int main ( void )
{
int r;
pthread_t my_rescuer, grabber;
r= pthread_mutex_init(&mx[0], NULL);
assert(!r);
r= pthread_mutex_init(&mx[1], NULL);
assert(!r);
r= pthread_mutex_init(&mx[2], NULL);
assert(!r);
r= pthread_mutex_init(&mx[3], NULL);
assert(!r);
r= pthread_cond_init(&cv, NULL);
assert(!r);
r= pthread_rwlock_init(&rwl, NULL);
assert(!r);
quit_now = my_sem_init( "quit_now", 0,0 );
assert(quit_now);
r= pthread_create( &grabber, NULL, grab_the_lock, NULL );
assert(!r);
sleep(1); /* let the grabber get there first */
r= pthread_create( &my_rescuer, NULL, rescue_me, NULL );
assert(!r);
/* Do stupid things and hope that rescue_me gets us out of
trouble */
/* mx is bogus */
r= pthread_cond_wait(&cv, (pthread_mutex_t*)(1 + (char*)&mx[0]) );
/* mx is not locked */
r= pthread_cond_wait(&cv, &mx[0]);
/* wrong flavour of lock */
r= pthread_cond_wait(&cv, (pthread_mutex_t*)&rwl );
/* mx is held by someone else. */
r= pthread_cond_wait(&cv, &mx[2] );
r= my_sem_post( quit_now );
assert(!r);
r= my_sem_post( quit_now );
assert(!r);
r= pthread_join( my_rescuer, NULL );
assert(!r);
r= pthread_join( grabber, NULL );
assert(!r);
r= my_sem_destroy( quit_now );
assert(!r);
return 0;
}
int main ( void )
{
int r, i;
sem_t* sem;
pthread_t child[N_THREADS];
sem= my_sem_init("sem1", 0, N_THREADS); assert(sem);
for (i = 0; i < N_THREADS; i++) {
r= pthread_create( &child[i], NULL, child_fn, sem );
assert(!r);
}
for (i = 0; i < N_THREADS; i++) {
r= pthread_join( child[i], NULL );
assert(!r);
}
r= my_sem_destroy(sem); assert(!r);
return 0;
}