sem_destroy(3)

1SEM_DESTROY(3)             Linux Programmer's Manual            SEM_DESTROY(3)
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NAME

6       sem_destroy - destroy an unnamed semaphore
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SYNOPSIS

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

14       sem_destroy()  destroys the unnamed semaphore at the address pointed to
15       by sem.
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17       Only a semaphore that has been initialised  by  sem_init(3)  should  be
18       destroyed using sem_destroy().
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20       Destroying  a  semaphore  that other processes or threads are currently
21       blocked on (in sem_wait(3)) produces undefined behaviour.
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23       Using a semaphore that has been destroyed produces  undefined  results,
24       until the semaphore has been reinitialised using sem_init(3).
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RETURN VALUE

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

31       EINVAL sem is not a valid semaphore.
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CONFORMING TO

34       POSIX.1-2001.
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NOTES

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