PThread Semaphores

#include <pthread.h>

int pthread_mutex_init(pthread_mutex_t *name,

const pthread_mutexattr_t *attr);

int pthread_mutex_destroy(pthread_mutex_t *name);

int pthread_mutex_lock(pthread_mutex_t *name);

int pthread_mutex_trylock(pthread_mutex_t *name);

int pthread_mutex_unlock(pthread_mutex_t *name);

• pthread semaphores are easier to use than semget() and semop()

• all mutexes must be global

• only the thread that locks a mutex can unlock it

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