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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;
void * unlocker(void * arg)
{
int expectedResult = (int) arg;
wasHere++;
assert(pthread_mutex_unlock(&mutex1) == expectedResult);
wasHere++;
return NULL;
}
int
main()
{
pthread_t t;
pthread_mutexattr_t ma;
assert(pthread_mutexattr_init(&ma) == 0);
wasHere = 0;
assert(pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_DEFAULT) == 0);
assert(pthread_mutex_init(&mutex1, &ma) == 0);
assert(pthread_mutex_lock(&mutex1) == 0);
assert(pthread_create(&t, NULL, unlocker, (void *) 0) == 0);
assert(pthread_join(t, NULL) == 0);
assert(pthread_mutex_unlock(&mutex1) == EPERM);
assert(wasHere == 2);
wasHere = 0;
assert(pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_NORMAL) == 0);
assert(pthread_mutex_init(&mutex1, &ma) == 0);
assert(pthread_mutex_lock(&mutex1) == 0);
assert(pthread_create(&t, NULL, unlocker, (void *) 0) == 0);
assert(pthread_join(t, NULL) == 0);
assert(pthread_mutex_unlock(&mutex1) == EPERM);
assert(wasHere == 2);
wasHere = 0;
assert(pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_ERRORCHECK) == 0);
assert(pthread_mutex_init(&mutex1, &ma) == 0);
assert(pthread_mutex_lock(&mutex1) == 0);
assert(pthread_create(&t, NULL, unlocker, (void *) EPERM) == 0);
assert(pthread_join(t, NULL) == 0);
assert(pthread_mutex_unlock(&mutex1) == 0);
assert(wasHere == 2);
wasHere = 0;
assert(pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_RECURSIVE) == 0);
assert(pthread_mutex_init(&mutex1, &ma) == 0);
assert(pthread_mutex_lock(&mutex1) == 0);
assert(pthread_create(&t, NULL, unlocker, (void *) EPERM) == 0);
assert(pthread_join(t, NULL) == 0);
assert(pthread_mutex_unlock(&mutex1) == 0);
assert(wasHere == 2);
return 0;
}
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