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