dg_sem_pend(2) — DG/UX R4.11MU05



dg_sem_pend(2)                 DG/UX R4.11MU05                dg_sem_pend(2)


NAME
       dgsempend - pend on a binary semaphore

SYNOPSIS
       int  dgsempend (int semid)

   where:
       semid    The id of any binary semaphore in the set that was
                 previously allocated by the calling process

DESCRIPTION
       The dgsempend system call will pend the calling thread on the
       binary semaphore until it has been posted or the calling thread is
       interrupted by a signal.  The semid can be the identifier of any
       binary semaphore in the set that was previously allocated by the
       process.

       Only one thread in a process can pend a binary semaphore.

ACCESS CONTROL
       On a system with DG/UX information security, appropriate privilege is
       required by having one or more specific capabilities enabled in the
       effective capability set of the user.  See capdefaults for the
       default capabilities for this command.

RETURN VALUE
       0         Completed successfully.

       -1        An error occurred.  errno is set to indicate the error.

DIAGNOSTICS
       Errno may be set to one of the following error codes:

       EINVAL  semid is not allocated to the process.

       EINTR   The thread was interrupted by a signal while waiting for the
               binary semaphore to be posted.

       EACCES  The system supports DG/UX information security and the caller
               does not have appropriate privilege.

SEE ALSO
       dgsemgetid(2), dgsemreleaseid(2), dgsempost(2),
       capdefaults(5).


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