sem_destroy - Online Linux Manual PageSection : 3
Updated : 2022-12-15
Source : Linux man-pages 6.03

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NAMEsem_destroy − destroy an unnamed semaphore

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LIBRARYPOSIX threads library (libpthread, −lpthread)

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SYNOPSIS#include <semaphore.h>int sem_destroy(sem_t *sem);

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DESCRIPTIONsem_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).

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RETURN VALUEsem_destroy() returns 0 on success; on error, −1 is returned, and errno is set to indicate the error.

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ERRORSEINVAL  sem is not a valid semaphore.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue sem_destroy() Thread safetyMT-Safe

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

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NOTESAn 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.

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SEE ALSOsem_init(3), sem_post(3), sem_wait(3), sem_overview(7) 0

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