On Wed, Feb 3, 2010 at 9:42 PM, Ralf W. Grosse-Kunstleve <r...@yahoo.com>wrote:
> It would be a nice feature to have, but in 8+ years working with > Boost.Python I never truly needed it. > > I figure if your extension runs a long time it must have some layers of > loops. If you can modify the > extension code, I'd reorganize it to move the outer loop into Python. If > the extension is a function, > I'd turn it into a class like this: > > calc = calculation() > while (calc.is_not_finished()): > calc.inner_loop() > > If you figure out how to make Ctrl-C work portably (!), post it here! > I wouldn't advise this solution exactly like this. It may work, but is going to be slow. Moving loops into Python makes the computation probably a lot slower. The solution I adopted for the NS-3 simulator (ns3.Simulator.Run()) was kind of hybrid. There is an outer loop, and there is an API to run a single iteration of that loop. The ns3.Simulator.Run() wrapper[1] runs iterations of the loop the following way: we run iterations while there are events to process; every 100 iterations we 1) acquire the GIL, 2) call PyErr_CheckSignals() and check the result of PyErr_Occurred(), 3) release the GIL again. [1] See _wrap_Simulator_Run in http://code.nsnam.org/ns-3-dev/file/0ca25e25b116/bindings/python/ns3module_helpers.cc > Ralf > > > ----- Original Message ---- > From: Amos Anderson <nitroa...@gmail.com> > To: Development of Python/C++ integration <cplusplus-sig@python.org> > Sent: Wed, February 3, 2010 12:24:13 PM > Subject: [C++-sig] how do i interrupt a C++ extension? > > Hello -- > > I've got a python script with C++ extensions. Some of my extensions > take a long time to complete, and I don't want to wait for them to > finish when I'm debugging stuff. However, when I do Ctrl-C in my > terminal, it's completely ignored. So it looks like python is trapping > the signal, but apparently can't do anything with it until the > extension returns control to the python script. I guess ideally, > Ctrl-C would kill the extension and return control to python, > generating an exception, but I'd also be ok if Ctrl-C killed the > python script too. > > I've been googling around, but can't figure out how this seemingly > simple (and desired) task is accomplished. Anybody know how to do it? > Right now, the only solution is Ctrl-Z and kill %1 so I guess that > works for now... > > thanks! > > Amos. > _______________________________________________ > Cplusplus-sig mailing list > Cplusplus-sig@python.org > http://mail.python.org/mailman/listinfo/cplusplus-sig > > _______________________________________________ > Cplusplus-sig mailing list > Cplusplus-sig@python.org > http://mail.python.org/mailman/listinfo/cplusplus-sig > -- Gustavo J. A. M. Carneiro INESC Porto, Telecommunications and Multimedia Unit "The universe is always one step beyond logic." -- Frank Herbert
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