HELPLIB.HLB  —  CRTL  sem_destroy, Description
    The sem_destroy function destroys an unnamed semaphore indicated
    by sem. Only a semaphore created using sem_init may be destroyed
    using sem_destroy.

    The potential for deadlock exists if a process calls sem_destroy
    for a semaphore while there is a pending sem_wait, because a
    process may be waiting for a poster that has not yet opened the
    semaphore.
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