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  2. MIDRANGE-L
  3. January 1998

data queues

The API Retrieve Data Queue Message (QMHRDQM) has been available since
V2R3.  This API provides for retrieving a message without removing the
message and is available on both CISC and RISC.  The API is documented
in the System API Reference.

Bruce Vining

>
>Under the CISC OS, when an entry is received from the queue it was
>automatically
>removed from the queue.  If you need the entry again for another process it
>could
>be added back to the queue but that practice could cause some serious cycle
>stealing looping.  I thought I heard mention that the RISC OS versions has a
>function to retain the entry, don't know for sure.
>
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