SEM_DESTROY(3) |
FreeBSD Library Functions Manual |
SEM_DESTROY(3) |
NAME
sem_destroy —
destroy an unnamed semaphore
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include < semaphore.h>
int
sem_destroy( sem_t *sem);
DESCRIPTION
The
sem_destroy() function destroys the unnamed semaphore pointed to by
sem. After a successful call to
sem_destroy(),
sem is unusable until re-initialized by another call to
sem_init(3).
RETURN VALUES
The
sem_destroy() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable
errno is set to indicate the error.
ERRORS
The
sem_destroy() function will fail if:
-
[
EINVAL]
-
The
sem argument points to an invalid semaphore.
-
[
EBUSY]
-
There are currently threads blocked on the semaphore that
sem points to.
STANDARDS
The
sem_destroy() function conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).
POSIX does not define the behavior of sem_destroy() if called while there are threads blocked on sem, but this implementation is guaranteed to return -1 and set errno to EBUSY if there are threads blocked on sem.