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Watchdog and closing application child tasks

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  Watchdog and closing application child tasks Paul Stewart <phorefaux@gmail.com> - 2026-03-15 01:07 +0000
    Re: Watchdog and closing application child tasks Martin <News04@avisoft.f9.co.uk> - 2026-03-15 07:59 +0000
      Re: Watchdog and closing application child tasks Paul Stewart <phorefaux@gmail.com> - 2026-03-15 16:36 +0000

#6619 — Watchdog and closing application child tasks

Hi all,

Does the system watchdog broadcast a specific message to terminate an 
application?

The reason for asking is I have an application written in BASIC that 
spawns a couple of child tasks.  As part of the close down routine it does 
close down any open child tasks.  This appears to be working fine.  If I 
quit the program whilst child task is running, then the open child task 
quits, as expected, same as if I quit my application from Task 
display/Task manager.

However when the task is closed via system watchdog(Alt-Break), the main 
task is closed, but not any open child tasks.  I am therefore wondering if 
there is a specific message I need to listen out for so I can close the 
child tasks too?

-- 
Paul Stewart
Sent from A9home running RISC OS 4.42

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#6620

In article <20deb3b95c.Paul@phorefaux>,
   Paul Stewart <phorefaux@gmail.com> wrote:

> Does the system watchdog broadcast a specific message to terminate
> an application?

> The reason for asking is I have an application written in BASIC
> that spawns a couple of child tasks.  As part of the close down
> routine it does close down any open child tasks.  This appears to
> be working fine.  If I quit the program whilst child task is
> running, then the open child task quits, as expected, same as if I
> quit my application from Task display/Task manager.

> However when the task is closed via system watchdog(Alt-Break), the
> main task is closed, but not any open child tasks.  I am therefore
> wondering if there is a specific message I need to listen out for
> so I can close the child tasks too?

The Watchdog terminates a task immediately. The task has no control at
all, so gets no chance to take any action whatsoever. Any open files
will be left open. Such termination really should be a last resort to
regain control of the machine, but the task is toast.

-- 
Martin Avison 
Note that unfortunately this email address will become invalid
without notice if (when) any spam is received. 

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#6621

In message <5cb9d9a3afNews04@avisoft.f9.co.uk>
          Martin <News04@avisoft.f9.co.uk> wrote:

> In article <20deb3b95c.Paul@phorefaux>,
>    Paul Stewart <phorefaux@gmail.com> wrote:

>> Does the system watchdog broadcast a specific message to terminate
>> an application?

>> The reason for asking is I have an application written in BASIC
>> that spawns a couple of child tasks.  As part of the close down
>> routine it does close down any open child tasks.  This appears to
>> be working fine.  If I quit the program whilst child task is
>> running, then the open child task quits, as expected, same as if I
>> quit my application from Task display/Task manager.

>> However when the task is closed via system watchdog(Alt-Break), the
>> main task is closed, but not any open child tasks.  I am therefore
>> wondering if there is a specific message I need to listen out for
>> so I can close the child tasks too?

> The Watchdog terminates a task immediately. The task has no control at
> all, so gets no chance to take any action whatsoever. Any open files
> will be left open. Such termination really should be a last resort to
> regain control of the machine, but the task is toast.

Thanks for your prompt response.

Ok.  Thought as much, but just wanted to double check I wasn't missing a 
message that I could use to close my child tasks down with.


-- 
Paul Stewart
Sent from A9home running RISC OS 4.42

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