sem_destroy man page


This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

sem_destroy — destroy an unnamed semaphore


#include <semaphore.h>

int sem_destroy(sem_t *sem);


The sem_destroy() function shall destroy the unnamed semaphore indicated by sem. Only a semaphore that was created using sem_init() may be destroyed using sem_destroy(); the effect of calling sem_destroy() with a named semaphore is undefined. The effect of subsequent use of the semaphore sem is undefined until sem is reinitialized by another call to sem_init().

It is safe to destroy an initialized semaphore upon which no threads are currently blocked. The effect of destroying a semaphore upon which other threads are currently blocked is undefined.

Return Value

Upon successful completion, a value of zero shall be returned. Otherwise, a value of -1 shall be returned and errno set to indicate the error.


The sem_destroy() function may fail if:

The sem argument is not a valid semaphore.
There are currently processes blocked on the semaphore.

The following sections are informative.

See Also

semctl(), semget(), semop(), sem_init(), sem_open()

The Base Definitions volume of POSIX.1‐2008, <semaphore.h>


2013 IEEE/The Open Group POSIX Programmer's Manual