44 lines
680 B
C
44 lines
680 B
C
/*
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* mutex3.c
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*
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* Declare a static mutex object, lock it, trylock it,
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* and then unlock it again.
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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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pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
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static int washere = 0;
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void * func(void * arg)
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{
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assert(pthread_mutex_trylock(&mutex1) == EBUSY);
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washere = 1;
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return 0;
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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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assert(pthread_mutex_lock(&mutex1) == 0);
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assert(pthread_create(&t, NULL, func, NULL) == 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(washere == 1);
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return 0;
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}
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