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Manual Pages  — PTHREAD_MUTEX_UNLOCK

NAME

pthread_mutex_unlock – unlock a mutex

CONTENTS

LIBRARY

POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

#include <pthread.h>

int
pthread_mutex_unlock(pthread_mutex_t *mutex);

DESCRIPTION

If the current thread holds the lock on mutex, then the pthread_mutex_unlock() function unlocks mutex.

If the argument pointed by the mutex is a robust mutex in the inconsistent state, and the call to pthread_mutex_consistent() function was not done prior to unlocking, further locking attempts on the mutex mutex are denied and locking functions return ENOTRECOVERABLE error.

RETURN VALUES

If successful, pthread_mutex_unlock() will return zero, otherwise an error number will be returned to indicate the error.

ERRORS

The pthread_mutex_unlock() function will fail if:
[EINVAL]
  The value specified by mutex is invalid.
[EPERM]
  The current thread does not hold a lock on mutex.

SEE ALSO

pthread_mutex_destroy(3), pthread_mutex_init(3), pthread_mutex_lock(3), pthread_mutex_trylock(3)

STANDARDS

The pthread_mutex_unlock() function conforms to IEEE Std 1003.1-96 ("POSIX.1").

PTHREAD_MUTEX_UNLOCK (3) April 29, 2016

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C isn't that hard: void (*(*f[])())() defines f as an array of unspecified size, of pointers to functions that return pointers to functions that return void