SEM_DESTROY

Section: Linux Programmer's Manual (3)
Updated: 2006-03-25
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NAME

sem_destroy - destroy an unnamed semaphore  

SYNOPSIS

#include <semaphore.h>

int sem_destroy(sem_t *sem);
 

DESCRIPTION

sem_destroy() destroys the unnamed semaphore at the address pointed to by sem.

Only a semaphore that has been initialised by sem_init(3) should be destroyed using sem_destroy().

Destroying a semaphore that other processes or threads are currently blocked on (in sem_wait(3)) produces undefined behaviour.

Using a semaphore that has been destroyed produces undefined results, until the semaphore has been reinitialised using sem_init(3).  

RETURN VALUE

sem_destroy() returns 0 on success; on error, -1 is returned, and errno is set to indicate the error.  

ERRORS

EINVAL
sem is not a valid semaphore.
 

CONFORMING TO

POSIX.1-2001.  

NOTES

An unnamed semaphore should be destroyed with sem_destroy() before the memory in which it is located is deallocated. Failure to do this can result in resource leaks on some implementations.  

SEE ALSO

sem_init(3), sem_post(3), sem_wait(3), sem_overview(7)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
NOTES
SEE ALSO

linux.jgfs.net manual pages