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SEM_DESTROY(3) |
Library Functions Manual |
SEM_DESTROY(3) |
NAME
sem_destroy — destroy an unnamed semaphore
LIBRARY
POSIX Real-time Library (librt, -lrt)
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().
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
sem_destroy() will fail if:
-
[EBUSY]
-
There are currently threads blocked on the semaphore that sem points to.
-
[EINVAL]
-
sem points to an invalid semaphore.
STANDARDS
sem_destroy() 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.
