NAME
sem_destroy —
destroy an unnamed semaphore
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
sem_destroy() will fail if:
- [
EINVAL] - sem points to an invalid semaphore.
- [
EBUSY] - There are currently threads blocked on the semaphore that sem points to.
SEE ALSO
sem_getvalue(3), sem_init(3), sem_open(3), sem_post(3), sem_wait(3)
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.