[Info-vax] Returning data from Cobol AST routine.

[Andrew Commons]

I did this many years ago in MACRO32.

The main program set up two queues:

(a) An empty work queue
(b) A buffer queue primed with some arbitrary number of buffers.

The queues were managed using INSQUE/REMQUE.

Main pulls a buffer from the buffer queue, QIOs the mailbox with AST 
routine with queue headers as AST param, then $HIBERs.

On wake it pulls buffer from the work queue and processes it putting the
buffer on the end of the free queue when done. Loop until work is
empty then $HIBER.

The AST routine puts the filled buffer on the end of the work queue,
pulls a buffer from the free queue, QIOs the mailbox, $WAKE,  and returns.

Volume was low so didn't have to worry about running out of buffers

The LIB$ routines give you access to the instructions so this should
be possible in COBOL.