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/*
* mutex4.c
*
* Thread A locks mutex - thread B tries to unlock.
*
* Depends on API functions:
* pthread_mutex_lock()
* pthread_mutex_trylock()
* pthread_mutex_unlock()
*/
#include "test.h"
static int wasHere = 0;
static pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
void * locker(void * arg)
{
wasHere++;
assert(pthread_mutex_lock(&mutex1) == 0);
Sleep(1000);
assert(pthread_mutex_unlock(&mutex1) == 0);
wasHere++;
return 0;
}
void * unlocker(void * arg)
{
wasHere++;
/* Wait for locker to lock mutex1 */
Sleep(500);
assert(pthread_mutex_unlock(&mutex1) == EPERM);
wasHere++;
return 0;
}
int
main()
{
pthread_t t;
assert(pthread_create(&t, NULL, locker, NULL) == 0);
assert(pthread_create(&t, NULL, unlocker, NULL) == 0);
Sleep(2000);
assert(wasHere == 4);
return 0;
}
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