sem_destroy(3) Library Functions Manual sem_destroy(3)

sem_destroy - destroy an unnamed semaphore

POSIX threads library (libpthread, -lpthread)

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

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).

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

sem is not a valid semaphore.

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

Interface Attribute Value
sem_destroy () Thread safety MT-Safe



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.

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

2024-05-02 Linux man-pages 6.8