Interprocess mutex with pthreads

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The following example demonstrates the creation, use and destruction of a Pthread interprocess mutex. Generalizing the example for multiple processes is left as an exercise for the reader.

#include <pthread.h>

pthread_mutex_t shm_mutex;

int main(void)
{
    int err;
    pthread_mutexattr_t attr;
    err = pthread_mutexattr_init(&attr); if (err) return err;
    err = pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED); if (err) return err;
    err = pthread_mutex_init(&shm_mutex, &attr); if (err) return err;
    err = pthread_mutexattr_destroy(&attr); if (err) return err;
    err = pthread_mutex_lock(&shm_mutex); if (err) return err;
    err = pthread_mutex_unlock(&shm_mutex); if (err) return err;
    err = pthread_mutex_destroy(&shm_mutex); if (err) return err;
    return 0;
}

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