condwait_test.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>

static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;

static int okexit = 0;

void *
thr_start(void *data)
{

	pthread_mutex_lock(&mut);
	while (!okexit) {
		pthread_cond_wait(&cond, &mut);
	}
	pthread_mutex_unlock(&mut);

	printf("Thread exiting\n");
	fflush(stdout);

	return NULL;
}

int
main(int ac, char **av)
{
	pthread_t thr;

	if (pthread_create(&thr, NULL, thr_start, NULL) != 0)
		exit(1);

	sleep(2);

	pthread_mutex_lock(&mut);
	okexit = 1;
	pthread_cond_signal(&cond);
	pthread_mutex_unlock(&mut);

	pthread_join(thr, NULL);

	return 0;
}