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