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/* Test pthread_rwlock_timedrdlock and pthread_rwlock_timedwrlock. */
#define _GNU_SOURCE
#include <pthread.h>
#include <stdio.h>
#include <assert.h>
#include <error.h>
#include <errno.h>
#include <sys/time.h>
#define THREADS 10
pthread_rwlock_t rwlock;
void *
test (void *arg)
{
error_t err;
int foo = (int) arg;
struct timespec ts;
struct timeval before, after;
int diff;
gettimeofday (&before, 0);
ts.tv_sec = before.tv_sec + 1;
ts.tv_nsec = before.tv_usec * 1000;
printf ("Thread %d starting wait @ %d\n", pthread_self (),
(int) before.tv_sec);
if (foo % 2 == 0)
err = pthread_rwlock_timedrdlock (&rwlock, &ts);
else
err = pthread_rwlock_timedwrlock (&rwlock, &ts);
assert (err == ETIMEDOUT);
gettimeofday (&after, 0);
printf ("Thread %d ending wait @ %d\n", pthread_self (),
(int) after.tv_sec);
diff = after.tv_sec * 1000000 + after.tv_usec
- before.tv_sec * 1000000 - before.tv_usec;
if (diff < 900000 || diff > 1100000)
error (1, EGRATUITOUS, "pthread_mutex_timedlock waited %d us", diff);
return 0;
}
int
main (int argc, char **argv)
{
error_t err;
int i;
pthread_t tid[THREADS];
err = pthread_rwlock_init (&rwlock, 0);
if (err)
error (1, err, "pthread_rwlock_init");
/* Lock it so all the threads will block. */
err = pthread_rwlock_wrlock (&rwlock);
assert (err == 0);
for (i = 0; i < THREADS; i ++)
{
err = pthread_create (&tid[i], 0, test, (void *) i);
if (err)
error (1, err, "pthread_create");
}
for (i = 0; i < THREADS; i ++)
{
void *ret;
err = pthread_join (tid[i], &ret);
if (err)
error (1, err, "pthread_join");
assert (ret == 0);
}
return 0;
}
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