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 * System call interface.
64 thr_create(struct thread *td, struct thr_create_args *uap)
65 /* ucontext_t *ctx, long *id, int flags */
71 struct ksegrp *kg, *newkg;
77 if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
80 /* Have race condition but it is cheap */
81 if ((p->p_numksegrps >= max_groups_per_proc) ||
82 (p->p_numthreads >= max_threads_per_proc)) {
86 scope_sys = thr_scope_sys;
87 /* Initialize our td and new ksegrp.. */
88 newtd = thread_alloc();
90 newkg = ksegrp_alloc();
94 * Try the copyout as soon as we allocate the td so we don't have to
95 * tear things down in a failure case below.
98 if ((error = copyout(&id, uap->id, sizeof(long)))) {
105 bzero(&newtd->td_startzero,
106 __rangeof(struct thread, td_startzero, td_endzero));
107 bcopy(&td->td_startcopy, &newtd->td_startcopy,
108 __rangeof(struct thread, td_startcopy, td_endcopy));
111 bzero(&newkg->kg_startzero,
112 __rangeof(struct ksegrp, kg_startzero, kg_endzero));
113 bcopy(&kg->kg_startcopy, &newkg->kg_startcopy,
114 __rangeof(struct ksegrp, kg_startcopy, kg_endcopy));
117 newtd->td_proc = td->td_proc;
118 newtd->td_ucred = crhold(td->td_ucred);
120 /* Set up our machine context. */
121 cpu_set_upcall(newtd, td);
122 error = set_mcontext(newtd, &ctx.uc_mcontext);
127 crfree(td->td_ucred);
131 /* Link the thread and kse into the ksegrp and make it runnable. */
132 PROC_LOCK(td->td_proc);
134 sched_init_concurrency(newkg);
136 if ((td->td_proc->p_flag & P_HADTHREADS) == 0) {
137 sched_set_concurrency(kg,
138 thr_concurrency ? thr_concurrency : (2*mp_ncpus));
142 td->td_proc->p_flag |= P_HADTHREADS;
143 newtd->td_sigmask = td->td_sigmask;
144 mtx_lock_spin(&sched_lock);
146 ksegrp_link(newkg, p);
147 thread_link(newtd, newkg);
148 mtx_unlock_spin(&sched_lock);
151 /* let the scheduler know about these things. */
152 mtx_lock_spin(&sched_lock);
154 sched_fork_ksegrp(td, newkg);
155 sched_fork_thread(td, newtd);
157 TD_SET_CAN_RUN(newtd);
158 if ((uap->flags & THR_SUSPENDED) == 0)
159 setrunqueue(newtd, SRQ_BORING);
161 mtx_unlock_spin(&sched_lock);
168 thr_self(struct thread *td, struct thr_self_args *uap)
175 if ((error = copyout(&id, uap->id, sizeof(long))))
182 thr_exit(struct thread *td, struct thr_exit_args *uap)
189 /* Signal userland that it can free the stack. */
190 if ((void *)uap->state != NULL)
191 suword((void *)uap->state, 1);
194 mtx_lock_spin(&sched_lock);
197 * Shutting down last thread in the proc. This will actually
198 * call exit() in the trampoline when it returns.
200 if (p->p_numthreads != 1) {
204 mtx_unlock_spin(&sched_lock);
210 thr_kill(struct thread *td, struct thr_kill_args *uap)
211 /* long id, int sig */
220 FOREACH_THREAD_IN_PROC(p, ttd) {
221 if (ttd->td_tid == uap->id)
230 if (!_SIG_VALID(uap->sig)) {
234 tdsignal(ttd, uap->sig, SIGTARGET_TD);
241 thr_suspend(struct thread *td, struct thr_suspend_args *uap)
242 /* const struct timespec *timeout */
251 if (uap->timeout != NULL) {
252 error = copyin((const void *)uap->timeout, (void *)&ts,
253 sizeof(struct timespec));
256 if (ts.tv_nsec < 0 || ts.tv_nsec > 1000000000)
258 if (ts.tv_sec == 0 && ts.tv_nsec == 0)
260 TIMESPEC_TO_TIMEVAL(&tv, &ts);
263 PROC_LOCK(td->td_proc);
264 if ((td->td_flags & TDF_THRWAKEUP) == 0)
265 error = msleep((void *)td, &td->td_proc->p_mtx,
266 td->td_priority | PCATCH, "lthr", hz);
267 if (td->td_flags & TDF_THRWAKEUP) {
268 mtx_lock_spin(&sched_lock);
269 td->td_flags &= ~TDF_THRWAKEUP;
270 mtx_unlock_spin(&sched_lock);
271 PROC_UNLOCK(td->td_proc);
274 PROC_UNLOCK(td->td_proc);
275 if (error == EWOULDBLOCK)
277 else if (error == ERESTART) {
285 thr_wake(struct thread *td, struct thr_wake_args *uap)
290 PROC_LOCK(td->td_proc);
291 FOREACH_THREAD_IN_PROC(td->td_proc, ttd) {
292 if (ttd->td_tid == uap->id)
296 PROC_UNLOCK(td->td_proc);
299 mtx_lock_spin(&sched_lock);
300 ttd->td_flags |= TDF_THRWAKEUP;
301 mtx_unlock_spin(&sched_lock);
303 PROC_UNLOCK(td->td_proc);