FYI
---------- Forwarded message ----------
From: Igor Stasenko <
[hidden email]>
Date: 2009/5/1
Subject: Re: Improving a Process termination procedure
To: The general-purpose Squeak developers list
<
[hidden email]>
Another improvement would be to marry the process termination with
exception handling,
and nicely signal ProcessTerminatedException.
This offers many practical benefits, since then we could write:
[ ... ] on: ProcessTerminatedException do: [:ex |
"oh man we're been terminated"
].
But i'm not expert in exception handling.
Can someone give me a sample, how to signal such exception in potential
#terminateFromContext: method?
2009/5/1 Igor Stasenko <
[hidden email]>:
> There are a potential of having incorrect behavior , when terminating
> a preempted or waiting process:
>
> with introduction of ProcessLocalVariable, it is essential that
> context unwinding procedure should be performed only
> for currently active process.
>
> Here the proposal how to ensure this:
>
> if terminating process is not active process we should do the following:
>
> suspendedContext := proc suspendedContext.
> currentProces := Processor activeProcess.
> proc suspendedContext: [ Processor activeProcess
> terminateFromContext: suspendedContext. Processor switchToProcess:
> currentProcess ] asContext.
> Processor switchToProcess: proc.
>
> here #switchToProcess: is explicit switch (bypassing scheduling logic).
>
> If we don't care about immediate termination of process and getting
> back to process who initiated termination as soon as possible, then
> simply do:
> process terminateSoon.
>
> which can be implemented as:
>
> Process>>terminateSoon
> | termContext |
> termContext := suspendedContext.
> suspendedContext := [ self terminateFromContext: termContext. self
> suspend ] asContext.
> Processor yield.
>
>
>
> --
> Best regards,
> Igor Stasenko AKA sig.
>
--
Best regards,
Igor Stasenko AKA sig.
--
Best regards,
Igor Stasenko AKA sig.
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