python's threading has no "interrupt"?
joconnor at cybermesa.com
Tue Dec 2 17:59:17 CET 2003
Peter Hansen wrote:
>Jay O'Connor wrote:
>>.... When the background
>>process would wake up, since it was a higher priority, it would
>>immediately take control. It's main job was to check the list of
>>handling processes for any that had been running too long (long running
>>processes in a web server meant that something had gone wrong) and
>>terminate them (freeing up the process and socket resources, etc..).
>Can you describe the nature of the "something had gone wrongs" that
>you were trying to handle? It's a very important point for a design
>like this. Could these processes launch external programs which
>might not exit in time? Were they possibly buggy, encountering for
>example endless loops? Were they dynamically loaded code written by
>others, which could mean malicious behaviour was possible? Or something
>Depending on the answer, it will be either very easy to handle in Python,
>or very hard, or potentially impossible in a straightforward fashion.
The problem is that we didn't know what it could be. We had exception
handlers at lower levels sufficient to handle coding bugs and file i/o
issues. What ususally killed us was a network error that terminated
the connection in mid transaction at some point or even just the user
hitting 'cancel' mid stream
FWIW - the 'cleanup' process running at higher priority also took care
of some bookkeeping, stats collecting, some memory management
(releasing cached objects untouched for awhile so they could be GC), etc...
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