167 lines
4.2 KiB
C
167 lines
4.2 KiB
C
/*
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* Copyright (c) 2003 Jeffrey Roberson <jeff@freebsd.org>
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* Copyright (c) 2003 Jonathan Mini <mini@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/param.h>
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#include <sys/types.h>
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#include <sys/signalvar.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <setjmp.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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/* #define DEBUG_SIGNAL */
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#ifdef DEBUG_SIGNAL
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#define DBG_MSG stdout_debug
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#else
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#define DBG_MSG(x...)
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#endif
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__weak_reference(_sigprocmask, sigprocmask);
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int
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_sigprocmask(int how, const sigset_t *set, sigset_t *oset)
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{
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sigset_t new;
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/*
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* Make sure applications can't unblock our synchronization
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* signal. We always want to take this with sigwait().
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*/
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if (set != NULL) {
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new = *set;
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switch (how) {
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case SIG_BLOCK:
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case SIG_SETMASK:
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SIGADDSET(new, SIGTHR);
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break;
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case SIG_UNBLOCK:
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SIGDELSET(new, SIGTHR);
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break;
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default:
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break;
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}
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set = &new;
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}
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return (__sys_sigprocmask(how, set, oset));
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}
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__weak_reference(_pthread_sigmask, pthread_sigmask);
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int
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_pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
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{
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int error;
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/*
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* This always sets the mask on the current thread.
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*/
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error = sigprocmask(how, set, oset);
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/*
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* pthread_sigmask returns errno or success while sigprocmask returns
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* -1 and sets errno.
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*/
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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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__weak_reference(_pthread_kill, pthread_kill);
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int
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_pthread_kill(pthread_t pthread, int sig)
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{
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if (_thread_initial == NULL)
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_thread_init();
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return (thr_kill(pthread->thr_id, sig));
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}
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/*
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* User thread signal handler wrapper.
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*/
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void
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_thread_sig_wrapper(int sig, siginfo_t *info, ucontext_t *context)
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{
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struct pthread_state_data psd;
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struct pthread *curthread = _get_curthread();
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__siginfohandler_t *handler;
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GIANT_LOCK(curthread);
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/* Save the thread's previous state. */
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curthread->data = psd.psd_wait_data;
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curthread->state = psd.psd_state;
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curthread->flags = psd.psd_flags;
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/* Check the threads previous state: */
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if (psd.psd_state != PS_RUNNING) {
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/*
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* Do a little cleanup handling for those threads in
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* queues before calling the signal handler. Signals
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* for these threads are temporarily blocked until
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* after cleanup handling.
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*/
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switch (psd.psd_state) {
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case PS_COND_WAIT:
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_cond_wait_backout(curthread);
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psd.psd_state = PS_RUNNING;
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break;
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case PS_MUTEX_WAIT:
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/* _mutex_lock_backout(curthread); XXXTHR */
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psd.psd_state = PS_RUNNING;
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break;
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default:
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break;
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}
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}
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if (_thread_sigact[sig -1].sa_handler != NULL) {
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GIANT_UNLOCK(curthread);
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handler = (__siginfohandler_t *)
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_thread_sigact[sig - 1].sa_handler;
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handler(sig, info, context);
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GIANT_LOCK(curthread);
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}
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/* Restore the signal frame. */
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psd.psd_wait_data = curthread->data;
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psd.psd_state = curthread->state;
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psd.psd_flags = curthread->flags &
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(PTHREAD_FLAGS_PRIVATE | PTHREAD_FLAGS_TRACE);
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GIANT_UNLOCK(curthread);
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}
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