2 * Copyright (c) 2003, Jeffrey Roberson <jeff@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
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.
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.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include "opt_compat.h"
31 #include "opt_posix.h"
32 #include <sys/param.h>
33 #include <sys/kernel.h>
35 #include <sys/mutex.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>
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>
53 #include <sys/rtprio.h>
55 #include <sys/limits.h>
57 #include <vm/vm_domain.h>
59 #include <machine/frame.h>
61 #include <security/audit/audit.h>
63 static SYSCTL_NODE(_kern, OID_AUTO, threads, CTLFLAG_RW, 0,
66 static int max_threads_per_proc = 1500;
67 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_per_proc, CTLFLAG_RW,
68 &max_threads_per_proc, 0, "Limit on threads per proc");
70 static int max_threads_hits;
71 SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_hits, CTLFLAG_RD,
72 &max_threads_hits, 0, "kern.threads.max_threads_per_proc hit count");
74 #ifdef COMPAT_FREEBSD32
77 suword_lwpid(void *addr, lwpid_t lwpid)
81 if (SV_CURPROC_FLAG(SV_LP64))
82 error = suword(addr, lwpid);
84 error = suword32(addr, lwpid);
89 #define suword_lwpid suword
93 * System call interface.
96 struct thr_create_initthr_args {
102 thr_create_initthr(struct thread *td, void *thunk)
104 struct thr_create_initthr_args *args;
106 /* Copy out the child tid. */
108 if (args->tid != NULL && suword_lwpid(args->tid, td->td_tid))
111 return (set_mcontext(td, &args->ctx.uc_mcontext));
115 sys_thr_create(struct thread *td, struct thr_create_args *uap)
116 /* ucontext_t *ctx, long *id, int flags */
118 struct thr_create_initthr_args args;
121 if ((error = copyin(uap->ctx, &args.ctx, sizeof(args.ctx))))
124 return (thread_create(td, NULL, thr_create_initthr, &args));
128 sys_thr_new(struct thread *td, struct thr_new_args *uap)
129 /* struct thr_param * */
131 struct thr_param param;
134 if (uap->param_size < 0 || uap->param_size > sizeof(param))
136 bzero(¶m, sizeof(param));
137 if ((error = copyin(uap->param, ¶m, uap->param_size)))
139 return (kern_thr_new(td, ¶m));
143 thr_new_initthr(struct thread *td, void *thunk)
146 struct thr_param *param;
149 * Here we copy out tid to two places, one for child and one
150 * for parent, because pthread can create a detached thread,
151 * if parent wants to safely access child tid, it has to provide
152 * its storage, because child thread may exit quickly and
153 * memory is freed before parent thread can access it.
156 if ((param->child_tid != NULL &&
157 suword_lwpid(param->child_tid, td->td_tid)) ||
158 (param->parent_tid != NULL &&
159 suword_lwpid(param->parent_tid, td->td_tid)))
162 /* Set up our machine context. */
163 stack.ss_sp = param->stack_base;
164 stack.ss_size = param->stack_size;
165 /* Set upcall address to user thread entry function. */
166 cpu_set_upcall_kse(td, param->start_func, param->arg, &stack);
167 /* Setup user TLS address and TLS pointer register. */
168 return (cpu_set_user_tls(td, param->tls_base));
172 kern_thr_new(struct thread *td, struct thr_param *param)
174 struct rtprio rtp, *rtpp;
178 if (param->rtp != 0) {
179 error = copyin(param->rtp, &rtp, sizeof(struct rtprio));
184 return (thread_create(td, rtpp, thr_new_initthr, param));
188 thread_create(struct thread *td, struct rtprio *rtp,
189 int (*initialize_thread)(struct thread *, void *), void *thunk)
191 struct thread *newtd;
199 case RTP_PRIO_REALTIME:
201 /* Only root can set scheduler policy */
202 if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
204 if (rtp->prio > RTP_PRIO_MAX)
207 case RTP_PRIO_NORMAL:
218 error = racct_add(p, RACCT_NTHR, 1);
225 /* Initialize our td */
226 error = kern_thr_alloc(p, 0, &newtd);
230 cpu_set_upcall(newtd, td);
232 bzero(&newtd->td_startzero,
233 __rangeof(struct thread, td_startzero, td_endzero));
234 bcopy(&td->td_startcopy, &newtd->td_startcopy,
235 __rangeof(struct thread, td_startcopy, td_endcopy));
236 newtd->td_proc = td->td_proc;
237 thread_cow_get(newtd, td);
239 error = initialize_thread(newtd, thunk);
241 thread_cow_free(newtd);
247 p->p_flag |= P_HADTHREADS;
248 thread_link(newtd, p);
249 bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
251 /* let the scheduler know about these things. */
252 sched_fork_thread(td, newtd);
255 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
256 if (p->p_flag2 & P2_LWP_EVENTS)
257 newtd->td_dbgflags |= TDB_BORN;
260 * Copy the existing thread VM policy into the new thread.
262 vm_domain_policy_localcopy(&newtd->td_vm_dom_policy,
263 &td->td_vm_dom_policy);
271 if (!(td->td_pri_class == PRI_TIMESHARE &&
272 rtp->type == RTP_PRIO_NORMAL)) {
273 rtp_to_pri(rtp, newtd);
274 sched_prio(newtd, newtd->td_user_pri);
275 } /* ignore timesharing class */
277 TD_SET_CAN_RUN(newtd);
278 sched_add(newtd, SRQ_BORING);
279 thread_unlock(newtd);
287 racct_sub(p, RACCT_NTHR, 1);
295 sys_thr_self(struct thread *td, struct thr_self_args *uap)
300 error = suword_lwpid(uap->id, (unsigned)td->td_tid);
307 sys_thr_exit(struct thread *td, struct thr_exit_args *uap)
311 /* Signal userland that it can free the stack. */
312 if ((void *)uap->state != NULL) {
313 suword_lwpid(uap->state, 1);
314 kern_umtx_wake(td, uap->state, INT_MAX, 0);
317 return (kern_thr_exit(td));
321 kern_thr_exit(struct thread *td)
328 * If all of the threads in a process call this routine to
329 * exit (e.g. all threads call pthread_exit()), exactly one
330 * thread should return to the caller to terminate the process
331 * instead of the thread.
333 * Checking p_numthreads alone is not sufficient since threads
334 * might be committed to terminating while the PROC_LOCK is
335 * dropped in either ptracestop() or while removing this thread
336 * from the tidhash. Instead, the p_pendingexits field holds
337 * the count of threads in either of those states and a thread
338 * is considered the "last" thread if all of the other threads
339 * in a process are already terminating.
342 if (p->p_numthreads == p->p_pendingexits + 1) {
344 * Ignore attempts to shut down last thread in the
345 * proc. This will actually call _exit(2) in the
346 * usermode trampoline when it returns.
353 td->td_dbgflags |= TDB_EXIT;
354 if (p->p_flag & P_TRACED && p->p_flag2 & P2_LWP_EVENTS)
355 ptracestop(td, SIGTRAP);
362 * The check above should prevent all other threads from this
363 * process from exiting while the PROC_LOCK is dropped, so
364 * there must be at least one other thread other than the
367 KASSERT(p->p_numthreads > 1, ("too few threads"));
368 racct_sub(p, RACCT_NTHR, 1);
370 umtx_thread_exit(td);
378 sys_thr_kill(struct thread *td, struct thr_kill_args *uap)
379 /* long id, int sig */
388 ksi.ksi_signo = uap->sig;
389 ksi.ksi_code = SI_LWP;
390 ksi.ksi_pid = p->p_pid;
391 ksi.ksi_uid = td->td_ucred->cr_ruid;
393 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
398 FOREACH_THREAD_IN_PROC(p, ttd) {
403 tdksignal(ttd, uap->sig, &ksi);
410 ttd = tdfind((lwpid_t)uap->id, p->p_pid);
415 else if (!_SIG_VALID(uap->sig))
418 tdksignal(ttd, uap->sig, &ksi);
419 PROC_UNLOCK(ttd->td_proc);
425 sys_thr_kill2(struct thread *td, struct thr_kill2_args *uap)
426 /* pid_t pid, long id, int sig */
433 AUDIT_ARG_SIGNUM(uap->sig);
436 ksi.ksi_signo = uap->sig;
437 ksi.ksi_code = SI_LWP;
438 ksi.ksi_pid = td->td_proc->p_pid;
439 ksi.ksi_uid = td->td_ucred->cr_ruid;
441 if ((p = pfind(uap->pid)) == NULL)
443 AUDIT_ARG_PROCESS(p);
444 error = p_cansignal(td, p, uap->sig);
449 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
453 FOREACH_THREAD_IN_PROC(p, ttd) {
458 tdksignal(ttd, uap->sig, &ksi);
464 ttd = tdfind((lwpid_t)uap->id, uap->pid);
468 AUDIT_ARG_PROCESS(p);
469 error = p_cansignal(td, p, uap->sig);
472 else if (!_SIG_VALID(uap->sig))
475 tdksignal(ttd, uap->sig, &ksi);
482 sys_thr_suspend(struct thread *td, struct thr_suspend_args *uap)
483 /* const struct timespec *timeout */
485 struct timespec ts, *tsp;
489 if (uap->timeout != NULL) {
490 error = umtx_copyin_timeout(uap->timeout, &ts);
496 return (kern_thr_suspend(td, tsp));
500 kern_thr_suspend(struct thread *td, struct timespec *tsp)
502 struct proc *p = td->td_proc;
507 if (td->td_pflags & TDP_WAKEUP) {
508 td->td_pflags &= ~TDP_WAKEUP;
513 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
516 TIMESPEC_TO_TIMEVAL(&tv, tsp);
522 if (error == 0 && (td->td_flags & TDF_THRWAKEUP) == 0)
523 error = msleep((void *)td, &p->p_mtx,
524 PCATCH, "lthr", timo);
526 if (td->td_flags & TDF_THRWAKEUP) {
528 td->td_flags &= ~TDF_THRWAKEUP;
534 if (error == EWOULDBLOCK)
536 else if (error == ERESTART) {
544 sys_thr_wake(struct thread *td, struct thr_wake_args *uap)
550 if (uap->id == td->td_tid) {
551 td->td_pflags |= TDP_WAKEUP;
556 ttd = tdfind((lwpid_t)uap->id, p->p_pid);
560 ttd->td_flags |= TDF_THRWAKEUP;
568 sys_thr_set_name(struct thread *td, struct thr_set_name_args *uap)
571 char name[MAXCOMLEN + 1];
577 if (uap->name != NULL) {
578 error = copyinstr(uap->name, name, sizeof(name),
584 ttd = tdfind((lwpid_t)uap->id, p->p_pid);
587 strcpy(ttd->td_name, name);
589 sched_clear_tdname(ttd);
596 kern_thr_alloc(struct proc *p, int pages, struct thread **ntd)
599 /* Have race condition but it is cheap. */
600 if (p->p_numthreads >= max_threads_per_proc) {
605 *ntd = thread_alloc(pages);