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/*
* pthread.c:
* Tiny test program to see whether POSIX threads work.
*/
static const char rcsid[] = "$Id: pthread.c,v 1.4 2005/10/26 22:56:05 chris Exp $";
#include <sys/types.h>
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
static int return_value = -1;
void *worker_thread(void *v) {
/* Record successful return and signal parent to wake up. */
return_value = 0;
pthread_mutex_lock(&mtx);
pthread_cond_signal(&cond);
pthread_mutex_unlock(&mtx);
while (1) {
sleep(1);
pthread_testcancel();
}
}
/* Start a thread, and have it set a variable to some other value, then signal
* a condition variable. If this doesn't happen within some set time, we assume
* that something's gone badly wrong and abort (for instance, the thread never
* got started). */
int main(void) {
pthread_t thr;
int res;
struct timespec deadline = {0};
if ((res = pthread_mutex_lock(&mtx)) != 0
|| (res = pthread_create(&thr, NULL, worker_thread, NULL)) != 0) {
fprintf(stderr, "%s\n", strerror(res));
return -1;
}
/* Thread should now be running; we should wait on the condition
* variable. */
do
deadline.tv_sec = 2 + time(NULL);
while ((res = pthread_cond_timedwait(&cond, &mtx, &deadline)) == EINTR);
if (res != 0) {
fprintf(stderr, "%s\n", strerror(res));
return -1;
}
if ((res = pthread_cancel(thr)) != 0
|| (res = pthread_join(thr, NULL)) != 0) {
fprintf(stderr, "%s\n", strerror(res));
return -1;
}
return return_value;
}
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