sem_destroy (3)

Table of Contents

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

For an explanation of the terms used in this section, see attributes(7) .

Interface	Attribute	Value
sem_destroy()	Thread safety	MT-Safe

Conforming to

POSIX.1-2001, POSIX.1-2008.

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

This page is part of release 5.09 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

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Table of Contents

• Name
• Synopsis
• Description
• Return Value
• Errors
• Attributes
• Conforming to
• Notes
• See Also
• Colophon