NetNews Usenet Archive 1992 #16/NN_1992_16.iso/spool/comp/lang/ada/2175

Text File | 1992-07-22 | 1.7 KB | 40 lines

Newsgroups: comp.lang.ada
Path: sparky!uunet!europa.asd.contel.com!king
From: [e-mail] (Larry King)
Subject: Ada tasking rules and AST's...
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Date: Wed, 22 Jul 1992 19:41:30 GMT
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Hello again everyone,

    First I would like to thank all those that replied to my last
posting on Unix system calls in Ada.  The powers to be did not deem it
necessary to provide me with the Sun Ada Programmers Guide.  Now that I
have it and the replies from various people the Unix problem is behind
me... Now I have the following...

    We are issueing VMS system calls from Ada.  These system calls
have associated AST's which I have defined and have gotten to work
correctly.  My question is how can I get Ada to do a rescheduling of the
tasks to get this new entry to run.  There is one process that takes
some amount of time but if the system call has finished we would like
the AST entry to run before this task normally finishes.  Currently we
issue a delay statement for the time
DURATION'SMALL but this causes us to lose 10 milliseconds of time just
to do the delay.  It does cause VAX Ada to run the AST entry but we would like
to avoid losing the 10 milliseconds if possible.  Does VAX Ada (or any
Ada for that matter) allow you to force an execution of the next entry on
the queue before the current task has completely finished?  I know the
question is vague but I hope I am giving enough for someone to give me a
reply.  Thanks in advance...

--
Larry King
GTE Government Systems, Needham, MA            [phone]
E-Mail : [e-mail]