UC3M

Let's see how to initialize a mutex. A mutex can be initialized in two ways. The first is to use the function pthread_mutex_init and the second by a special macro: PTHREAD_MUTEX_INITIALIZER. The initialization function receives a pointer to pthread_mutex_t and a configuration for the mutex (pthread_mutexattr_t). The initialization function returns 0 if it was possible to create the mutex.

#include <pthread.h>
  //returns 0 in sucesses, other values diferent from 0 mean mistake
int pthread_mutex_init(pthread_mutex_t *restrict mutex,const pthread_mutexattr_t *restrict attr);
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;