29bcc4514f
SW_INVOL. Assert that one of these is set in mi_switch() and propery adjust the rusage statistics. This is to simplify the large number of users of this interface which were previously all required to adjust the proper counter prior to calling mi_switch(). This also facilitates more switch and locking optimizations. - Change all callers of mi_switch() to pass the appropriate paramter and remove direct references to the process statistics.
606 lines
14 KiB
C
606 lines
14 KiB
C
/*-
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* Copyright (c) 2000 Jake Burkholder <jake@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, this list of conditions and the following 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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* 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 "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/systm.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/kernel.h>
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#include <sys/ktr.h>
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#include <sys/condvar.h>
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#include <sys/sched.h>
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#include <sys/signalvar.h>
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#include <sys/resourcevar.h>
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#ifdef KTRACE
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#include <sys/uio.h>
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#include <sys/ktrace.h>
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#endif
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/*
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* Common sanity checks for cv_wait* functions.
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*/
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#define CV_ASSERT(cvp, mp, td) do { \
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KASSERT((td) != NULL, ("%s: curthread NULL", __func__)); \
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KASSERT(TD_IS_RUNNING(td), ("%s: not TDS_RUNNING", __func__)); \
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KASSERT((cvp) != NULL, ("%s: cvp NULL", __func__)); \
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KASSERT((mp) != NULL, ("%s: mp NULL", __func__)); \
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mtx_assert((mp), MA_OWNED | MA_NOTRECURSED); \
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} while (0)
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#ifdef INVARIANTS
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#define CV_WAIT_VALIDATE(cvp, mp) do { \
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if (TAILQ_EMPTY(&(cvp)->cv_waitq)) { \
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/* Only waiter. */ \
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(cvp)->cv_mtx = (mp); \
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} else { \
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/* \
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* Other waiter; assert that we're using the \
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* same mutex. \
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*/ \
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KASSERT((cvp)->cv_mtx == (mp), \
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("%s: Multiple mutexes", __func__)); \
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} \
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} while (0)
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#define CV_SIGNAL_VALIDATE(cvp) do { \
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if (!TAILQ_EMPTY(&(cvp)->cv_waitq)) { \
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KASSERT(mtx_owned((cvp)->cv_mtx), \
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("%s: Mutex not owned", __func__)); \
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} \
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} while (0)
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#else
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#define CV_WAIT_VALIDATE(cvp, mp)
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#define CV_SIGNAL_VALIDATE(cvp)
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#endif
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static void cv_timedwait_end(void *arg);
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/*
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* Initialize a condition variable. Must be called before use.
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*/
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void
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cv_init(struct cv *cvp, const char *desc)
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{
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TAILQ_INIT(&cvp->cv_waitq);
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cvp->cv_mtx = NULL;
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cvp->cv_description = desc;
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}
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/*
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* Destroy a condition variable. The condition variable must be re-initialized
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* in order to be re-used.
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*/
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void
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cv_destroy(struct cv *cvp)
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{
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KASSERT(cv_waitq_empty(cvp), ("%s: cv_waitq non-empty", __func__));
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}
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/*
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* Common code for cv_wait* functions. All require sched_lock.
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*/
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/*
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* Switch context.
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*/
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static __inline void
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cv_switch(struct thread *td)
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{
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TD_SET_SLEEPING(td);
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mi_switch(SW_VOL);
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CTR3(KTR_PROC, "cv_switch: resume thread %p (pid %d, %s)", td,
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td->td_proc->p_pid, td->td_proc->p_comm);
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}
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/*
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* Switch context, catching signals.
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*/
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static __inline int
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cv_switch_catch(struct thread *td)
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{
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struct proc *p;
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int sig;
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/*
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* We put ourselves on the sleep queue and start our timeout before
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* calling cursig, as we could stop there, and a wakeup or a SIGCONT (or
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* both) could occur while we were stopped. A SIGCONT would cause us to
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* be marked as TDS_SLP without resuming us, thus we must be ready for
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* sleep when cursig is called. If the wakeup happens while we're
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* stopped, td->td_wchan will be 0 upon return from cursig,
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* and TD_ON_SLEEPQ() will return false.
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*/
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td->td_flags |= TDF_SINTR;
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mtx_unlock_spin(&sched_lock);
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p = td->td_proc;
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PROC_LOCK(p);
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mtx_lock(&p->p_sigacts->ps_mtx);
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sig = cursig(td);
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mtx_unlock(&p->p_sigacts->ps_mtx);
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if (thread_suspend_check(1))
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sig = SIGSTOP;
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mtx_lock_spin(&sched_lock);
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PROC_UNLOCK(p);
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if (sig != 0) {
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if (TD_ON_SLEEPQ(td))
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cv_waitq_remove(td);
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TD_SET_RUNNING(td);
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} else if (TD_ON_SLEEPQ(td)) {
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cv_switch(td);
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}
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td->td_flags &= ~TDF_SINTR;
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return sig;
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}
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/*
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* Add a thread to the wait queue of a condition variable.
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*/
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static __inline void
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cv_waitq_add(struct cv *cvp, struct thread *td)
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{
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td->td_flags |= TDF_CVWAITQ;
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TD_SET_ON_SLEEPQ(td);
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td->td_wchan = cvp;
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td->td_wmesg = cvp->cv_description;
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CTR3(KTR_PROC, "cv_waitq_add: thread %p (pid %d, %s)", td,
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td->td_proc->p_pid, td->td_proc->p_comm);
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TAILQ_INSERT_TAIL(&cvp->cv_waitq, td, td_slpq);
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sched_sleep(td, td->td_priority);
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}
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/*
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* Wait on a condition variable. The current thread is placed on the condition
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* variable's wait queue and suspended. A cv_signal or cv_broadcast on the same
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* condition variable will resume the thread. The mutex is released before
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* sleeping and will be held on return. It is recommended that the mutex be
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* held when cv_signal or cv_broadcast are called.
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*/
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void
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cv_wait(struct cv *cvp, struct mtx *mp)
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{
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struct thread *td;
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WITNESS_SAVE_DECL(mp);
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td = curthread;
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_CSW))
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ktrcsw(1, 0);
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#endif
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CV_ASSERT(cvp, mp, td);
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WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, &mp->mtx_object,
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"Waiting on \"%s\"", cvp->cv_description);
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WITNESS_SAVE(&mp->mtx_object, mp);
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if (cold ) {
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/*
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* During autoconfiguration, just give interrupts
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* a chance, then just return. Don't run any other
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* thread or panic below, in case this is the idle
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* process and already asleep.
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*/
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return;
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}
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mtx_lock_spin(&sched_lock);
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CV_WAIT_VALIDATE(cvp, mp);
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DROP_GIANT();
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mtx_unlock(mp);
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cv_waitq_add(cvp, td);
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cv_switch(td);
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mtx_unlock_spin(&sched_lock);
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_CSW))
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ktrcsw(0, 0);
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#endif
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PICKUP_GIANT();
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mtx_lock(mp);
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WITNESS_RESTORE(&mp->mtx_object, mp);
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}
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/*
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* Wait on a condition variable, allowing interruption by signals. Return 0 if
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* the thread was resumed with cv_signal or cv_broadcast, EINTR or ERESTART if
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* a signal was caught. If ERESTART is returned the system call should be
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* restarted if possible.
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*/
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int
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cv_wait_sig(struct cv *cvp, struct mtx *mp)
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{
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struct thread *td;
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struct proc *p;
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int rval;
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int sig;
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WITNESS_SAVE_DECL(mp);
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td = curthread;
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p = td->td_proc;
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rval = 0;
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_CSW))
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ktrcsw(1, 0);
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#endif
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CV_ASSERT(cvp, mp, td);
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WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, &mp->mtx_object,
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"Waiting on \"%s\"", cvp->cv_description);
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WITNESS_SAVE(&mp->mtx_object, mp);
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if (cold || panicstr) {
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/*
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* After a panic, or during autoconfiguration, just give
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* interrupts a chance, then just return; don't run any other
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* procs or panic below, in case this is the idle process and
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* already asleep.
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*/
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return 0;
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}
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mtx_lock_spin(&sched_lock);
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CV_WAIT_VALIDATE(cvp, mp);
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DROP_GIANT();
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mtx_unlock(mp);
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cv_waitq_add(cvp, td);
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sig = cv_switch_catch(td);
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mtx_unlock_spin(&sched_lock);
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PROC_LOCK(p);
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mtx_lock(&p->p_sigacts->ps_mtx);
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if (sig == 0) {
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sig = cursig(td); /* XXXKSE */
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if (sig == 0 && td->td_flags & TDF_INTERRUPT)
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rval = td->td_intrval;
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}
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if (sig != 0) {
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if (SIGISMEMBER(p->p_sigacts->ps_sigintr, sig))
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rval = EINTR;
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else
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rval = ERESTART;
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}
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mtx_unlock(&p->p_sigacts->ps_mtx);
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if (p->p_flag & P_WEXIT)
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rval = EINTR;
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PROC_UNLOCK(p);
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_CSW))
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ktrcsw(0, 0);
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#endif
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PICKUP_GIANT();
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mtx_lock(mp);
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WITNESS_RESTORE(&mp->mtx_object, mp);
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return (rval);
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}
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/*
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* Wait on a condition variable for at most timo/hz seconds. Returns 0 if the
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* process was resumed by cv_signal or cv_broadcast, EWOULDBLOCK if the timeout
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* expires.
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*/
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int
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cv_timedwait(struct cv *cvp, struct mtx *mp, int timo)
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{
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struct thread *td;
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int rval;
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WITNESS_SAVE_DECL(mp);
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td = curthread;
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rval = 0;
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_CSW))
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ktrcsw(1, 0);
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#endif
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CV_ASSERT(cvp, mp, td);
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WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, &mp->mtx_object,
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"Waiting on \"%s\"", cvp->cv_description);
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WITNESS_SAVE(&mp->mtx_object, mp);
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if (cold || panicstr) {
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/*
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* After a panic, or during autoconfiguration, just give
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* interrupts a chance, then just return; don't run any other
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* thread or panic below, in case this is the idle process and
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* already asleep.
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*/
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return 0;
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}
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mtx_lock_spin(&sched_lock);
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CV_WAIT_VALIDATE(cvp, mp);
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DROP_GIANT();
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mtx_unlock(mp);
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cv_waitq_add(cvp, td);
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callout_reset(&td->td_slpcallout, timo, cv_timedwait_end, td);
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cv_switch(td);
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if (td->td_flags & TDF_TIMEOUT) {
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td->td_flags &= ~TDF_TIMEOUT;
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rval = EWOULDBLOCK;
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} else if (td->td_flags & TDF_TIMOFAIL)
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td->td_flags &= ~TDF_TIMOFAIL;
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else if (callout_stop(&td->td_slpcallout) == 0) {
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/*
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* Work around race with cv_timedwait_end similar to that
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* between msleep and endtsleep.
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* Go back to sleep.
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*/
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TD_SET_SLEEPING(td);
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mi_switch(SW_INVOL);
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td->td_flags &= ~TDF_TIMOFAIL;
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}
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mtx_unlock_spin(&sched_lock);
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_CSW))
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ktrcsw(0, 0);
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#endif
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PICKUP_GIANT();
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mtx_lock(mp);
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WITNESS_RESTORE(&mp->mtx_object, mp);
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return (rval);
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}
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/*
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* Wait on a condition variable for at most timo/hz seconds, allowing
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* interruption by signals. Returns 0 if the thread was resumed by cv_signal
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* or cv_broadcast, EWOULDBLOCK if the timeout expires, and EINTR or ERESTART if
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* a signal was caught.
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*/
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int
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cv_timedwait_sig(struct cv *cvp, struct mtx *mp, int timo)
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{
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struct thread *td;
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struct proc *p;
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int rval;
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int sig;
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WITNESS_SAVE_DECL(mp);
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td = curthread;
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p = td->td_proc;
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rval = 0;
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_CSW))
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ktrcsw(1, 0);
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#endif
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CV_ASSERT(cvp, mp, td);
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WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, &mp->mtx_object,
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"Waiting on \"%s\"", cvp->cv_description);
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WITNESS_SAVE(&mp->mtx_object, mp);
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if (cold || panicstr) {
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/*
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* After a panic, or during autoconfiguration, just give
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* interrupts a chance, then just return; don't run any other
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* thread or panic below, in case this is the idle process and
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* already asleep.
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*/
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return 0;
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}
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mtx_lock_spin(&sched_lock);
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CV_WAIT_VALIDATE(cvp, mp);
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DROP_GIANT();
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mtx_unlock(mp);
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cv_waitq_add(cvp, td);
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callout_reset(&td->td_slpcallout, timo, cv_timedwait_end, td);
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sig = cv_switch_catch(td);
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if (td->td_flags & TDF_TIMEOUT) {
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td->td_flags &= ~TDF_TIMEOUT;
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rval = EWOULDBLOCK;
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} else if (td->td_flags & TDF_TIMOFAIL)
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td->td_flags &= ~TDF_TIMOFAIL;
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else if (callout_stop(&td->td_slpcallout) == 0) {
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/*
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* Work around race with cv_timedwait_end similar to that
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* between msleep and endtsleep.
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* Go back to sleep.
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*/
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TD_SET_SLEEPING(td);
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mi_switch(SW_INVOL);
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td->td_flags &= ~TDF_TIMOFAIL;
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}
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mtx_unlock_spin(&sched_lock);
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PROC_LOCK(p);
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mtx_lock(&p->p_sigacts->ps_mtx);
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if (sig == 0) {
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sig = cursig(td);
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if (sig == 0 && td->td_flags & TDF_INTERRUPT)
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rval = td->td_intrval;
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}
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if (sig != 0) {
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if (SIGISMEMBER(p->p_sigacts->ps_sigintr, sig))
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rval = EINTR;
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else
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rval = ERESTART;
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}
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mtx_unlock(&p->p_sigacts->ps_mtx);
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if (p->p_flag & P_WEXIT)
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rval = EINTR;
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PROC_UNLOCK(p);
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_CSW))
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ktrcsw(0, 0);
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#endif
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PICKUP_GIANT();
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mtx_lock(mp);
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WITNESS_RESTORE(&mp->mtx_object, mp);
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return (rval);
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}
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/*
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* Common code for signal and broadcast. Assumes waitq is not empty. Must be
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* called with sched_lock held.
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*/
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static __inline void
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cv_wakeup(struct cv *cvp)
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{
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struct thread *td;
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mtx_assert(&sched_lock, MA_OWNED);
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td = TAILQ_FIRST(&cvp->cv_waitq);
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KASSERT(td->td_wchan == cvp, ("%s: bogus wchan", __func__));
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KASSERT(td->td_flags & TDF_CVWAITQ, ("%s: not on waitq", __func__));
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cv_waitq_remove(td);
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TD_CLR_SLEEPING(td);
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setrunnable(td);
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}
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/*
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* Signal a condition variable, wakes up one waiting thread. Will also wakeup
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* the swapper if the process is not in memory, so that it can bring the
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* sleeping process in. Note that this may also result in additional threads
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* being made runnable. Should be called with the same mutex as was passed to
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* cv_wait held.
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*/
|
|
void
|
|
cv_signal(struct cv *cvp)
|
|
{
|
|
|
|
KASSERT(cvp != NULL, ("%s: cvp NULL", __func__));
|
|
mtx_lock_spin(&sched_lock);
|
|
if (!TAILQ_EMPTY(&cvp->cv_waitq)) {
|
|
CV_SIGNAL_VALIDATE(cvp);
|
|
cv_wakeup(cvp);
|
|
}
|
|
mtx_unlock_spin(&sched_lock);
|
|
}
|
|
|
|
/*
|
|
* Broadcast a signal to a condition variable. Wakes up all waiting threads.
|
|
* Should be called with the same mutex as was passed to cv_wait held.
|
|
*/
|
|
void
|
|
cv_broadcastpri(struct cv *cvp, int pri)
|
|
{
|
|
struct thread *td;
|
|
|
|
KASSERT(cvp != NULL, ("%s: cvp NULL", __func__));
|
|
mtx_lock_spin(&sched_lock);
|
|
CV_SIGNAL_VALIDATE(cvp);
|
|
while (!TAILQ_EMPTY(&cvp->cv_waitq)) {
|
|
if (pri >= PRI_MIN && pri <= PRI_MAX) {
|
|
td = TAILQ_FIRST(&cvp->cv_waitq);
|
|
if (td->td_priority > pri)
|
|
td->td_priority = pri;
|
|
}
|
|
cv_wakeup(cvp);
|
|
}
|
|
mtx_unlock_spin(&sched_lock);
|
|
}
|
|
|
|
/*
|
|
* Remove a thread from the wait queue of its condition variable. This may be
|
|
* called externally.
|
|
*/
|
|
void
|
|
cv_waitq_remove(struct thread *td)
|
|
{
|
|
struct cv *cvp;
|
|
|
|
mtx_assert(&sched_lock, MA_OWNED);
|
|
if ((cvp = td->td_wchan) != NULL && td->td_flags & TDF_CVWAITQ) {
|
|
TAILQ_REMOVE(&cvp->cv_waitq, td, td_slpq);
|
|
td->td_flags &= ~TDF_CVWAITQ;
|
|
td->td_wmesg = NULL;
|
|
TD_CLR_ON_SLEEPQ(td);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Timeout function for cv_timedwait. Put the thread on the runqueue and set
|
|
* its timeout flag.
|
|
*/
|
|
static void
|
|
cv_timedwait_end(void *arg)
|
|
{
|
|
struct thread *td;
|
|
|
|
td = arg;
|
|
CTR3(KTR_PROC, "cv_timedwait_end: thread %p (pid %d, %s)",
|
|
td, td->td_proc->p_pid, td->td_proc->p_comm);
|
|
mtx_lock_spin(&sched_lock);
|
|
if (TD_ON_SLEEPQ(td)) {
|
|
cv_waitq_remove(td);
|
|
td->td_flags |= TDF_TIMEOUT;
|
|
} else {
|
|
td->td_flags |= TDF_TIMOFAIL;
|
|
}
|
|
TD_CLR_SLEEPING(td);
|
|
setrunnable(td);
|
|
mtx_unlock_spin(&sched_lock);
|
|
}
|
|
|
|
/*
|
|
* For now only abort interruptable waits.
|
|
* The others will have to either complete on their own or have a timeout.
|
|
*/
|
|
void
|
|
cv_abort(struct thread *td)
|
|
{
|
|
|
|
CTR3(KTR_PROC, "cv_abort: thread %p (pid %d, %s)", td,
|
|
td->td_proc->p_pid, td->td_proc->p_comm);
|
|
mtx_lock_spin(&sched_lock);
|
|
if ((td->td_flags & (TDF_SINTR|TDF_TIMEOUT)) == TDF_SINTR) {
|
|
if (TD_ON_SLEEPQ(td)) {
|
|
cv_waitq_remove(td);
|
|
}
|
|
TD_CLR_SLEEPING(td);
|
|
setrunnable(td);
|
|
}
|
|
mtx_unlock_spin(&sched_lock);
|
|
}
|
|
|