Specifications

Operating System Routines
IOC$REQXBIMAP
If XBI+ map registers have been permanently allocated to the controller,
IOC$REQXBIMAP returns a success status indicator (SS$_NORMAL) without
allocating the requested map registers. Otherwise, the routine searches for the
required number of map registers, returning SS$_NORMAL when they are found.
If there are not enough contiguous XBI+ map registers available, the routine
places the process fork block onto the XBI+ map register wait queue (ADP$L_
MPRQFL) to wait until enough map registers are available.
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