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/sysent.h>
44 #include <sys/systm.h>
45 #include <sys/sysproto.h>
46 #include <sys/signalvar.h>
47 #include <sys/ucontext.h>
49 #include <sys/rtprio.h>
51 #include <sys/limits.h>
53 #include <machine/frame.h>
57 extern struct sysentvec ia32_freebsd_sysvec;
60 suword_lwpid(void *addr, lwpid_t lwpid)
64 if (curproc->p_sysent != &ia32_freebsd_sysvec)
65 error = suword(addr, lwpid);
67 error = suword32(addr, lwpid);
72 #define suword_lwpid suword
75 extern int max_threads_per_proc;
77 static int create_thread(struct thread *td, mcontext_t *ctx,
78 void (*start_func)(void *), void *arg,
79 char *stack_base, size_t stack_size,
81 long *child_tid, long *parent_tid,
82 int flags, struct rtprio *rtp);
85 * System call interface.
88 thr_create(struct thread *td, struct thr_create_args *uap)
89 /* ucontext_t *ctx, long *id, int flags */
94 if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
97 error = create_thread(td, &ctx.uc_mcontext, NULL, NULL,
98 NULL, 0, NULL, uap->id, NULL, uap->flags, NULL);
103 thr_new(struct thread *td, struct thr_new_args *uap)
104 /* struct thr_param * */
106 struct thr_param param;
109 if (uap->param_size < 0 || uap->param_size > sizeof(param))
111 bzero(¶m, sizeof(param));
112 if ((error = copyin(uap->param, ¶m, uap->param_size)))
114 return (kern_thr_new(td, ¶m));
118 kern_thr_new(struct thread *td, struct thr_param *param)
120 struct rtprio rtp, *rtpp;
124 if (param->rtp != 0) {
125 error = copyin(param->rtp, &rtp, sizeof(struct rtprio));
128 error = create_thread(td, NULL, param->start_func, param->arg,
129 param->stack_base, param->stack_size, param->tls_base,
130 param->child_tid, param->parent_tid, param->flags,
136 create_thread(struct thread *td, mcontext_t *ctx,
137 void (*start_func)(void *), void *arg,
138 char *stack_base, size_t stack_size,
140 long *child_tid, long *parent_tid,
141 int flags, struct rtprio *rtp)
144 struct thread *newtd;
152 /* Have race condition but it is cheap. */
153 if (p->p_numthreads >= max_threads_per_proc)
158 case RTP_PRIO_REALTIME:
160 /* Only root can set scheduler policy */
161 if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
163 if (rtp->prio > RTP_PRIO_MAX)
166 case RTP_PRIO_NORMAL:
174 /* Initialize our td */
175 newtd = thread_alloc();
178 * Try the copyout as soon as we allocate the td so we don't
179 * have to tear things down in a failure case below.
180 * Here we copy out tid to two places, one for child and one
181 * for parent, because pthread can create a detached thread,
182 * if parent wants to safely access child tid, it has to provide
183 * its storage, because child thread may exit quickly and
184 * memory is freed before parent thread can access it.
187 if ((child_tid != NULL &&
188 suword_lwpid(child_tid, newtd->td_tid)) ||
189 (parent_tid != NULL &&
190 suword_lwpid(parent_tid, newtd->td_tid))) {
195 bzero(&newtd->td_startzero,
196 __rangeof(struct thread, td_startzero, td_endzero));
197 bcopy(&td->td_startcopy, &newtd->td_startcopy,
198 __rangeof(struct thread, td_startcopy, td_endcopy));
199 newtd->td_proc = td->td_proc;
200 newtd->td_ucred = crhold(td->td_ucred);
202 cpu_set_upcall(newtd, td);
204 if (ctx != NULL) { /* old way to set user context */
205 error = set_mcontext(newtd, ctx);
208 crfree(td->td_ucred);
212 /* Set up our machine context. */
213 stack.ss_sp = stack_base;
214 stack.ss_size = stack_size;
215 /* Set upcall address to user thread entry function. */
216 cpu_set_upcall_kse(newtd, start_func, arg, &stack);
217 /* Setup user TLS address and TLS pointer register. */
218 error = cpu_set_user_tls(newtd, tls_base);
221 crfree(td->td_ucred);
226 PROC_LOCK(td->td_proc);
227 td->td_proc->p_flag |= P_HADTHREADS;
228 newtd->td_sigmask = td->td_sigmask;
229 mtx_lock_spin(&sched_lock);
230 thread_link(newtd, p);
233 /* let the scheduler know about these things. */
234 sched_fork_thread(td, newtd);
236 if (!(td->td_pri_class == PRI_TIMESHARE &&
237 rtp->type == RTP_PRIO_NORMAL)) {
238 rtp_to_pri(rtp, newtd);
239 sched_prio(newtd, newtd->td_user_pri);
240 } /* ignore timesharing class */
242 TD_SET_CAN_RUN(newtd);
243 /* if ((flags & THR_SUSPENDED) == 0) */
244 setrunqueue(newtd, SRQ_BORING);
245 mtx_unlock_spin(&sched_lock);
251 thr_self(struct thread *td, struct thr_self_args *uap)
256 error = suword_lwpid(uap->id, (unsigned)td->td_tid);
263 thr_exit(struct thread *td, struct thr_exit_args *uap)
270 /* Signal userland that it can free the stack. */
271 if ((void *)uap->state != NULL) {
272 suword_lwpid(uap->state, 1);
273 kern_umtx_wake(td, uap->state, INT_MAX);
277 sigqueue_flush(&td->td_sigqueue);
278 mtx_lock_spin(&sched_lock);
281 * Shutting down last thread in the proc. This will actually
282 * call exit() in the trampoline when it returns.
284 if (p->p_numthreads != 1) {
289 mtx_unlock_spin(&sched_lock);
295 thr_kill(struct thread *td, struct thr_kill_args *uap)
296 /* long id, int sig */
306 if (uap->sig != 0 && !_SIG_VALID(uap->sig)) {
310 FOREACH_THREAD_IN_PROC(p, ttd) {
315 tdsignal(p, ttd, uap->sig, NULL);
320 if (uap->id != td->td_tid)
321 ttd = thread_find(p, uap->id);
326 else if (uap->sig == 0)
328 else if (!_SIG_VALID(uap->sig))
331 tdsignal(p, ttd, uap->sig, NULL);
338 thr_suspend(struct thread *td, struct thr_suspend_args *uap)
339 /* const struct timespec *timeout */
341 struct timespec ts, *tsp;
346 if (uap->timeout != NULL) {
347 error = copyin((const void *)uap->timeout, (void *)&ts,
348 sizeof(struct timespec));
354 return (kern_thr_suspend(td, tsp));
358 kern_thr_suspend(struct thread *td, struct timespec *tsp)
361 int error = 0, hz = 0;
364 if (tsp->tv_nsec < 0 || tsp->tv_nsec > 1000000000)
366 if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
368 TIMESPEC_TO_TIMEVAL(&tv, tsp);
372 if (td->td_pflags & TDP_WAKEUP) {
373 td->td_pflags &= ~TDP_WAKEUP;
377 PROC_LOCK(td->td_proc);
378 if ((td->td_flags & TDF_THRWAKEUP) == 0)
379 error = msleep((void *)td, &td->td_proc->p_mtx, PCATCH, "lthr",
381 if (td->td_flags & TDF_THRWAKEUP) {
382 mtx_lock_spin(&sched_lock);
383 td->td_flags &= ~TDF_THRWAKEUP;
384 mtx_unlock_spin(&sched_lock);
385 PROC_UNLOCK(td->td_proc);
388 PROC_UNLOCK(td->td_proc);
389 if (error == EWOULDBLOCK)
391 else if (error == ERESTART) {
399 thr_wake(struct thread *td, struct thr_wake_args *uap)
405 if (uap->id == td->td_tid) {
406 td->td_pflags |= TDP_WAKEUP;
412 ttd = thread_find(p, uap->id);
417 mtx_lock_spin(&sched_lock);
418 ttd->td_flags |= TDF_THRWAKEUP;
419 mtx_unlock_spin(&sched_lock);
426 thr_set_name(struct thread *td, struct thr_set_name_args *uap)
428 struct proc *p = td->td_proc;
429 char name[MAXCOMLEN + 1];
435 if (uap->name != NULL) {
436 error = copyinstr(uap->name, name, sizeof(name),
442 if (uap->id == td->td_tid)
445 ttd = thread_find(p, uap->id);
447 strcpy(ttd->td_name, name);