diff options
Diffstat (limited to 'lib/libthr/thread/thr_sig.c')
| -rw-r--r-- | lib/libthr/thread/thr_sig.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/lib/libthr/thread/thr_sig.c b/lib/libthr/thread/thr_sig.c new file mode 100644 index 0000000..1410059 --- /dev/null +++ b/lib/libthr/thread/thr_sig.c @@ -0,0 +1,245 @@ +/* + * Copyright (c) 1995-1998 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 <sys/param.h> +#include <sys/types.h> +#include <sys/signalvar.h> +#include <signal.h> +#include <errno.h> +#include <fcntl.h> +#include <unistd.h> +#include <string.h> +#include <pthread.h> + +#include "thr_private.h" + +/* #define DEBUG_SIGNAL */ +#ifdef DEBUG_SIGNAL +#define DBG_MSG stdout_debug +#else +#define DBG_MSG(x...) +#endif + +static void +sigcancel_handler(int sig, siginfo_t *info, ucontext_t *ucp) +{ + struct pthread *curthread = _get_curthread(); + + if (curthread->cancelflags & THR_CANCEL_AT_POINT) + pthread_testcancel(); + if (curthread->flags & THR_FLAGS_NEED_SUSPEND) { + __sys_sigprocmask(SIG_SETMASK, &ucp->uc_sigmask, NULL); + _thr_suspend_check(curthread); + } +} + +void +_thr_suspend_check(struct pthread *curthread) +{ + long cycle; + + /* Async suspend. */ + _thr_signal_block(curthread); + THR_LOCK(curthread); + if ((curthread->flags & (THR_FLAGS_NEED_SUSPEND | THR_FLAGS_SUSPENDED)) + == THR_FLAGS_NEED_SUSPEND) { + curthread->flags |= THR_FLAGS_SUSPENDED; + while (curthread->flags & THR_FLAGS_NEED_SUSPEND) { + cycle = curthread->cycle; + THR_UNLOCK(curthread); + _thr_signal_unblock(curthread); + _thr_umtx_wait(&curthread->cycle, cycle, NULL); + _thr_signal_block(curthread); + THR_LOCK(curthread); + } + curthread->flags &= ~THR_FLAGS_SUSPENDED; + } + THR_UNLOCK(curthread); + _thr_signal_unblock(curthread); +} + +void +_thr_signal_init(void) +{ + struct sigaction act; + + /* Install cancel handler. */ + SIGEMPTYSET(act.sa_mask); + act.sa_flags = SA_SIGINFO | SA_RESTART; + act.sa_sigaction = (__siginfohandler_t *)&sigcancel_handler; + __sys_sigaction(SIGCANCEL, &act, NULL); +} + +void +_thr_signal_deinit(void) +{ +} + +__weak_reference(_sigaction, sigaction); + +int +_sigaction(int sig, const struct sigaction * act, struct sigaction * oact) +{ + /* Check if the signal number is out of range: */ + if (sig < 1 || sig > _SIG_MAXSIG || sig == SIGCANCEL) { + /* Return an invalid argument: */ + errno = EINVAL; + return (-1); + } + + return __sys_sigaction(sig, act, oact); +} + +__weak_reference(_sigprocmask, sigprocmask); + +int +_sigprocmask(int how, const sigset_t *set, sigset_t *oset) +{ + const sigset_t *p = set; + sigset_t newset; + + if (how != SIG_UNBLOCK) { + if (set != NULL) { + newset = *set; + SIGDELSET(newset, SIGCANCEL); + p = &newset; + } + } + return (__sys_sigprocmask(how, p, oset)); +} + +__weak_reference(_pthread_sigmask, pthread_sigmask); + +int +_pthread_sigmask(int how, const sigset_t *set, sigset_t *oset) +{ + if (_sigprocmask(how, set, oset)) + return (errno); + return (0); +} + +__weak_reference(_sigsuspend, sigsuspend); + +int +_sigsuspend(const sigset_t * set) +{ + struct pthread *curthread = _get_curthread(); + sigset_t newset; + const sigset_t *pset; + int oldcancel; + int ret; + + if (SIGISMEMBER(*set, SIGCANCEL)) { + newset = *set; + SIGDELSET(newset, SIGCANCEL); + pset = &newset; + } else + pset = set; + + oldcancel = _thr_cancel_enter(curthread); + ret = __sys_sigsuspend(pset); + _thr_cancel_leave(curthread, oldcancel); + + return (ret); +} + +__weak_reference(__sigwait, sigwait); +__weak_reference(__sigtimedwait, sigtimedwait); +__weak_reference(__sigwaitinfo, sigwaitinfo); + +int +__sigtimedwait(const sigset_t *set, siginfo_t *info, + const struct timespec * timeout) +{ + struct pthread *curthread = _get_curthread(); + sigset_t newset; + const sigset_t *pset; + int oldcancel; + int ret; + + if (SIGISMEMBER(*set, SIGCANCEL)) { + newset = *set; + SIGDELSET(newset, SIGCANCEL); + pset = &newset; + } else + pset = set; + oldcancel = _thr_cancel_enter(curthread); + ret = __sys_sigtimedwait(pset, info, timeout); + _thr_cancel_leave(curthread, oldcancel); + return (ret); +} + +int +__sigwaitinfo(const sigset_t *set, siginfo_t *info) +{ + struct pthread *curthread = _get_curthread(); + sigset_t newset; + const sigset_t *pset; + int oldcancel; + int ret; + + if (SIGISMEMBER(*set, SIGCANCEL)) { + newset = *set; + SIGDELSET(newset, SIGCANCEL); + pset = &newset; + } else + pset = set; + + oldcancel = _thr_cancel_enter(curthread); + ret = __sys_sigwaitinfo(pset, info); + _thr_cancel_leave(curthread, oldcancel); + return (ret); +} + +int +__sigwait(const sigset_t *set, int *sig) +{ + struct pthread *curthread = _get_curthread(); + sigset_t newset; + const sigset_t *pset; + int oldcancel; + int ret; + + if (SIGISMEMBER(*set, SIGCANCEL)) { + newset = *set; + SIGDELSET(newset, SIGCANCEL); + pset = &newset; + } else + pset = set; + + oldcancel = _thr_cancel_enter(curthread); + ret = __sys_sigwait(pset, sig); + _thr_cancel_leave(curthread, oldcancel); + return (ret); +} |
