pthread_mutex.h

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struct pthread_mutex {
        volatile int lock;
        void *owner;
        volatile int refcnt;
};

struct pthread_mutexattr {
};

typedef struct pthread_mutex pthread_mutex_t;
typedef struct pthread_mutexattr pthread_mutexattr_t;

#define PTHREAD_MUTEX_INITIALIZER { 0, (void *)NULL }

extern int pthread_mutex_destroy(pthread_mutex_t *mutex);

extern int pthread_mutex_init(pthread_mutex_t *mutex,
                const pthread_mutexattr_t *attr);

extern int pthread_mutex_lock(pthread_mutex_t *mutex);

extern int pthread_mutex_trylock(pthread_mutex_t *mutex);

extern int pthread_mutex_unlock(pthread_mutex_t *mutex);