VMS Help System Services, $SETRWM  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Allows a process to specify what action system services should
    take when system resources required for their execution are
    unavailable.

                                 CAUTION

       Disabling resource waiting should be performed with caution,
       as doing so can have unexpected effects on constituent
       sharable images and runtime libraries.

    Format

      SYS$SETRWM  [watflg]

    C Prototype

      int sys$setrwm  ( char watflg);

1 - Argument

 watflg

    OpenVMS usage:longword_unsigned
    type:         longword (unsigned)
    access:       read only
    mechanism:    by value
    Indicator specifying whether system services should wait for
    required resources. The watflg argument is a longword value. The
    value 0 (the default) specifies that system services should wait
    until resources needed for their execution become available.
    The value 1 specifies that system services should return failure
    status immediately when resources needed for their execution are
    unavailable.

    The operating system enables resource wait mode for all
    processes. You can disable resource wait mode only by calling
    $SETRWM.

    If resource wait mode is disabled, it remains disabled until it
    is explicitly reenabled or until the process is deleted.