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 <sys/param.h>
31 #include <sys/kernel.h>
33 #include <sys/mutex.h>
35 #include <sys/resourcevar.h>
36 #include <sys/sched.h>
37 #include <sys/sysctl.h>
39 #include <sys/sysent.h>
40 #include <sys/systm.h>
41 #include <sys/sysproto.h>
42 #include <sys/signalvar.h>
43 #include <sys/ucontext.h>
46 #include <machine/frame.h>
48 extern int max_threads_per_proc;
49 extern int max_groups_per_proc;
51 SYSCTL_DECL(_kern_threads);
52 static int thr_scope_sys = 0;
53 SYSCTL_INT(_kern_threads, OID_AUTO, thr_scope_sys, CTLFLAG_RW,
54 &thr_scope_sys, 0, "sys or proc scope scheduling");
56 static int thr_concurrency = 0;
57 SYSCTL_INT(_kern_threads, OID_AUTO, thr_concurrency, CTLFLAG_RW,
58 &thr_concurrency, 0, "a concurrency value if not default");
61 * Back end support functions.
64 #define RANGEOF(type, start, end) (offsetof(type, end) - offsetof(type, start))
67 * System call interface.
70 thr_create(struct thread *td, struct thr_create_args *uap)
71 /* ucontext_t *ctx, long *id, int flags */
77 struct ksegrp *kg, *newkg;
82 if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
85 /* Have race condition but it is cheap */
86 if ((p->p_numksegrps >= max_groups_per_proc) ||
87 (p->p_numthreads >= max_threads_per_proc)) {
90 /* Initialize our td and new ksegrp.. */
91 newtd = thread_alloc();
93 newkg = ksegrp_alloc();
97 * Try the copyout as soon as we allocate the td so we don't have to
98 * tear things down in a failure case below.
101 if ((error = copyout(&id, uap->id, sizeof(long)))) {
108 bzero(&newtd->td_startzero,
109 (unsigned) RANGEOF(struct thread, td_startzero, td_endzero));
110 bcopy(&td->td_startcopy, &newtd->td_startcopy,
111 (unsigned) RANGEOF(struct thread, td_startcopy, td_endcopy));
114 bzero(&newkg->kg_startzero,
115 (unsigned)RANGEOF(struct ksegrp, kg_startzero, kg_endzero));
116 bcopy(&kg->kg_startcopy, &newkg->kg_startcopy,
117 (unsigned)RANGEOF(struct ksegrp, kg_startcopy, kg_endcopy));
120 newtd->td_proc = td->td_proc;
121 newtd->td_ucred = crhold(td->td_ucred);
123 /* Set up our machine context. */
124 cpu_set_upcall(newtd, td);
125 error = set_mcontext(newtd, &ctx.uc_mcontext);
130 crfree(td->td_ucred);
134 /* Link the thread and kse into the ksegrp and make it runnable. */
135 PROC_LOCK(td->td_proc);
137 sched_init_concurrency(newkg);
139 if ((td->td_proc->p_flag & P_HADTHREADS) == 0) {
140 sched_set_concurrency(kg,
141 thr_concurrency ? thr_concurrency : (2*mp_ncpus));
145 td->td_proc->p_flag |= P_HADTHREADS;
146 newtd->td_sigmask = td->td_sigmask;
147 mtx_lock_spin(&sched_lock);
149 ksegrp_link(newkg, p);
150 thread_link(newtd, newkg);
151 mtx_unlock_spin(&sched_lock);
154 /* let the scheduler know about these things. */
155 mtx_lock_spin(&sched_lock);
157 sched_fork_ksegrp(td, newkg);
158 sched_fork_thread(td, newtd);
160 TD_SET_CAN_RUN(newtd);
161 if ((uap->flags & THR_SUSPENDED) == 0)
162 setrunqueue(newtd, SRQ_BORING);
164 mtx_unlock_spin(&sched_lock);
171 thr_self(struct thread *td, struct thr_self_args *uap)
178 if ((error = copyout(&id, uap->id, sizeof(long))))
185 thr_exit(struct thread *td, struct thr_exit_args *uap)
193 mtx_lock_spin(&sched_lock);
196 * Shutting down last thread in the proc. This will actually
197 * call exit() in the trampoline when it returns.
199 if (p->p_numthreads != 1) {
203 mtx_unlock_spin(&sched_lock);
209 thr_kill(struct thread *td, struct thr_kill_args *uap)
210 /* long id, int sig */
219 FOREACH_THREAD_IN_PROC(p, ttd) {
220 if (ttd->td_tid == uap->id)
229 if (!_SIG_VALID(uap->sig)) {
233 tdsignal(ttd, uap->sig, SIGTARGET_TD);
240 thr_suspend(struct thread *td, struct thr_suspend_args *uap)
241 /* const struct timespec *timeout */
250 if (uap->timeout != NULL) {
251 error = copyin((const void *)uap->timeout, (void *)&ts,
252 sizeof(struct timespec));
255 if (ts.tv_nsec < 0 || ts.tv_nsec > 1000000000)
257 if (ts.tv_sec == 0 && ts.tv_nsec == 0)
259 TIMESPEC_TO_TIMEVAL(&tv, &ts);
262 PROC_LOCK(td->td_proc);
263 if ((td->td_flags & TDF_THRWAKEUP) == 0)
264 error = msleep((void *)td, &td->td_proc->p_mtx,
265 td->td_priority | PCATCH, "lthr", hz);
266 mtx_lock_spin(&sched_lock);
267 td->td_flags &= ~TDF_THRWAKEUP;
268 mtx_unlock_spin(&sched_lock);
269 PROC_UNLOCK(td->td_proc);
270 return (error == EWOULDBLOCK ? ETIMEDOUT : error);
274 thr_wake(struct thread *td, struct thr_wake_args *uap)
279 PROC_LOCK(td->td_proc);
280 FOREACH_THREAD_IN_PROC(td->td_proc, ttd) {
281 if (ttd->td_tid == uap->id)
285 PROC_UNLOCK(td->td_proc);
288 mtx_lock_spin(&sched_lock);
289 ttd->td_flags |= TDF_THRWAKEUP;
290 mtx_unlock_spin(&sched_lock);
291 wakeup_one((void *)ttd);
292 PROC_UNLOCK(td->td_proc);