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
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.
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.
semctl(), semget(), semop(),
The Base Definitions volume of POSIX.1‐2017,
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1-2017, Standard for Information Technology -- Portable Operating
System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018
Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html .
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