00c301540e
this manually. This will facilitate the unrolling of giant. - Don't allow giant to recurse anymore. This should never happen.
155 lines
3.9 KiB
C
155 lines
3.9 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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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/signalvar.h>
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#include <sys/time.h>
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#include <sys/timespec.h>
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#include <pthread.h>
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#include <signal.h>
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#include <errno.h>
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#include "thr_private.h"
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/* XXX Why can't I get this from time.h? :-( */
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#define timespecsub(vvp, uvp) \
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do { \
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(vvp)->tv_sec -= (uvp)->tv_sec; \
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(vvp)->tv_nsec -= (uvp)->tv_nsec; \
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if ((vvp)->tv_nsec < 0) { \
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(vvp)->tv_sec--; \
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(vvp)->tv_nsec += 1000000000; \
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} \
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} while (0)
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static sigset_t restore;
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void
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GIANT_LOCK(pthread_t pthread)
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{
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sigset_t set;
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sigset_t sav;
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int error;
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/*
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* Block all signals.
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*/
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SIGFILLSET(set);
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/*
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* We can not use the global 'restore' set until after we have
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* acquired the giant lock.
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*/
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#if 0
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error = __sys_sigprocmask(SIG_SETMASK, &set, &sav);
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if (error) {
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_thread_printf(0, "GIANT_LOCK: sig err %d\n", errno);
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abort();
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}
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#endif
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error = umtx_lock(&_giant_mutex, pthread->thr_id);
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if (error) {
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_thread_printf(0, "GIANT_LOCK: %d\n", errno);
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abort();
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}
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restore = sav;
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}
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void
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GIANT_UNLOCK(pthread_t pthread)
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{
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sigset_t set;
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int error;
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/*
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* restore is protected by giant. We could restore our signal state
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* incorrectly if someone else set restore between unlocking giant
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* and restoring the signal mask. To avoid this we cache a copy prior
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* to the unlock.
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*/
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set = restore;
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error = umtx_unlock(&_giant_mutex, pthread->thr_id);
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if (error) {
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_thread_printf(0, "GIANT_UNLOCK: %d\n", errno);
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abort();
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}
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#if 0
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/*
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* Restore signals.
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*/
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error = __sys_sigprocmask(SIG_SETMASK, &set, NULL);
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if (error) {
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_thread_printf(0, "GIANT_UNLOCK: sig err %d\n", errno);
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abort();
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}
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#endif
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}
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int
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_thread_suspend(pthread_t pthread, struct timespec *abstime)
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{
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struct timespec remaining;
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struct timespec *ts;
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siginfo_t info;
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sigset_t set;
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int error;
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/*
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* Catch SIGTHR.
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*/
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SIGFILLSET(set);
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SIGDELSET(set, SIGTHR);
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/*
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* Compute the remainder of the run time.
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*/
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if (abstime) {
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struct timespec now;
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struct timeval tv;
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GET_CURRENT_TOD(tv);
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TIMEVAL_TO_TIMESPEC(&tv, &now);
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remaining = *abstime;
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timespecsub(&remaining, &now);
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ts = &remaining;
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} else
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ts = NULL;
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error = sigtimedwait(&set, &info, ts);
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if (error == -1)
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error = errno;
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return (error);
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}
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