[Info-vax] DCL "READ/TIME_OUT=n" from terminal; timer resets if message written to screen

[Dave Froble]

On 5/24/2021 11:31 AM, David Jones wrote:
> On Monday, May 24, 2021 at 10:04:49 AM UTC-4, Dave Froble wrote:
>> There is the speculation that the timer AST was queued to allow time for
>> user entry. That might not always be the case. Likely on a read from
>> terminal in DCL.
>>
>> My "normal" usage of timer ASTs is that I want to allow some time for
>> something to happen, and if it doesn't, move on. No speculation on
>> anything, just stop waiting and move on.
>> --
>
> I imagine read/time_out=... is using the timeout feature of the terminal driver
> and not timer ASTs. The timeout is a feature of the wait for interrupt function
> in the kernel, which is why it resets for every character entered (as well as
> breakthru writes).
>

Thank you David, I was not aware the terminal driver had that timeout 
feature.  That does explain much.

-- 
David Froble                       Tel: 724-529-0450
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