On Tuesday 10 March 2009 19:40:48 McKay Davis wrote: > On Tue, Mar 10, 2009 at 11:08 AM, Phil Thompson > > <p...@riverbankcomputing.com> wrote: > > On Tue, 10 Mar 2009 10:30:04 -1000, McKay Davis <mckay....@gmail.com> > > > > wrote: > >> After no response, maybe more specifics with our Multi-Threaded Python > >> w/ PyQt problem would help: > >> > >> In the main thread, we do: > >> > >> PyEval_InitThreads(); // acquires the lock > >> PyInitialize(); > >> // other init stuff > >> PyThread_release_lock() > >> > >> …and in each new Python thread we do: > >> Py_NewInterpreter() > >> … > >> PyThreads_release_lock() > >> > >> We call release()/acquire() blocks whenever the python script does a > >> blocking operation. A specific example of a lockup with PyQT is > >> running examples/tutorial/t8.pyw. We basically: > >> > >> PyThreads_acquire_lock() > >> <run example script> > >> PyThreads_release_lock() > >> > >> When a slot is invoked as a result of the slider being moved we get a > >> deadlock. This happens when sip_ProtectVirt_languageChange calls > >> PyThreads_release_lock() on an already released lock. If we don’t > >> release the lock after the main thread PyQT script code runs, then the > >> script runs fine – but our other python script threads will be starved > >> out. > >> > >> Anybody have any ideas on how to resolve this deadlock? > > > > PyQt uses the PyGILState_* functions. These aren't supported with > > multiple interpreters - see the docs for Py_NewInterpreter(). > > So its not possible to run PyQt with multiple python interpreters? > > This is too bad, because we require the ability to allow users to > script our application using Python. But, we would also like to > internally use PyQt for GUI development. If we only have one > interpreter then we cannot use PyQt because we cannot allow end-users > the ability to potentially develop PyQt under the commercial license.
Why not use multiprocessing and some sort of message passing via queues? Of course maybe I am not understanding what you are trying to do :-) > Is there a way to allow only our program to access PyQt and end-users > access to the python interpreter too? > > -McKay > > _______________________________________________ > PyQt mailing list PyQt@riverbankcomputing.com > http://www.riverbankcomputing.com/mailman/listinfo/pyqt _______________________________________________ PyQt mailing list PyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
