82 lines
1.6 KiB
C
82 lines
1.6 KiB
C
/* $NetBSD: mutex2.c,v 1.2 2003/02/03 16:27:32 martin 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;
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int x;
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int
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main(int argc, char *argv[])
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{
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int count, count2, ret;
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pthread_t new;
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void *joinval;
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printf("1: Mutex-test 2\n");
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ret = pthread_mutex_init(&mutex, NULL);
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if (ret != 0)
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err(1, "pthread_mutex_init");
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x = 0;
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count = count2 = 10000000;
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ret = pthread_mutex_lock(&mutex);
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if (ret != 0)
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err(1, "pthread_mutex_lock (1)");
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ret = pthread_create(&new, NULL, threadfunc, &count2);
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if (ret != 0)
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err(1, "pthread_create");
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printf("1: Thread %p\n", pthread_self());
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ret = pthread_mutex_unlock(&mutex);
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if (ret != 0)
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err(1, "pthread_mutex_unlock(1)");
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while (count--) {
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ret = pthread_mutex_lock(&mutex);
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if (ret != 0)
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err(1, "pthread_mutex_lock(2)");
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x++;
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ret = pthread_mutex_unlock(&mutex);
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if (ret != 0)
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err(1, "pthread_mutex_unlock(2)");
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}
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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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pthread_mutex_lock(&mutex);
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printf("1: Thread joined. X was %d. Return value (long) was %ld\n",
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x, (long)joinval);
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assert(x == 20000000);
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return 0;
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}
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void *
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threadfunc(void *arg)
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{
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long count = *(int *)arg;
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int ret;
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printf("2: Second thread (%p). Count is %ld\n", pthread_self(), count);
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while (count--) {
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ret = pthread_mutex_lock(&mutex);
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if (ret != 0)
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err(1, "pthread_mutex_lock(3)");
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x++;
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ret = pthread_mutex_unlock(&mutex);
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if (ret != 0)
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err(1, "pthread_mutex_unlock(3)");
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}
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return (void *)count;
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}
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