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

--- PyGate Linux v1.5.13
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

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.

--- PyGate Linux v1.5.13
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

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

--- PyGate Linux v1.5.13
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)