146 lines
3.9 KiB
C
146 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 <stdlib.h>
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#include <errno.h>
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#include <unistd.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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void
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_thread_critical_enter(pthread_t pthread)
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{
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_thread_sigblock();
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UMTX_LOCK(&pthread->lock);
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}
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void
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_thread_critical_exit(pthread_t pthread)
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{
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UMTX_UNLOCK(&pthread->lock);
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_thread_sigunblock();
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}
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void
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_thread_sigblock()
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{
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sigset_t set;
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sigset_t sav;
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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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SIGDELSET(set, SIGTRAP);
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/* If we have already blocked signals, just up the refcount */
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if (++curthread->signest > 1)
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return;
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PTHREAD_ASSERT(curthread->signest == 1,
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("Blocked signal nesting level must be 1!"));
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if (__sys_sigprocmask(SIG_SETMASK, &set, &sav)) {
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_thread_printf(STDERR_FILENO, "Critical Enter: sig err %d\n",
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errno);
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abort();
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}
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curthread->savedsig = sav;
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}
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void
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_thread_sigunblock()
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{
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sigset_t set;
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/* We might be in a nested 'blocked signal' section */
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if (--curthread->signest > 0)
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return;
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PTHREAD_ASSERT(curthread->signest == 0,
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("Non-Zero blocked signal nesting level."));
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/*
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* Restore signals.
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*/
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set = curthread->savedsig;
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if (__sys_sigprocmask(SIG_SETMASK, &set, NULL)) {
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_thread_printf(STDERR_FILENO, "Critical Exit: sig err %d\n",
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errno);
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abort();
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}
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}
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int
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_thread_suspend(pthread_t pthread, const 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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int error;
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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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/*
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* NOTE: timespecsub() makes sure the tv_nsec member >= 0.
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*/
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if (ts->tv_sec < 0)
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return (ETIMEDOUT);
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} else
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ts = NULL;
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error = thr_suspend(ts);
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return (error == -1 ? errno : error);
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}
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