250 lines
7.0 KiB
C
250 lines
7.0 KiB
C
//depot/projects/kse/lib/libpthread/thread/thr_sigwait.c#1 - branch change 15154 (text+ko)
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/*
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* Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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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* $FreeBSD$
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*/
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#include <signal.h>
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#include <sys/param.h>
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#include <sys/signalvar.h>
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#include <errno.h>
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#include <pthread.h>
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#include "thr_private.h"
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__weak_reference(__sigwait, sigwait);
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__weak_reference(__sigtimedwait, sigtimedwait);
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__weak_reference(__sigwaitinfo, sigwaitinfo);
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static int
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lib_sigtimedwait(const sigset_t *set, siginfo_t *info,
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const struct timespec * timeout)
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{
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struct pthread *curthread = _get_curthread();
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int ret = 0;
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int i;
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sigset_t tempset, waitset;
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struct sigaction act;
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kse_critical_t crit;
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siginfo_t siginfo;
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if (!_kse_isthreaded()) {
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if (info == NULL)
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info = &siginfo;
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return __sys_sigtimedwait((sigset_t *)set, info,
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(struct timespec *)timeout);
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}
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/*
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* Specify the thread kernel signal handler.
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*/
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act.sa_handler = (void (*) ()) _thr_sig_handler;
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act.sa_flags = SA_RESTART | SA_SIGINFO;
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/* Ensure the signal handler cannot be interrupted by other signals: */
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SIGFILLSET(act.sa_mask);
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/*
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* Initialize the set of signals that will be waited on:
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*/
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waitset = *set;
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/* These signals can't be waited on. */
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SIGDELSET(waitset, SIGKILL);
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SIGDELSET(waitset, SIGSTOP);
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crit = _kse_critical_enter();
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KSE_LOCK_ACQUIRE(curthread->kse, &_thread_signal_lock);
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/*
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* Enter a loop to find the signals that are SIG_DFL. For
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* these signals we must install a dummy signal handler in
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* order for the kernel to pass them in to us. POSIX says
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* that the _application_ must explicitly install a dummy
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* handler for signals that are SIG_IGN in order to sigwait
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* on them. Note that SIG_IGN signals are left in the
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* mask because a subsequent sigaction could enable an
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* ignored signal.
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*/
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SIGEMPTYSET(tempset);
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for (i = 1; i <= _SIG_MAXSIG; i++) {
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if (SIGISMEMBER(waitset, i) &&
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(_thread_sigact[i - 1].sa_handler == SIG_DFL)) {
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_thread_dfl_count[i - 1]++;
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SIGADDSET(tempset, i);
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if (_thread_dfl_count[i - 1] == 1) {
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if (__sys_sigaction(i, &act, NULL) != 0)
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/* ret = -1 */;
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}
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}
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}
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if (ret == 0) {
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/* Done accessing _thread_dfl_count for now. */
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KSE_LOCK_RELEASE(curthread->kse, &_thread_signal_lock);
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KSE_SCHED_LOCK(curthread->kse, curthread->kseg);
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for (i = 1; i <= _SIG_MAXSIG; ++i) {
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if (SIGISMEMBER(waitset, i) &&
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SIGISMEMBER(curthread->sigpend, i)) {
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SIGDELSET(curthread->sigpend, i);
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*info = curthread->siginfo[i - 1];
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KSE_SCHED_UNLOCK(curthread->kse,
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curthread->kseg);
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_kse_critical_leave(crit);
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return (i);
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}
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}
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curthread->timeout = 0;
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_thr_set_timeout(timeout);
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/* Wait for a signal: */
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curthread->oldsigmask = curthread->sigmask;
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siginfo.si_signo = 0;
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curthread->data.sigwaitinfo = &siginfo;
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SIGFILLSET(curthread->sigmask);
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SIGSETNAND(curthread->sigmask, waitset);
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THR_SET_STATE(curthread, PS_SIGWAIT);
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_thr_sched_switch_unlocked(curthread);
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/*
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* Return the signal number to the caller:
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* XXX Here is race, how about a signal come in before
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* we reach here? so we might got an incorrect timeout
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* status.
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*/
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if (siginfo.si_signo > 0) {
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if (info)
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*info = siginfo;
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ret = siginfo.si_signo;
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} else {
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if (curthread->timeout)
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errno = EAGAIN;
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ret = -1;
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}
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/*
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* Probably unnecessary, but since it's in a union struct
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* we don't know how it could be used in the future.
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*/
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crit = _kse_critical_enter();
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curthread->data.sigwaitinfo = NULL;
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/*
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* Relock the array of SIG_DFL wait counts.
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*/
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KSE_LOCK_ACQUIRE(curthread->kse, &_thread_signal_lock);
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}
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/* Restore the sigactions: */
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act.sa_handler = SIG_DFL;
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for (i = 1; i <= _SIG_MAXSIG; i++) {
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if (SIGISMEMBER(tempset, i)) {
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_thread_dfl_count[i - 1]--;
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if ((_thread_sigact[i - 1].sa_handler == SIG_DFL) &&
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(_thread_dfl_count[i - 1] == 0)) {
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if (__sys_sigaction(i, &act, NULL) != 0)
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/* ret = -1 */ ;
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}
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}
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}
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/* Done accessing _thread_dfl_count. */
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KSE_LOCK_RELEASE(curthread->kse, &_thread_signal_lock);
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_kse_critical_leave(crit);
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return (ret);
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}
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int
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__sigtimedwait(const sigset_t *set, siginfo_t *info,
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const struct timespec * timeout)
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{
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struct pthread *curthread = _get_curthread();
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int ret;
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_thr_enter_cancellation_point(curthread);
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ret = lib_sigtimedwait(set, info, timeout);
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_thr_leave_cancellation_point(curthread);
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return (ret);
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}
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int _sigtimedwait(const sigset_t *set, siginfo_t *info,
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const struct timespec * timeout)
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{
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return lib_sigtimedwait(set, info, timeout);
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}
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int
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__sigwaitinfo(const sigset_t *set, siginfo_t *info)
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{
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struct pthread *curthread = _get_curthread();
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int ret;
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_thr_enter_cancellation_point(curthread);
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ret = lib_sigtimedwait(set, info, NULL);
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_thr_leave_cancellation_point(curthread);
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return (ret);
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}
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int
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_sigwaitinfo(const sigset_t *set, siginfo_t *info)
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{
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return lib_sigtimedwait(set, info, NULL);
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}
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int
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__sigwait(const sigset_t *set, int *sig)
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{
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struct pthread *curthread = _get_curthread();
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int ret;
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_thr_enter_cancellation_point(curthread);
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ret = lib_sigtimedwait(set, NULL, NULL);
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if (ret > 0) {
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*sig = ret;
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ret = 0;
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}
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else
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ret = -1;
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_thr_leave_cancellation_point(curthread);
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return (ret);
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}
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int
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_sigwait(const sigset_t *set, int *sig)
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{
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int ret;
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ret = lib_sigtimedwait(set, NULL, NULL);
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if (ret > 0) {
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*sig = ret;
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ret = 0;
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} else {
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ret = -1;
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}
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return (ret);
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}
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