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From: nagy%bsndbg.hepnet@LBL.ARPA.UUCP
Newsgroups: mod.computers.vax
Subject: Sch$QAST
Message-ID: <8702271700.AA20360@ucbvax.Berkeley.EDU>
Date: Fri, 27-Feb-87 10:10:03 EST
Article-I.D.: ucbvax.8702271700.AA20360
Posted: Fri Feb 27 10:10:03 1987
Date-Received: Sun, 1-Mar-87 09:32:15 EST
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Approved: info-vax@sri-kl.arpa

SCH$QAST is an executive routine used to queue an AST Control Block (ACB)
to a process.  The calling sequence is:

	MOVL	#priority-increment-class,R2
	MOVAB	acb,R5
	JSB	G^SCH$QAST

from user-written system services.  This routine is documented where
all good executive routines are documented - in the microfiche.

I have used this routine in several user-written system services with
no problems.  The latest one, DXPAST for Declare eXternal Process AST,
extends the SYS$DCLAST service to allow one process to specify an AST
in another process.  In this case, the priority increment class was
set to 0.  In fact, the place to learn about SCH$QAST in the microfiche
is the SYS$DCLAST routine.  The other place, where the routine is
defined, is the AST Delivery module.

Good luck.