freebsd-dev/lib/libc_r/uthread/uthread_sig.c
Julian Elischer c840cec7c5 Submitted by: John Birrell
uthreads update from the author.
1997-02-05 23:26:09 +00:00

168 lines
5.0 KiB
C

/*
* Copyright (c) 1995 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 REGENTS 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.
*
*/
#include <signal.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"
void
_thread_sig_handler(int sig, int code, struct sigcontext * scp)
{
char c;
int i;
pthread_t pthread;
/*
* Check if the pthread kernel has unblocked signals (or is about to)
* and was on its way into a _thread_sys_select when the current
* signal interrupted it:
*/
if (_thread_kern_in_select) {
/* Cast the signal number to a character variable: */
c = sig;
/*
* Write the signal number to the kernel pipe so that it will
* be ready to read when this signal handler returns. This
* means that the _thread_sys_select call will complete
* immediately.
*/
if (_thread_sys_write(_thread_kern_pipe[1], &c, 1) != 1) {
}
}
/* Check if the signal requires a dump of thread information: */
if (sig == SIGINFO) {
/* Dump thread information to file: */
_thread_dump_info();
} else {
/* Handle depending on signal type: */
switch (sig) {
/* Interval timer used for timeslicing: */
case SIGVTALRM:
/*
* Don't add the signal to any thread. Just want to
* call the scheduler:
*/
break;
/* Child termination: */
case SIGCHLD:
/*
* Enter a loop to process each thread in the linked
* list:
*/
for (pthread = _thread_link_list; pthread != NULL;
pthread = pthread->nxt) {
/*
* Add the signal to the set of pending
* signals:
*/
pthread->sigpend[sig] += 1;
if (pthread->state == PS_WAIT_WAIT) {
/* Reset the error: */
/* There should be another flag so that this is not required! ### */
_thread_seterrno(pthread, 0);
/* Change the state of the thread to run: */
PTHREAD_NEW_STATE(pthread,PS_RUNNING);
}
}
/*
* Go through the file list and set all files
* to non-blocking again in case the child
* set some of them to block. Sigh.
*/
for (i = 0; i < _thread_dtablesize; i++) {
/* Check if this file is used: */
if (_thread_fd_table[i] != NULL) {
/* Set the file descriptor to non-blocking: */
_thread_sys_fcntl(i, F_SETFL, _thread_fd_table[i]->flags | O_NONBLOCK);
}
}
break;
/* Signals specific to the running thread: */
case SIGBUS:
case SIGEMT:
case SIGFPE:
case SIGILL:
case SIGPIPE:
case SIGSEGV:
case SIGSYS:
/* Add the signal to the set of pending signals: */
_thread_run->sigpend[sig] += 1;
break;
/* Signals to send to all threads: */
default:
/*
* Enter a loop to process each thread in the linked
* list:
*/
for (pthread = _thread_link_list; pthread != NULL;
pthread = pthread->nxt) {
/*
* Add the signal to the set of pending
* signals:
*/
pthread->sigpend[sig] += 1;
}
break;
}
/* Check if the kernel is not locked: */
if (_thread_run != &_thread_kern_thread) {
/*
* Schedule the next thread. This function is not
* expected to return because it will do a longjmp
* instead.
*/
_thread_kern_sched(scp);
/*
* This point should not be reached, so abort the
* process:
*/
PANIC("Returned to signal function from scheduler");
}
}
/* Returns nothing. */
return;
}
#endif