c1df5a1a5d
should not return ERESTART after it caught a signal, otherwise thr_wake() call will be lost, also a timeout wait should not be restarted. Final, using wakeup not wakeup_one to be safeness.
306 lines
7.3 KiB
C
306 lines
7.3 KiB
C
/*
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* Copyright (c) 2003, Jeffrey Roberson <jeff@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/sched.h>
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#include <sys/sysctl.h>
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#include <sys/smp.h>
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#include <sys/sysent.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/signalvar.h>
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#include <sys/ucontext.h>
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#include <sys/thr.h>
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#include <machine/frame.h>
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extern int max_threads_per_proc;
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extern int max_groups_per_proc;
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SYSCTL_DECL(_kern_threads);
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static int thr_scope_sys = 0;
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SYSCTL_INT(_kern_threads, OID_AUTO, thr_scope_sys, CTLFLAG_RW,
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&thr_scope_sys, 0, "sys or proc scope scheduling");
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static int thr_concurrency = 0;
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SYSCTL_INT(_kern_threads, OID_AUTO, thr_concurrency, CTLFLAG_RW,
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&thr_concurrency, 0, "a concurrency value if not default");
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/*
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* System call interface.
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*/
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int
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thr_create(struct thread *td, struct thr_create_args *uap)
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/* ucontext_t *ctx, long *id, int flags */
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{
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struct thread *newtd;
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ucontext_t ctx;
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long id;
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int error;
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struct ksegrp *kg, *newkg;
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struct proc *p;
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int scope_sys;
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p = td->td_proc;
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kg = td->td_ksegrp;
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if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
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return (error);
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/* Have race condition but it is cheap */
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if ((p->p_numksegrps >= max_groups_per_proc) ||
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(p->p_numthreads >= max_threads_per_proc)) {
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return (EPROCLIM);
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}
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scope_sys = thr_scope_sys;
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/* Initialize our td and new ksegrp.. */
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newtd = thread_alloc();
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if (scope_sys)
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newkg = ksegrp_alloc();
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else
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newkg = kg;
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/*
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* Try the copyout as soon as we allocate the td so we don't have to
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* tear things down in a failure case below.
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*/
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id = newtd->td_tid;
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if ((error = copyout(&id, uap->id, sizeof(long)))) {
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if (scope_sys)
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ksegrp_free(newkg);
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thread_free(newtd);
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return (error);
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}
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bzero(&newtd->td_startzero,
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__rangeof(struct thread, td_startzero, td_endzero));
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bcopy(&td->td_startcopy, &newtd->td_startcopy,
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__rangeof(struct thread, td_startcopy, td_endcopy));
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if (scope_sys) {
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bzero(&newkg->kg_startzero,
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__rangeof(struct ksegrp, kg_startzero, kg_endzero));
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bcopy(&kg->kg_startcopy, &newkg->kg_startcopy,
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__rangeof(struct ksegrp, kg_startcopy, kg_endcopy));
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}
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newtd->td_proc = td->td_proc;
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newtd->td_ucred = crhold(td->td_ucred);
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/* Set up our machine context. */
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cpu_set_upcall(newtd, td);
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error = set_mcontext(newtd, &ctx.uc_mcontext);
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if (error != 0) {
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if (scope_sys)
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ksegrp_free(newkg);
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thread_free(newtd);
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crfree(td->td_ucred);
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goto out;
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}
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/* Link the thread and kse into the ksegrp and make it runnable. */
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PROC_LOCK(td->td_proc);
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if (scope_sys) {
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sched_init_concurrency(newkg);
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} else {
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if ((td->td_proc->p_flag & P_HADTHREADS) == 0) {
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sched_set_concurrency(kg,
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thr_concurrency ? thr_concurrency : (2*mp_ncpus));
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}
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}
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td->td_proc->p_flag |= P_HADTHREADS;
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newtd->td_sigmask = td->td_sigmask;
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mtx_lock_spin(&sched_lock);
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if (scope_sys)
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ksegrp_link(newkg, p);
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thread_link(newtd, newkg);
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mtx_unlock_spin(&sched_lock);
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PROC_UNLOCK(p);
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/* let the scheduler know about these things. */
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mtx_lock_spin(&sched_lock);
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if (scope_sys)
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sched_fork_ksegrp(td, newkg);
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sched_fork_thread(td, newtd);
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TD_SET_CAN_RUN(newtd);
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if ((uap->flags & THR_SUSPENDED) == 0)
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setrunqueue(newtd, SRQ_BORING);
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mtx_unlock_spin(&sched_lock);
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out:
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return (error);
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}
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int
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thr_self(struct thread *td, struct thr_self_args *uap)
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/* long *id */
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{
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long id;
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int error;
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id = td->td_tid;
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if ((error = copyout(&id, uap->id, sizeof(long))))
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return (error);
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return (0);
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}
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int
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thr_exit(struct thread *td, struct thr_exit_args *uap)
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/* long *state */
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{
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struct proc *p;
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p = td->td_proc;
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/* Signal userland that it can free the stack. */
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if ((void *)uap->state != NULL)
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suword((void *)uap->state, 1);
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PROC_LOCK(p);
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mtx_lock_spin(&sched_lock);
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/*
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* Shutting down last thread in the proc. This will actually
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* call exit() in the trampoline when it returns.
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*/
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if (p->p_numthreads != 1) {
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thread_exit();
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/* NOTREACHED */
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}
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mtx_unlock_spin(&sched_lock);
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PROC_UNLOCK(p);
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return (0);
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}
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int
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thr_kill(struct thread *td, struct thr_kill_args *uap)
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/* long id, int sig */
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{
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struct thread *ttd;
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struct proc *p;
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int error;
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p = td->td_proc;
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error = 0;
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PROC_LOCK(p);
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FOREACH_THREAD_IN_PROC(p, ttd) {
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if (ttd->td_tid == uap->id)
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break;
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}
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if (ttd == NULL) {
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error = ESRCH;
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goto out;
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}
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if (uap->sig == 0)
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goto out;
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if (!_SIG_VALID(uap->sig)) {
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error = EINVAL;
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goto out;
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}
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tdsignal(ttd, uap->sig, SIGTARGET_TD);
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out:
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PROC_UNLOCK(p);
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return (error);
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}
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int
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thr_suspend(struct thread *td, struct thr_suspend_args *uap)
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/* const struct timespec *timeout */
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{
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struct timespec ts;
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struct timeval tv;
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int error;
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int hz;
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hz = 0;
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error = 0;
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if (uap->timeout != NULL) {
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error = copyin((const void *)uap->timeout, (void *)&ts,
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sizeof(struct timespec));
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if (error != 0)
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return (error);
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if (ts.tv_nsec < 0 || ts.tv_nsec > 1000000000)
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return (EINVAL);
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if (ts.tv_sec == 0 && ts.tv_nsec == 0)
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return (ETIMEDOUT);
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TIMESPEC_TO_TIMEVAL(&tv, &ts);
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hz = tvtohz(&tv);
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}
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PROC_LOCK(td->td_proc);
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if ((td->td_flags & TDF_THRWAKEUP) == 0)
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error = msleep((void *)td, &td->td_proc->p_mtx,
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td->td_priority | PCATCH, "lthr", hz);
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if (td->td_flags & TDF_THRWAKEUP) {
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mtx_lock_spin(&sched_lock);
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td->td_flags &= ~TDF_THRWAKEUP;
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mtx_unlock_spin(&sched_lock);
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PROC_UNLOCK(td->td_proc);
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return (0);
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}
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PROC_UNLOCK(td->td_proc);
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if (error == EWOULDBLOCK)
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error = ETIMEDOUT;
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else if (error == ERESTART) {
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if (hz != 0)
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error = EINTR;
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}
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return (error);
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}
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int
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thr_wake(struct thread *td, struct thr_wake_args *uap)
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/* long id */
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{
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struct thread *ttd;
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PROC_LOCK(td->td_proc);
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FOREACH_THREAD_IN_PROC(td->td_proc, ttd) {
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if (ttd->td_tid == uap->id)
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break;
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}
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if (ttd == NULL) {
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PROC_UNLOCK(td->td_proc);
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return (ESRCH);
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}
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mtx_lock_spin(&sched_lock);
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ttd->td_flags |= TDF_THRWAKEUP;
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mtx_unlock_spin(&sched_lock);
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wakeup((void *)ttd);
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PROC_UNLOCK(td->td_proc);
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return (0);
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}
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