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("$FreeBSD$");
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 newtd->td_proc = td->td_proc;
203 newtd->td_ucred = crhold(td->td_ucred);
204
205 cpu_set_upcall(newtd, td);
206
207 if (ctx != NULL) { /* old way to set user context */
208 error = set_mcontext(newtd, ctx);
209 if (error != 0) {
210 thread_free(newtd);
211 crfree(td->td_ucred);
212 return (error);
213 }
214 } else {
215 /* Set up our machine context. */
216 stack.ss_sp = stack_base;
217 stack.ss_size = stack_size;
218 /* Set upcall address to user thread entry function. */
219 cpu_set_upcall_kse(newtd, start_func, arg, &stack);
220 /* Setup user TLS address and TLS pointer register. */
221 error = cpu_set_user_tls(newtd, tls_base);
222 if (error != 0) {
223 thread_free(newtd);
224 crfree(td->td_ucred);
225 return (error);
226 }
227 }
228
229 PROC_LOCK(td->td_proc);
230 td->td_proc->p_flag |= P_HADTHREADS;
231 newtd->td_sigmask = td->td_sigmask;
232 PROC_SLOCK(p);
233 thread_link(newtd, p);
234 thread_lock(td);
235 /* let the scheduler know about these things. */
236 sched_fork_thread(td, newtd);
237 thread_unlock(td);
238 PROC_SUNLOCK(p);
239 PROC_UNLOCK(p);
240 thread_lock(newtd);
241 if (rtp != NULL) {
242 if (!(td->td_pri_class == PRI_TIMESHARE &&
243 rtp->type == RTP_PRIO_NORMAL)) {
244 rtp_to_pri(rtp, newtd);
245 sched_prio(newtd, newtd->td_user_pri);
246 } /* ignore timesharing class */
247 }
248 TD_SET_CAN_RUN(newtd);
249 /* if ((flags & THR_SUSPENDED) == 0) */
250 sched_add(newtd, SRQ_BORING);
251 thread_unlock(newtd);
252
253 return (error);
254 }
255
256 int
257 thr_self(struct thread *td, struct thr_self_args *uap)
258 /* long *id */
259 {
260 int error;
261
262 error = suword_lwpid(uap->id, (unsigned)td->td_tid);
263 if (error == -1)
264 return (EFAULT);
265 return (0);
266 }
267
268 int
269 thr_exit(struct thread *td, struct thr_exit_args *uap)
270 /* long *state */
271 {
272 struct proc *p;
273
274 p = td->td_proc;
275
276 /* Signal userland that it can free the stack. */
277 if ((void *)uap->state != NULL) {
278 suword_lwpid(uap->state, 1);
279 kern_umtx_wake(td, uap->state, INT_MAX, 0);
280 }
281
282 PROC_LOCK(p);
283 sigqueue_flush(&td->td_sigqueue);
284 PROC_SLOCK(p);
285
286 /*
287 * Shutting down last thread in the proc. This will actually
288 * call exit() in the trampoline when it returns.
289 */
290 if (p->p_numthreads != 1) {
291 thread_stopped(p);
292 thread_exit();
293 /* NOTREACHED */
294 }
295 PROC_SUNLOCK(p);
296 PROC_UNLOCK(p);
297 return (0);
298 }
299
300 int
301 thr_kill(struct thread *td, struct thr_kill_args *uap)
302 /* long id, int sig */
303 {
304 struct thread *ttd;
305 struct proc *p;
306 int error;
307
308 p = td->td_proc;
309 error = 0;
310 PROC_LOCK(p);
311 if (uap->id == -1) {
312 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
313 error = EINVAL;
314 } else {
315 error = ESRCH;
316 FOREACH_THREAD_IN_PROC(p, ttd) {
317 if (ttd != td) {
318 error = 0;
319 if (uap->sig == 0)
320 break;
321 tdsignal(p, ttd, uap->sig, NULL);
322 }
323 }
324 }
325 } else {
326 if (uap->id != td->td_tid)
327 ttd = thread_find(p, uap->id);
328 else
329 ttd = td;
330 if (ttd == NULL)
331 error = ESRCH;
332 else if (uap->sig == 0)
333 ;
334 else if (!_SIG_VALID(uap->sig))
335 error = EINVAL;
336 else
337 tdsignal(p, ttd, uap->sig, NULL);
338 }
339 PROC_UNLOCK(p);
340 return (error);
341 }
342
343 int
344 thr_kill2(struct thread *td, struct thr_kill2_args *uap)
345 /* pid_t pid, long id, int sig */
346 {
347 struct thread *ttd;
348 struct proc *p;
349 int error;
350
351 AUDIT_ARG(signum, uap->sig);
352
353 if (uap->pid == td->td_proc->p_pid) {
354 p = td->td_proc;
355 PROC_LOCK(p);
356 } else if ((p = pfind(uap->pid)) == NULL) {
357 return (ESRCH);
358 }
359 AUDIT_ARG(process, p);
360
361 error = p_cansignal(td, p, uap->sig);
362 if (error == 0) {
363 if (uap->id == -1) {
364 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
365 error = EINVAL;
366 } else {
367 error = ESRCH;
368 FOREACH_THREAD_IN_PROC(p, ttd) {
369 if (ttd != td) {
370 error = 0;
371 if (uap->sig == 0)
372 break;
373 tdsignal(p, ttd, uap->sig, NULL);
374 }
375 }
376 }
377 } else {
378 if (uap->id != td->td_tid)
379 ttd = thread_find(p, uap->id);
380 else
381 ttd = td;
382 if (ttd == NULL)
383 error = ESRCH;
384 else if (uap->sig == 0)
385 ;
386 else if (!_SIG_VALID(uap->sig))
387 error = EINVAL;
388 else
389 tdsignal(p, ttd, uap->sig, NULL);
390 }
391 }
392 PROC_UNLOCK(p);
393 return (error);
394 }
395
396 int
397 thr_suspend(struct thread *td, struct thr_suspend_args *uap)
398 /* const struct timespec *timeout */
399 {
400 struct timespec ts, *tsp;
401 int error;
402
403 error = 0;
404 tsp = NULL;
405 if (uap->timeout != NULL) {
406 error = copyin((const void *)uap->timeout, (void *)&ts,
407 sizeof(struct timespec));
408 if (error != 0)
409 return (error);
410 tsp = &ts;
411 }
412
413 return (kern_thr_suspend(td, tsp));
414 }
415
416 int
417 kern_thr_suspend(struct thread *td, struct timespec *tsp)
418 {
419 struct timeval tv;
420 int error = 0, hz = 0;
421
422 if (tsp != NULL) {
423 if (tsp->tv_nsec < 0 || tsp->tv_nsec > 1000000000)
424 return (EINVAL);
425 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
426 return (ETIMEDOUT);
427 TIMESPEC_TO_TIMEVAL(&tv, tsp);
428 hz = tvtohz(&tv);
429 }
430
431 if (td->td_pflags & TDP_WAKEUP) {
432 td->td_pflags &= ~TDP_WAKEUP;
433 return (0);
434 }
435
436 PROC_LOCK(td->td_proc);
437 if ((td->td_flags & TDF_THRWAKEUP) == 0)
438 error = msleep((void *)td, &td->td_proc->p_mtx, PCATCH, "lthr",
439 hz);
440 if (td->td_flags & TDF_THRWAKEUP) {
441 thread_lock(td);
442 td->td_flags &= ~TDF_THRWAKEUP;
443 thread_unlock(td);
444 PROC_UNLOCK(td->td_proc);
445 return (0);
446 }
447 PROC_UNLOCK(td->td_proc);
448 if (error == EWOULDBLOCK)
449 error = ETIMEDOUT;
450 else if (error == ERESTART) {
451 if (hz != 0)
452 error = EINTR;
453 }
454 return (error);
455 }
456
457 int
458 thr_wake(struct thread *td, struct thr_wake_args *uap)
459 /* long id */
460 {
461 struct proc *p;
462 struct thread *ttd;
463
464 if (uap->id == td->td_tid) {
465 td->td_pflags |= TDP_WAKEUP;
466 return (0);
467 }
468
469 p = td->td_proc;
470 PROC_LOCK(p);
471 ttd = thread_find(p, uap->id);
472 if (ttd == NULL) {
473 PROC_UNLOCK(p);
474 return (ESRCH);
475 }
476 thread_lock(ttd);
477 ttd->td_flags |= TDF_THRWAKEUP;
478 thread_unlock(ttd);
479 wakeup((void *)ttd);
480 PROC_UNLOCK(p);
481 return (0);
482 }
483
484 int
485 thr_set_name(struct thread *td, struct thr_set_name_args *uap)
486 {
487 struct proc *p = td->td_proc;
488 char name[MAXCOMLEN + 1];
489 struct thread *ttd;
490 int error;
491
492 error = 0;
493 name[0] = '\0';
494 if (uap->name != NULL) {
495 error = copyinstr(uap->name, name, sizeof(name),
496 NULL);
497 if (error)
498 return (error);
499 }
500 PROC_LOCK(p);
501 if (uap->id == td->td_tid)
502 ttd = td;
503 else
504 ttd = thread_find(p, uap->id);
505 if (ttd != NULL)
506 strcpy(ttd->td_name, name);
507 else
508 error = ESRCH;
509 PROC_UNLOCK(p);
510 return (error);
511 }
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