#include <pthread.h>
int pthread_mutex_init(pthread_mutex_t *restrict mutex, const pthread_mutexattr_t *restrict attr);
int pthread_mutex_destroy(pthread_mutex_t *mutex);
pthread_mutex_t lock;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_muteattr_t mattr;
int retval;
pthread_mutex_init (&lock, NULL);
ret = pthread_mutex_init (&lock, &mttr);
pthread_mutex_destroy (&lock);
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