Section: POSIX Programmer's Manual (3P)
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.
--- destroy an unnamed semaphore
int sem_destroy(sem_t *sem);
function shall destroy the unnamed semaphore indicated by
Only a semaphore that was created using
may be destroyed using
the effect of calling
with a named semaphore is undefined. The effect of subsequent use of
is undefined until
is reinitialized by another call to
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
set to indicate the error.
function may fail if:
argument is not a valid semaphore.
There are currently processes blocked on the semaphore.
The following sections are informative.
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
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