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#define _GNU_SOURCE
#include <pthread.h>
#include <assert.h>
#include <unistd.h>
#include <error.h>
#include <errno.h>
#include <stdio.h>
#define THREADS 500
void *
foo (void *arg)
{
pthread_mutex_t *mutex = arg;
pthread_mutex_lock (mutex);
pthread_mutex_unlock (mutex);
return mutex;
}
int
main (int argc, char **argv)
{
int i;
error_t err;
pthread_t tid[THREADS];
pthread_mutex_t mutex[THREADS];
for (i = 0; i < THREADS; i ++)
{
pthread_mutex_init (&mutex[i], 0);
pthread_mutex_lock (&mutex[i]);
err = pthread_create (&tid[i], 0, foo, &mutex[i]);
if (err)
error (1, err, "pthread_create");
sched_yield ();
}
for (i = THREADS - 1; i >= 0; i --)
{
void *ret;
pthread_mutex_unlock (&mutex[i]);
err = pthread_join (tid[i], &ret);
if (err)
error (1, err, "pthread_join");
assert (ret == &mutex[i]);
}
return 0;
}
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