trusty (3) sem_destroy.3posix.gz

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NAME
       sem_destroy - destroy an unnamed semaphore (REALTIME)


SYNOPSIS
       #include <semaphore.h>

       int sem_destroy(sem_t *sem);


DESCRIPTION
       The  sem_destroy()  function  shall destroy the unnamed semaphore indicated by sem. Only a semaphore that
       was created using sem_init() may be destroyed using sem_destroy(); the effect  of  calling  sem_destroy()
       with a named semaphore is undefined. The effect of subsequent use of the semaphore sem is undefined until
       sem is reinitialized by another call to sem_init().

       It is safe to destroy an initialized semaphore upon which no threads are currently blocked. The effect of
       destroying a semaphore upon which other threads are currently blocked is undefined.


RETURN VALUE
       Upon successful completion, a value of zero shall be returned. Otherwise, a value of -1 shall be returned
       and errno set to indicate the error.


ERRORS
       The sem_destroy() function shall fail if:

       EINVAL The sem argument is not a valid semaphore.

       The sem_destroy() function may fail if:

       EBUSY  There are currently processes blocked on the semaphore.

       The following sections are informative.


EXAMPLES
       None.


APPLICATION USAGE
       The sem_destroy() function  is  part  of  the  Semaphores  option  and  need  not  be  available  on  all
       implementations.


RATIONALE
       None.


FUTURE DIRECTIONS
       None.


SEE ALSO
       semctl()   ,   semget()   ,  semop()  ,  sem_init()  ,  sem_open()  ,  the  Base  Definitions  volume  of
       IEEE Std 1003.1-2001, <semaphore.h>


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers,
       Inc  and  The  Open Group. In the event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard  is  the  referee  document.  The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .