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From: Ullrich Koethe (u.koethe_at_[hidden])
Date: 2001-06-25 18:36:11
dustin_at_[hidden] wrote:
>
> Thank you for your reply. Here is what I want to accomplish:
>
> 1. A long running C++ method within the extension module monitors a
> flag, and exits if the flag is true.
> 2. A seperate python thread sets the flag when the user hits a cancel
> button.
>
> In order to do this, I will have to release the interpreter lock, so
> that the user interface thread can execute. Can I safely set a
> boolean value within the extension module from the user interface
> thread while the main thread executes within the extension module?
>
The cleanest solution might be this: let the button call
"PyErr_SetInterrupt()" when pressed (of course, the GUI thread must hold
the Python lock to do this). Then, in the other thread (long C++
algorithm) regularly re-aquire the Python lock and call
"PyOS_InterruptOccurred()". Throw an exception if this call returns true
(e.g. throw std::runtime_error("User interrupt")). Note that the C++
algorithm must not invoke either Python or GUI functions while it
doesn't hold the lock.
Ulli
-- ________________________________________________________________ | | | Ullrich Koethe Universität Hamburg / University of Hamburg | | FB Informatik / Dept. of Computer Science | | AB Kognitive Systeme / Cognitive Systems Group | | | | Phone: +49 (0)40 42883-2573 Vogt-Koelln-Str. 30 | | Fax: +49 (0)40 42883-2572 D - 22527 Hamburg | | Email: u.koethe_at_[hidden] Germany | | koethe_at_[hidden] | | WWW: http://kogs-www.informatik.uni-hamburg.de/~koethe/ | |________________________________________________________________|
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