68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
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/*
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* mutex4.c
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*
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* Thread A locks mutex - thread B tries to unlock.
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*
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* Depends on API functions:
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* pthread_mutex_lock()
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* pthread_mutex_trylock()
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* pthread_mutex_unlock()
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*/
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#include "test.h"
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static int wasHere = 0;
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static pthread_mutex_t mutex1;
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void * unlocker(void * arg)
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{
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int expectedResult = (int) arg;
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wasHere++;
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assert(pthread_mutex_unlock(&mutex1) == expectedResult);
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wasHere++;
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return NULL;
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}
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int
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main()
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{
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pthread_t t;
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pthread_mutexattr_t ma;
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assert(pthread_mutexattr_init(&ma) == 0);
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wasHere = 0;
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assert(pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_DEFAULT) == 0);
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assert(pthread_mutex_init(&mutex1, &ma) == 0);
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assert(pthread_mutex_lock(&mutex1) == 0);
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assert(pthread_create(&t, NULL, unlocker, (void *) EPERM) == 0);
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assert(pthread_join(t, NULL) == 0);
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assert(pthread_mutex_unlock(&mutex1) == 0);
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assert(pthread_mutex_destroy(&mutex1) == 0);
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assert(wasHere == 2);
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wasHere = 0;
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assert(pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_ERRORCHECK) == 0);
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assert(pthread_mutex_init(&mutex1, &ma) == 0);
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assert(pthread_mutex_lock(&mutex1) == 0);
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assert(pthread_create(&t, NULL, unlocker, (void *) EPERM) == 0);
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assert(pthread_join(t, NULL) == 0);
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assert(pthread_mutex_unlock(&mutex1) == 0);
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assert(pthread_mutex_destroy(&mutex1) == 0);
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assert(wasHere == 2);
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wasHere = 0;
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assert(pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_RECURSIVE) == 0);
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assert(pthread_mutex_init(&mutex1, &ma) == 0);
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assert(pthread_mutex_lock(&mutex1) == 0);
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assert(pthread_create(&t, NULL, unlocker, (void *) EPERM) == 0);
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assert(pthread_join(t, NULL) == 0);
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assert(pthread_mutex_unlock(&mutex1) == 0);
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assert(pthread_mutex_destroy(&mutex1) == 0);
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assert(wasHere == 2);
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return 0;
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}
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