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/resourcevar.h>
40 #include <sys/sched.h>
41 #include <sys/sysctl.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>
50 #include <sys/rtprio.h>
52 #include <sys/limits.h>
54 #include <machine/frame.h>
56 #include <security/audit/audit.h>
60 extern struct sysentvec ia32_freebsd_sysvec;
63 suword_lwpid(void *addr, lwpid_t lwpid)
67 if (curproc->p_sysent != &ia32_freebsd_sysvec)
68 error = suword(addr, lwpid);
70 error = suword32(addr, lwpid);
75 #define suword_lwpid suword
78 extern int max_threads_per_proc;
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,
84 long *child_tid, long *parent_tid,
85 int flags, struct rtprio *rtp);
88 * System call interface.
91 thr_create(struct thread *td, struct thr_create_args *uap)
92 /* ucontext_t *ctx, long *id, int flags */
97 if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
100 error = create_thread(td, &ctx.uc_mcontext, NULL, NULL,
101 NULL, 0, NULL, uap->id, NULL, uap->flags, NULL);
106 thr_new(struct thread *td, struct thr_new_args *uap)
107 /* struct thr_param * */
109 struct thr_param param;
112 if (uap->param_size < 0 || uap->param_size > sizeof(param))
114 bzero(¶m, sizeof(param));
115 if ((error = copyin(uap->param, ¶m, uap->param_size)))
117 return (kern_thr_new(td, ¶m));
121 kern_thr_new(struct thread *td, struct thr_param *param)
123 struct rtprio rtp, *rtpp;
127 if (param->rtp != 0) {
128 error = copyin(param->rtp, &rtp, sizeof(struct rtprio));
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,
139 create_thread(struct thread *td, mcontext_t *ctx,
140 void (*start_func)(void *), void *arg,
141 char *stack_base, size_t stack_size,
143 long *child_tid, long *parent_tid,
144 int flags, struct rtprio *rtp)
147 struct thread *newtd;
154 /* Have race condition but it is cheap. */
155 if (p->p_numthreads >= max_threads_per_proc)
160 case RTP_PRIO_REALTIME:
162 /* Only root can set scheduler policy */
163 if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
165 if (rtp->prio > RTP_PRIO_MAX)
168 case RTP_PRIO_NORMAL:
176 /* Initialize our td */
177 newtd = thread_alloc();
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.
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))) {
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);
205 cpu_set_upcall(newtd, td);
207 if (ctx != NULL) { /* old way to set user context */
208 error = set_mcontext(newtd, ctx);
211 crfree(td->td_ucred);
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);
224 crfree(td->td_ucred);
229 PROC_LOCK(td->td_proc);
230 td->td_proc->p_flag |= P_HADTHREADS;
231 newtd->td_sigmask = td->td_sigmask;
233 thread_link(newtd, p);
235 /* let the scheduler know about these things. */
236 sched_fork_thread(td, newtd);
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 */
248 TD_SET_CAN_RUN(newtd);
249 /* if ((flags & THR_SUSPENDED) == 0) */
250 sched_add(newtd, SRQ_BORING);
251 thread_unlock(newtd);
257 thr_self(struct thread *td, struct thr_self_args *uap)
262 error = suword_lwpid(uap->id, (unsigned)td->td_tid);
269 thr_exit(struct thread *td, struct thr_exit_args *uap)
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);
283 sigqueue_flush(&td->td_sigqueue);
287 * Shutting down last thread in the proc. This will actually
288 * call exit() in the trampoline when it returns.
290 if (p->p_numthreads != 1) {
301 thr_kill(struct thread *td, struct thr_kill_args *uap)
302 /* long id, int sig */
312 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
316 FOREACH_THREAD_IN_PROC(p, ttd) {
321 tdsignal(p, ttd, uap->sig, NULL);
326 if (uap->id != td->td_tid)
327 ttd = thread_find(p, uap->id);
332 else if (uap->sig == 0)
334 else if (!_SIG_VALID(uap->sig))
337 tdsignal(p, ttd, uap->sig, NULL);
344 thr_kill2(struct thread *td, struct thr_kill2_args *uap)
345 /* pid_t pid, long id, int sig */
351 AUDIT_ARG(signum, uap->sig);
353 if (uap->pid == td->td_proc->p_pid) {
356 } else if ((p = pfind(uap->pid)) == NULL) {
359 AUDIT_ARG(process, p);
361 error = p_cansignal(td, p, uap->sig);
364 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
368 FOREACH_THREAD_IN_PROC(p, ttd) {
373 tdsignal(p, ttd, uap->sig, NULL);
378 if (uap->id != td->td_tid)
379 ttd = thread_find(p, uap->id);
384 else if (uap->sig == 0)
386 else if (!_SIG_VALID(uap->sig))
389 tdsignal(p, ttd, uap->sig, NULL);
397 thr_suspend(struct thread *td, struct thr_suspend_args *uap)
398 /* const struct timespec *timeout */
400 struct timespec ts, *tsp;
405 if (uap->timeout != NULL) {
406 error = copyin((const void *)uap->timeout, (void *)&ts,
407 sizeof(struct timespec));
413 return (kern_thr_suspend(td, tsp));
417 kern_thr_suspend(struct thread *td, struct timespec *tsp)
420 int error = 0, hz = 0;
423 if (tsp->tv_nsec < 0 || tsp->tv_nsec > 1000000000)
425 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
427 TIMESPEC_TO_TIMEVAL(&tv, tsp);
431 if (td->td_pflags & TDP_WAKEUP) {
432 td->td_pflags &= ~TDP_WAKEUP;
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",
440 if (td->td_flags & TDF_THRWAKEUP) {
442 td->td_flags &= ~TDF_THRWAKEUP;
444 PROC_UNLOCK(td->td_proc);
447 PROC_UNLOCK(td->td_proc);
448 if (error == EWOULDBLOCK)
450 else if (error == ERESTART) {
458 thr_wake(struct thread *td, struct thr_wake_args *uap)
464 if (uap->id == td->td_tid) {
465 td->td_pflags |= TDP_WAKEUP;
471 ttd = thread_find(p, uap->id);
477 ttd->td_flags |= TDF_THRWAKEUP;
485 thr_set_name(struct thread *td, struct thr_set_name_args *uap)
487 struct proc *p = td->td_proc;
488 char name[MAXCOMLEN + 1];
494 if (uap->name != NULL) {
495 error = copyinstr(uap->name, name, sizeof(name),
501 if (uap->id == td->td_tid)
504 ttd = thread_find(p, uap->id);
506 strcpy(ttd->td_name, name);