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SEM_DESTROY

Linux Programmer's Manual (3)
2014-03-03
 

NAME

sem_destroy - destroy an unnamed semaphore  

SYNOPSIS

#include <semaphore.h>

int sem_destroy(sem_t *sem);

Link with -pthread.  

DESCRIPTION

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

Only a semaphore that has been initialized 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 behavior.

Using a semaphore that has been destroyed produces undefined results, until the semaphore has been reinitialized 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.
 

ATTRIBUTES

 

Multithreading (see pthreads(7))

The sem_destroy() function is thread-safe.  

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)  

COLOPHON

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Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
Multithreading (see pthreads(7))
CONFORMING TO
NOTES
SEE ALSO
COLOPHON

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Time: 21:43:02 GMT, July 12, 2014