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/*
** GNU Pth - The GNU Portable Threads
** Copyright (c) 1999-2004 Ralf S. Engelschall <rse@engelschall.com>
**
** This file is part of GNU Pth, a non-preemptive thread scheduling
** library which can be found at http://www.gnu.org/software/pth/.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
** USA, or contact Ralf S. Engelschall <rse@engelschall.com>.
**
** test_sig.c: Pth test program (signal handling)
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <signal.h>
#include <unistd.h>
#include "pth.h"
static pth_t child1;
static pth_t child2;
static void *inthandler(void *_arg)
{
sigset_t sigs;
int sig;
int n;
fprintf(stderr, "inthandler: enter\n");
/* unblock interrupt signal only here */
sigemptyset(&sigs);
sigaddset(&sigs, SIGINT);
pth_sigmask(SIG_UNBLOCK, &sigs, NULL);
/* but the user has to hit CTRL-C three times */
for (n = 0; n < 3; n++) {
pth_sigwait(&sigs, &sig);
fprintf(stderr, "inthandler: SIGINT received (#%d)\n", n);
}
fprintf(stderr, "inthandler: cancelling child1 and child2\n");
pth_cancel(child1);
pth_cancel(child2);
fprintf(stderr, "inthandler: leave\n");
return NULL;
}
static void child_cleanup(void *arg)
{
fprintf(stderr, "%s: running cleanup\n", (char *)arg);
return;
}
static void *child(void *_arg)
{
sigset_t sigs;
char *name = (char *)_arg;
int i;
fprintf(stderr, "%s: enter\n", name);
/* establish cleanup handler */
pth_cleanup_push(child_cleanup, name);
/* block different types of signals */
pth_sigmask(SIG_SETMASK, NULL, &sigs);
sigaddset(&sigs, SIGINT);
if (strcmp(name, "child1") == 0) {
sigaddset(&sigs, SIGUSR1);
sigdelset(&sigs, SIGUSR2);
}
else {
sigdelset(&sigs, SIGUSR1);
sigaddset(&sigs, SIGUSR2);
}
pth_sigmask(SIG_SETMASK, &sigs, NULL);
/* do a little bit of processing and show signal states */
for (i = 0; i < 10; i++) {
pth_sigmask(SIG_SETMASK, NULL, &sigs);
fprintf(stderr, "%s: SIGUSR1: %s\n", name,
sigismember(&sigs, SIGUSR1) ? "blocked" : "unblocked");
fprintf(stderr, "%s: SIGUSR2: %s\n", name,
sigismember(&sigs, SIGUSR2) ? "blocked" : "unblocked");
fprintf(stderr, "%s: leave to scheduler\n", name);
pth_sleep(1);
fprintf(stderr, "%s: reentered from scheduler\n", name);
}
fprintf(stderr, "%s: leave\n", name);
return NULL;
}
int main(int argc, char *argv[])
{
pth_attr_t attr;
sigset_t sigs;
pth_init();
fprintf(stderr, "This is TEST_SIG, a Pth test using signals.\n");
fprintf(stderr, "\n");
fprintf(stderr, "Hit CTRL-C three times to stop this test.\n");
fprintf(stderr, "But only after all threads were terminated.\n");
fprintf(stderr, "\n");
fprintf(stderr, "main: init\n");
/* block signals */
pth_sigmask(SIG_SETMASK, NULL, &sigs);
sigaddset(&sigs, SIGUSR1);
sigaddset(&sigs, SIGUSR2);
sigaddset(&sigs, SIGINT);
pth_sigmask(SIG_SETMASK, &sigs, NULL);
/* spawn childs */
attr = pth_attr_new();
pth_attr_set(attr, PTH_ATTR_NAME, "child1");
child1 = pth_spawn(attr, child, (void *)"child1");
pth_attr_set(attr, PTH_ATTR_NAME, "child2");
child2 = pth_spawn(attr, child, (void *)"child2");
pth_attr_set(attr, PTH_ATTR_NAME, "inthandler");
pth_spawn(attr, inthandler, (void *)"inthandler");
pth_attr_destroy(attr);
/* wait until childs are finished */
while (pth_join(NULL, NULL));
fprintf(stderr, "main: exit\n");
pth_kill();
return 0;
}
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