Originální popis anglicky:
sem_destroy - destroy an unnamed semaphore (
REALTIME)
Návod, kniha: POSIX Programmer's Manual
#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.
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 shall fail if:
- EINVAL
- The sem argument is not a valid semaphore.
The
sem_destroy() function may fail if:
- EBUSY
- There are currently processes blocked on the semaphore.
The following sections are informative.
None.
The
sem_destroy() function is part of the Semaphores option and need not
be available on all implementations.
None.
None.
semctl() ,
semget() ,
semop() ,
sem_init() ,
sem_open() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<semaphore.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 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
.
