diff options
Diffstat (limited to 'lib/libpthread/thread/thr_sigwait.c')
| -rw-r--r-- | lib/libpthread/thread/thr_sigwait.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/lib/libpthread/thread/thr_sigwait.c b/lib/libpthread/thread/thr_sigwait.c new file mode 100644 index 0000000..6f60653 --- /dev/null +++ b/lib/libpthread/thread/thr_sigwait.c @@ -0,0 +1,202 @@ +//depot/projects/kse/lib/libpthread/thread/thr_sigwait.c#1 - branch change 15154 (text+ko) +/* + * Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by John Birrell. + * 4. Neither the name of the author nor the names of any co-contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ +#include <signal.h> +#include <sys/param.h> +#include <sys/signalvar.h> +#include <errno.h> +#include <pthread.h> +#include "thr_private.h" + +__weak_reference(__sigwait, sigwait); +__weak_reference(__sigtimedwait, sigtimedwait); +__weak_reference(__sigwaitinfo, sigwaitinfo); + +static int +lib_sigtimedwait(const sigset_t *set, siginfo_t *info, + const struct timespec * timeout) +{ + struct pthread *curthread = _get_curthread(); + int ret = 0; + int i; + struct sigwait_data waitdata; + sigset_t waitset; + kse_critical_t crit; + siginfo_t siginfo; + + if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) { + if (info == NULL) + info = &siginfo; + return (__sys_sigtimedwait((sigset_t *)set, info, + (struct timespec *)timeout)); + } + + /* + * Initialize the set of signals that will be waited on: + */ + waitset = *set; + + /* These signals can't be waited on. */ + SIGDELSET(waitset, SIGKILL); + SIGDELSET(waitset, SIGSTOP); + + /* + * POSIX says that the _application_ must explicitly install + * a dummy handler for signals that are SIG_IGN in order + * to sigwait on them. Note that SIG_IGN signals are left in + * the mask because a subsequent sigaction could enable an + * ignored signal. + */ + + crit = _kse_critical_enter(); + KSE_SCHED_LOCK(curthread->kse, curthread->kseg); + for (i = 1; i <= _SIG_MAXSIG; ++i) { + if (SIGISMEMBER(waitset, i) && + SIGISMEMBER(curthread->sigpend, i)) { + SIGDELSET(curthread->sigpend, i); + siginfo = curthread->siginfo[i - 1]; + KSE_SCHED_UNLOCK(curthread->kse, + curthread->kseg); + _kse_critical_leave(crit); + ret = i; + goto OUT; + } + } + curthread->timeout = 0; + curthread->interrupted = 0; + _thr_set_timeout(timeout); + /* Wait for a signal: */ + siginfo.si_signo = 0; + waitdata.waitset = &waitset; + waitdata.siginfo = &siginfo; + curthread->data.sigwait = &waitdata; + THR_SET_STATE(curthread, PS_SIGWAIT); + _thr_sched_switch_unlocked(curthread); + /* + * Return the signal number to the caller: + */ + if (siginfo.si_signo > 0) { + ret = siginfo.si_signo; + } else { + if (curthread->interrupted) + errno = EINTR; + else if (curthread->timeout) + errno = EAGAIN; + ret = -1; + } + curthread->timeout = 0; + curthread->interrupted = 0; + /* + * Probably unnecessary, but since it's in a union struct + * we don't know how it could be used in the future. + */ + curthread->data.sigwait = NULL; + +OUT: + if (ret > 0 && info != NULL) + *info = siginfo; + + return (ret); +} + +int +__sigtimedwait(const sigset_t *set, siginfo_t *info, + const struct timespec * timeout) +{ + struct pthread *curthread = _get_curthread(); + int ret; + + _thr_cancel_enter(curthread); + ret = lib_sigtimedwait(set, info, timeout); + _thr_cancel_leave(curthread, 1); + return (ret); +} + +int _sigtimedwait(const sigset_t *set, siginfo_t *info, + const struct timespec * timeout) +{ + return lib_sigtimedwait(set, info, timeout); +} + +int +__sigwaitinfo(const sigset_t *set, siginfo_t *info) +{ + struct pthread *curthread = _get_curthread(); + int ret; + + _thr_cancel_enter(curthread); + ret = lib_sigtimedwait(set, info, NULL); + _thr_cancel_leave(curthread, 1); + return (ret); +} + +int +_sigwaitinfo(const sigset_t *set, siginfo_t *info) +{ + return lib_sigtimedwait(set, info, NULL); +} + +int +__sigwait(const sigset_t *set, int *sig) +{ + struct pthread *curthread = _get_curthread(); + int ret; + + _thr_cancel_enter(curthread); + ret = lib_sigtimedwait(set, NULL, NULL); + if (ret > 0) { + *sig = ret; + ret = 0; + } else { + ret = errno; + } + _thr_cancel_leave(curthread, 1); + return (ret); +} + +int +_sigwait(const sigset_t *set, int *sig) +{ + int ret; + + ret = lib_sigtimedwait(set, NULL, NULL); + if (ret > 0) { + *sig = ret; + ret = 0; + } else { + ret = errno; + } + return (ret); +} + |
