[Info-vax] hung program location

[VAXman- at SendSpamHere.ORG]

In article <kg0ula$cse$1 at dont-email.me>, Stephen Hoffman <seaohveh at hoffmanlabs.invalid> writes:
>On 2013-02-19 22:21:36 +0000, David Froble said:
>
>> Tom Adams wrote:
>> 
>>> There is only one AST programmed in. It's a resource wait AST that
>>> only fires when the system is telling the process to shutdown, so it
>>> did not cause the problem.  None of the QIOs or QIOWs use ASTs.
>> 
>> If you're using QIO, and don't have a completion AST routine, well, I 
>> know nothing, but I've had the impression that a completion AST routine 
>> is rather normal to signal the completion of the QIO.
>
>A completion AST routine is common with sys$qio, yes.  It's not 
>necessary, though.  You can easily code the routine to continue running 
>the mainline code with the I/O outstanding and then — some distance 
>forward in the code, when you need to look in the buffer or such — 
>issue the equivalent of sys$synch.  A simple double-buffering scheme 
>can use a pair of sys$qiow calls and a pair of sys$synch calls in a 
-------------------^^^^^^^^ SYS$QIO?
>loop, for instance.

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