
217 newtd->td_proc = td->td_proc;
218 newtd->td_ucred = crhold(td->td_ucred);
219
220 if (ctx != NULL) { /* old way to set user context */
221 error = set_mcontext(newtd, ctx);
222 if (error != 0) {
223 thread_free(newtd);
224 crfree(td->td_ucred);
225 return (error);
226 }
227 } else {
228 /* Set up our machine context. */
229 stack.ss_sp = stack_base;
230 stack.ss_size = stack_size;
231 /* Set upcall address to user thread entry function. */
232 cpu_set_upcall_kse(newtd, start_func, arg, &stack);
233 /* Setup user TLS address and TLS pointer register. */
234 error = cpu_set_user_tls(newtd, tls_base);
235 if (error != 0) {
236 thread_free(newtd);
237 crfree(td->td_ucred);
238 return (error);
239 }
240 }
241
242 PROC_LOCK(td->td_proc);
243 td->td_proc->p_flag |= P_HADTHREADS;
244 newtd->td_sigmask = td->td_sigmask;
245 thread_link(newtd, p);
246 bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
247 thread_lock(td);
248 /* let the scheduler know about these things. */
249 sched_fork_thread(td, newtd);
250 thread_unlock(td);
251 if (P_SHOULDSTOP(p))
252 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
253 PROC_UNLOCK(p);
254 thread_lock(newtd);
255 if (rtp != NULL) {
256 if (!(td->td_pri_class == PRI_TIMESHARE &&
257 rtp->type == RTP_PRIO_NORMAL)) {
258 rtp_to_pri(rtp, newtd);
259 sched_prio(newtd, newtd->td_user_pri);
260 } /* ignore timesharing class */
261 }
262 TD_SET_CAN_RUN(newtd);
263 sched_add(newtd, SRQ_BORING);
264 thread_unlock(newtd);
265
266 return (0);
267 }
268
269 int
270 thr_self(struct thread *td, struct thr_self_args *uap)
271 /* long *id */
272 {
273 int error;
274
275 error = suword_lwpid(uap->id, (unsigned)td->td_tid);
276 if (error == -1)
277 return (EFAULT);
278 return (0);
279 }
280
281 int
282 thr_exit(struct thread *td, struct thr_exit_args *uap)
283 /* long *state */
284 {
285 struct proc *p;
286
287 p = td->td_proc;
288
289 /* Signal userland that it can free the stack. */
290 if ((void *)uap->state != NULL) {
291 suword_lwpid(uap->state, 1);
292 kern_umtx_wake(td, uap->state, INT_MAX, 0);
293 }
294
295 PROC_LOCK(p);
296 tdsigcleanup(td);
297 PROC_SLOCK(p);
298
299 /*
300 * Shutting down last thread in the proc. This will actually
301 * call exit() in the trampoline when it returns.
302 */
303 if (p->p_numthreads != 1) {
304 thread_stopped(p);
305 thread_exit();
306 /* NOTREACHED */
307 }
308 PROC_SUNLOCK(p);
309 PROC_UNLOCK(p);
310 return (0);
311 }
312
313 int
314 thr_kill(struct thread *td, struct thr_kill_args *uap)
315 /* long id, int sig */
316 {
317 ksiginfo_t ksi;
318 struct thread *ttd;
319 struct proc *p;
320 int error;
321
322 p = td->td_proc;
323 error = 0;
324 ksiginfo_init(&ksi);
325 ksi.ksi_signo = uap->sig;
326 ksi.ksi_code = SI_USER;
327 ksi.ksi_pid = p->p_pid;
328 ksi.ksi_uid = td->td_ucred->cr_ruid;
329 PROC_LOCK(p);
330 if (uap->id == -1) {
331 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
332 error = EINVAL;
333 } else {
334 error = ESRCH;
335 FOREACH_THREAD_IN_PROC(p, ttd) {
336 if (ttd != td) {
337 error = 0;
338 if (uap->sig == 0)
339 break;
340 tdsignal(p, ttd, uap->sig, &ksi);
341 }
342 }
343 }
344 } else {
345 if (uap->id != td->td_tid)
346 ttd = thread_find(p, uap->id);
347 else
348 ttd = td;
349 if (ttd == NULL)
350 error = ESRCH;
351 else if (uap->sig == 0)
352 ;
353 else if (!_SIG_VALID(uap->sig))
354 error = EINVAL;
355 else
356 tdsignal(p, ttd, uap->sig, &ksi);
357 }
358 PROC_UNLOCK(p);
359 return (error);
360 }
361
362 int
363 thr_kill2(struct thread *td, struct thr_kill2_args *uap)
364 /* pid_t pid, long id, int sig */
365 {
366 ksiginfo_t ksi;
367 struct thread *ttd;
368 struct proc *p;
369 int error;
370
371 AUDIT_ARG_SIGNUM(uap->sig);
372
373 if (uap->pid == td->td_proc->p_pid) {
374 p = td->td_proc;
375 PROC_LOCK(p);
376 } else if ((p = pfind(uap->pid)) == NULL) {
377 return (ESRCH);
378 }
379 AUDIT_ARG_PROCESS(p);
380
381 error = p_cansignal(td, p, uap->sig);
382 if (error == 0) {
383 ksiginfo_init(&ksi);
384 ksi.ksi_signo = uap->sig;
385 ksi.ksi_code = SI_USER;
386 ksi.ksi_pid = td->td_proc->p_pid;
387 ksi.ksi_uid = td->td_ucred->cr_ruid;
388 if (uap->id == -1) {
389 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
390 error = EINVAL;
391 } else {
392 error = ESRCH;
393 FOREACH_THREAD_IN_PROC(p, ttd) {
394 if (ttd != td) {
395 error = 0;
396 if (uap->sig == 0)
397 break;
398 tdsignal(p, ttd, uap->sig,
399 &ksi);
400 }
401 }
402 }
403 } else {
404 if (uap->id != td->td_tid)
405 ttd = thread_find(p, uap->id);
406 else
407 ttd = td;
408 if (ttd == NULL)
409 error = ESRCH;
410 else if (uap->sig == 0)
411 ;
412 else if (!_SIG_VALID(uap->sig))
413 error = EINVAL;
414 else
415 tdsignal(p, ttd, uap->sig, &ksi);
416 }
417 }
418 PROC_UNLOCK(p);
419 return (error);
420 }
421
422 int
423 thr_suspend(struct thread *td, struct thr_suspend_args *uap)
424 /* const struct timespec *timeout */
425 {
426 struct timespec ts, *tsp;
427 int error;
428
429 tsp = NULL;
430 if (uap->timeout != NULL) {
431 error = umtx_copyin_timeout(uap->timeout, &ts);
432 if (error != 0)
433 return (error);
434 tsp = &ts;
435 }
436
437 return (kern_thr_suspend(td, tsp));
438 }
439
440 int
441 kern_thr_suspend(struct thread *td, struct timespec *tsp)
442 {
443 struct timeval tv;
444 int error = 0, hz = 0;
445
446 if (tsp != NULL) {
447 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
448 return (ETIMEDOUT);
449 TIMESPEC_TO_TIMEVAL(&tv, tsp);
450 hz = tvtohz(&tv);
451 }
452
453 if (td->td_pflags & TDP_WAKEUP) {
454 td->td_pflags &= ~TDP_WAKEUP;
455 return (0);
456 }
457
458 PROC_LOCK(td->td_proc);
459 if ((td->td_flags & TDF_THRWAKEUP) == 0)
460 error = msleep((void *)td, &td->td_proc->p_mtx, PCATCH, "lthr",
461 hz);
462 if (td->td_flags & TDF_THRWAKEUP) {
463 thread_lock(td);
464 td->td_flags &= ~TDF_THRWAKEUP;
465 thread_unlock(td);
466 PROC_UNLOCK(td->td_proc);
467 return (0);
468 }
469 PROC_UNLOCK(td->td_proc);
470 if (error == EWOULDBLOCK)
471 error = ETIMEDOUT;
472 else if (error == ERESTART) {
473 if (hz != 0)
474 error = EINTR;
475 }
476 return (error);
477 }
478
479 int
480 thr_wake(struct thread *td, struct thr_wake_args *uap)
481 /* long id */
482 {
483 struct proc *p;
484 struct thread *ttd;
485
486 if (uap->id == td->td_tid) {
487 td->td_pflags |= TDP_WAKEUP;
488 return (0);
489 }
490
491 p = td->td_proc;
492 PROC_LOCK(p);
493 ttd = thread_find(p, uap->id);
494 if (ttd == NULL) {
495 PROC_UNLOCK(p);
496 return (ESRCH);
497 }
498 thread_lock(ttd);
499 ttd->td_flags |= TDF_THRWAKEUP;
500 thread_unlock(ttd);
501 wakeup((void *)ttd);
502 PROC_UNLOCK(p);
503 return (0);
504 }
505
506 int
507 thr_set_name(struct thread *td, struct thr_set_name_args *uap)
508 {
509 struct proc *p = td->td_proc;
510 char name[MAXCOMLEN + 1];
511 struct thread *ttd;
512 int error;
513
514 error = 0;
515 name[0] = '\0';
516 if (uap->name != NULL) {
517 error = copyinstr(uap->name, name, sizeof(name),
518 NULL);
519 if (error)
520 return (error);
521 }
522 PROC_LOCK(p);
523 if (uap->id == td->td_tid)
524 ttd = td;
525 else
526 ttd = thread_find(p, uap->id);
527 if (ttd != NULL)
528 strcpy(ttd->td_name, name);
529 else
530 error = ESRCH;
531 #ifdef KTR
532 sched_clear_tdname(ttd);
533 #endif
534 PROC_UNLOCK(p);
535 return (error);
536 }
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