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/7.3/sys/kern/kern_thr.c 192493 2009-05-20 22:30:57Z kmacy $");
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/ucontext.h>
49 #include <sys/thr.h>
50 #include <sys/rtprio.h>
51 #include <sys/umtx.h>
52 #include <sys/limits.h>
53
54 #include <machine/frame.h>
55
56 #include <security/audit/audit.h>
57
58 #ifdef COMPAT_IA32
59
60 extern struct sysentvec ia32_freebsd_sysvec;
61
62 static inline int
63 suword_lwpid(void *addr, lwpid_t lwpid)
64 {
65 int error;
66
67 if (curproc->p_sysent != &ia32_freebsd_sysvec)
68 error = suword(addr, lwpid);
69 else
70 error = suword32(addr, lwpid);
71 return (error);
72 }
73
74 #else
75 #define suword_lwpid suword
76 #endif
77
78 extern int max_threads_per_proc;
79
80 static int create_thread(struct thread *td, mcontext_t *ctx,
81 void (*start_func)(void *), void *arg,
82 char *stack_base, size_t stack_size,
83 char *tls_base,
84 long *child_tid, long *parent_tid,
85 int flags, struct rtprio *rtp);
86
87 /*
88 * System call interface.
89 */
90 int
91 thr_create(struct thread *td, struct thr_create_args *uap)
92 /* ucontext_t *ctx, long *id, int flags */
93 {
94 ucontext_t ctx;
95 int error;
96
97 if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
98 return (error);
99
100 error = create_thread(td, &ctx.uc_mcontext, NULL, NULL,
101 NULL, 0, NULL, uap->id, NULL, uap->flags, NULL);
102 return (error);
103 }
104
105 int
106 thr_new(struct thread *td, struct thr_new_args *uap)
107 /* struct thr_param * */
108 {
109 struct thr_param param;
110 int error;
111
112 if (uap->param_size < 0 || uap->param_size > sizeof(param))
113 return (EINVAL);
114 bzero(¶m, sizeof(param));
115 if ((error = copyin(uap->param, ¶m, uap->param_size)))
116 return (error);
117 return (kern_thr_new(td, ¶m));
118 }
119
120 int
121 kern_thr_new(struct thread *td, struct thr_param *param)
122 {
123 struct rtprio rtp, *rtpp;
124 int error;
125
126 rtpp = NULL;
127 if (param->rtp != 0) {
128 error = copyin(param->rtp, &rtp, sizeof(struct rtprio));
129 rtpp = &rtp;
130 }
131 error = create_thread(td, NULL, param->start_func, param->arg,
132 param->stack_base, param->stack_size, param->tls_base,
133 param->child_tid, param->parent_tid, param->flags,
134 rtpp);
135 return (error);
136 }
137
138 static int
139 create_thread(struct thread *td, mcontext_t *ctx,
140 void (*start_func)(void *), void *arg,
141 char *stack_base, size_t stack_size,
142 char *tls_base,
143 long *child_tid, long *parent_tid,
144 int flags, struct rtprio *rtp)
145 {
146 stack_t stack;
147 struct thread *newtd;
148 struct proc *p;
149 int error;
150
151 error = 0;
152 p = td->td_proc;
153
154 /* Have race condition but it is cheap. */
155 if (p->p_numthreads >= max_threads_per_proc)
156 return (EPROCLIM);
157
158 if (rtp != NULL) {
159 switch(rtp->type) {
160 case RTP_PRIO_REALTIME:
161 case RTP_PRIO_FIFO:
162 /* Only root can set scheduler policy */
163 if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
164 return (EPERM);
165 if (rtp->prio > RTP_PRIO_MAX)
166 return (EINVAL);
167 break;
168 case RTP_PRIO_NORMAL:
169 rtp->prio = 0;
170 break;
171 default:
172 return (EINVAL);
173 }
174 }
175
176 /* Initialize our td */
177 newtd = thread_alloc();
178 if (newtd == NULL)
179 return (ENOMEM);
180
181 /*
182 * Try the copyout as soon as we allocate the td so we don't
183 * have to tear things down in a failure case below.
184 * Here we copy out tid to two places, one for child and one
185 * for parent, because pthread can create a detached thread,
186 * if parent wants to safely access child tid, it has to provide
187 * its storage, because child thread may exit quickly and
188 * memory is freed before parent thread can access it.
189 */
190 if ((child_tid != NULL &&
191 suword_lwpid(child_tid, newtd->td_tid)) ||
192 (parent_tid != NULL &&
193 suword_lwpid(parent_tid, newtd->td_tid))) {
194 thread_free(newtd);
195 return (EFAULT);
196 }
197
198 bzero(&newtd->td_startzero,
199 __rangeof(struct thread, td_startzero, td_endzero));
200 bcopy(&td->td_startcopy, &newtd->td_startcopy,
201 __rangeof(struct thread, td_startcopy, td_endcopy));
202 bzero(&newtd->td_osd, sizeof(struct osd));
203 newtd->td_proc = td->td_proc;
204 newtd->td_ucred = crhold(td->td_ucred);
205
206 cpu_set_upcall(newtd, td);
207
208 if (ctx != NULL) { /* old way to set user context */
209 error = set_mcontext(newtd, ctx);
210 if (error != 0) {
211 thread_free(newtd);
212 crfree(td->td_ucred);
213 return (error);
214 }
215 } else {
216 /* Set up our machine context. */
217 stack.ss_sp = stack_base;
218 stack.ss_size = stack_size;
219 /* Set upcall address to user thread entry function. */
220 cpu_set_upcall_kse(newtd, start_func, arg, &stack);
221 /* Setup user TLS address and TLS pointer register. */
222 error = cpu_set_user_tls(newtd, tls_base);
223 if (error != 0) {
224 thread_free(newtd);
225 crfree(td->td_ucred);
226 return (error);
227 }
228 }
229
230 PROC_LOCK(td->td_proc);
231 td->td_proc->p_flag |= P_HADTHREADS;
232 newtd->td_sigmask = td->td_sigmask;
233 PROC_SLOCK(p);
234 thread_link(newtd, p);
235 thread_lock(td);
236 /* let the scheduler know about these things. */
237 sched_fork_thread(td, newtd);
238 thread_unlock(td);
239 PROC_SUNLOCK(p);
240 PROC_UNLOCK(p);
241 thread_lock(newtd);
242 if (rtp != NULL) {
243 if (!(td->td_pri_class == PRI_TIMESHARE &&
244 rtp->type == RTP_PRIO_NORMAL)) {
245 rtp_to_pri(rtp, newtd);
246 sched_prio(newtd, newtd->td_user_pri);
247 } /* ignore timesharing class */
248 }
249 TD_SET_CAN_RUN(newtd);
250 /* if ((flags & THR_SUSPENDED) == 0) */
251 sched_add(newtd, SRQ_BORING);
252 thread_unlock(newtd);
253
254 return (error);
255 }
256
257 int
258 thr_self(struct thread *td, struct thr_self_args *uap)
259 /* long *id */
260 {
261 int error;
262
263 error = suword_lwpid(uap->id, (unsigned)td->td_tid);
264 if (error == -1)
265 return (EFAULT);
266 return (0);
267 }
268
269 int
270 thr_exit(struct thread *td, struct thr_exit_args *uap)
271 /* long *state */
272 {
273 struct proc *p;
274
275 p = td->td_proc;
276
277 /* Signal userland that it can free the stack. */
278 if ((void *)uap->state != NULL) {
279 suword_lwpid(uap->state, 1);
280 kern_umtx_wake(td, uap->state, INT_MAX, 0);
281 }
282
283 PROC_LOCK(p);
284 sigqueue_flush(&td->td_sigqueue);
285 PROC_SLOCK(p);
286
287 /*
288 * Shutting down last thread in the proc. This will actually
289 * call exit() in the trampoline when it returns.
290 */
291 if (p->p_numthreads != 1) {
292 thread_stopped(p);
293 thread_exit();
294 /* NOTREACHED */
295 }
296 PROC_SUNLOCK(p);
297 PROC_UNLOCK(p);
298 return (0);
299 }
300
301 int
302 thr_kill(struct thread *td, struct thr_kill_args *uap)
303 /* long id, int sig */
304 {
305 struct thread *ttd;
306 struct proc *p;
307 int error;
308
309 p = td->td_proc;
310 error = 0;
311 PROC_LOCK(p);
312 if (uap->id == -1) {
313 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
314 error = EINVAL;
315 } else {
316 error = ESRCH;
317 FOREACH_THREAD_IN_PROC(p, ttd) {
318 if (ttd != td) {
319 error = 0;
320 if (uap->sig == 0)
321 break;
322 tdsignal(p, ttd, uap->sig, NULL);
323 }
324 }
325 }
326 } else {
327 if (uap->id != td->td_tid)
328 ttd = thread_find(p, uap->id);
329 else
330 ttd = td;
331 if (ttd == NULL)
332 error = ESRCH;
333 else if (uap->sig == 0)
334 ;
335 else if (!_SIG_VALID(uap->sig))
336 error = EINVAL;
337 else
338 tdsignal(p, ttd, uap->sig, NULL);
339 }
340 PROC_UNLOCK(p);
341 return (error);
342 }
343
344 int
345 thr_kill2(struct thread *td, struct thr_kill2_args *uap)
346 /* pid_t pid, long id, int sig */
347 {
348 struct thread *ttd;
349 struct proc *p;
350 int error;
351
352 AUDIT_ARG(signum, uap->sig);
353
354 if (uap->pid == td->td_proc->p_pid) {
355 p = td->td_proc;
356 PROC_LOCK(p);
357 } else if ((p = pfind(uap->pid)) == NULL) {
358 return (ESRCH);
359 }
360 AUDIT_ARG(process, p);
361
362 error = p_cansignal(td, p, uap->sig);
363 if (error == 0) {
364 if (uap->id == -1) {
365 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
366 error = EINVAL;
367 } else {
368 error = ESRCH;
369 FOREACH_THREAD_IN_PROC(p, ttd) {
370 if (ttd != td) {
371 error = 0;
372 if (uap->sig == 0)
373 break;
374 tdsignal(p, ttd, uap->sig, NULL);
375 }
376 }
377 }
378 } else {
379 if (uap->id != td->td_tid)
380 ttd = thread_find(p, uap->id);
381 else
382 ttd = td;
383 if (ttd == NULL)
384 error = ESRCH;
385 else if (uap->sig == 0)
386 ;
387 else if (!_SIG_VALID(uap->sig))
388 error = EINVAL;
389 else
390 tdsignal(p, ttd, uap->sig, NULL);
391 }
392 }
393 PROC_UNLOCK(p);
394 return (error);
395 }
396
397 int
398 thr_suspend(struct thread *td, struct thr_suspend_args *uap)
399 /* const struct timespec *timeout */
400 {
401 struct timespec ts, *tsp;
402 int error;
403
404 error = 0;
405 tsp = NULL;
406 if (uap->timeout != NULL) {
407 error = copyin((const void *)uap->timeout, (void *)&ts,
408 sizeof(struct timespec));
409 if (error != 0)
410 return (error);
411 tsp = &ts;
412 }
413
414 return (kern_thr_suspend(td, tsp));
415 }
416
417 int
418 kern_thr_suspend(struct thread *td, struct timespec *tsp)
419 {
420 struct timeval tv;
421 int error = 0, hz = 0;
422
423 if (tsp != NULL) {
424 if (tsp->tv_nsec < 0 || tsp->tv_nsec > 1000000000)
425 return (EINVAL);
426 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
427 return (ETIMEDOUT);
428 TIMESPEC_TO_TIMEVAL(&tv, tsp);
429 hz = tvtohz(&tv);
430 }
431
432 if (td->td_pflags & TDP_WAKEUP) {
433 td->td_pflags &= ~TDP_WAKEUP;
434 return (0);
435 }
436
437 PROC_LOCK(td->td_proc);
438 if ((td->td_flags & TDF_THRWAKEUP) == 0)
439 error = msleep((void *)td, &td->td_proc->p_mtx, PCATCH, "lthr",
440 hz);
441 if (td->td_flags & TDF_THRWAKEUP) {
442 thread_lock(td);
443 td->td_flags &= ~TDF_THRWAKEUP;
444 thread_unlock(td);
445 PROC_UNLOCK(td->td_proc);
446 return (0);
447 }
448 PROC_UNLOCK(td->td_proc);
449 if (error == EWOULDBLOCK)
450 error = ETIMEDOUT;
451 else if (error == ERESTART) {
452 if (hz != 0)
453 error = EINTR;
454 }
455 return (error);
456 }
457
458 int
459 thr_wake(struct thread *td, struct thr_wake_args *uap)
460 /* long id */
461 {
462 struct proc *p;
463 struct thread *ttd;
464
465 if (uap->id == td->td_tid) {
466 td->td_pflags |= TDP_WAKEUP;
467 return (0);
468 }
469
470 p = td->td_proc;
471 PROC_LOCK(p);
472 ttd = thread_find(p, uap->id);
473 if (ttd == NULL) {
474 PROC_UNLOCK(p);
475 return (ESRCH);
476 }
477 thread_lock(ttd);
478 ttd->td_flags |= TDF_THRWAKEUP;
479 thread_unlock(ttd);
480 wakeup((void *)ttd);
481 PROC_UNLOCK(p);
482 return (0);
483 }
484
485 int
486 thr_set_name(struct thread *td, struct thr_set_name_args *uap)
487 {
488 struct proc *p = td->td_proc;
489 char name[MAXCOMLEN + 1];
490 struct thread *ttd;
491 int error;
492
493 error = 0;
494 name[0] = '\0';
495 if (uap->name != NULL) {
496 error = copyinstr(uap->name, name, sizeof(name),
497 NULL);
498 if (error)
499 return (error);
500 }
501 PROC_LOCK(p);
502 if (uap->id == td->td_tid)
503 ttd = td;
504 else
505 ttd = thread_find(p, uap->id);
506 if (ttd != NULL)
507 strcpy(ttd->td_name, name);
508 else
509 error = ESRCH;
510 PROC_UNLOCK(p);
511 return (error);
512 }
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