94 lines
1.7 KiB
C
94 lines
1.7 KiB
C
/* $NetBSD: cond4.c,v 1.2 2007/01/20 19:21:18 christos Exp $ */
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#include <assert.h>
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#include <err.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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void *threadfunc(void *arg);
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pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
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pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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int count, total, toggle;
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#define COUNT 50000
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int main(int argc, char *argv[])
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{
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int ret;
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pthread_t new;
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void *joinval;
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int sharedval;
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printf("1: condition variable test 4\n");
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ret = pthread_mutex_lock(&mutex);
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if (ret)
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err(1, "pthread_mutex_lock(1)");
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count = COUNT;
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toggle = 0;
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ret = pthread_create(&new, NULL, threadfunc, &sharedval);
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if (ret != 0)
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err(1, "pthread_create");
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printf("1: Before waiting.\n");
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while (count>0) {
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count--;
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total++;
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toggle = 1;
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#if 0
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printf("1: Before signal %d.\n", count);
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#endif
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pthread_cond_signal(&cond);
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do {
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pthread_cond_wait(&cond, &mutex);
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} while (toggle != 0);
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}
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printf("1: After the loop.\n");
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toggle = 1;
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pthread_mutex_unlock(&mutex);
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pthread_cond_signal(&cond);
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printf("1: After releasing the mutex.\n");
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ret = pthread_join(new, &joinval);
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if (ret != 0)
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err(1, "pthread_join");
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printf("1: Thread joined. Final count = %d, total = %d\n",
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count, total);
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assert(count == 0);
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assert(total == COUNT);
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return 0;
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}
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void *threadfunc(void *arg)
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{
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#if 0
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int *share = (int *) arg;
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#endif
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printf("2: Second thread.\n");
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pthread_mutex_lock(&mutex);
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printf("2: Before the loop.\n");
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while (count>0) {
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count--;
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total++;
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toggle = 0;
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#if 0
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printf("2: Before signal %d.\n", count);
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#endif
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pthread_cond_signal(&cond);
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do {
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pthread_cond_wait(&cond, &mutex);
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} while (toggle != 1);
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}
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printf("2: After the loop.\n");
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pthread_mutex_unlock(&mutex);
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return NULL;
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}
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