New submission from STINNER Victor <victor.stin...@haypocalc.com>: I'm working on signals, especially on pthread_sigmask(), and I'm trying to understand test_signal failures.
test_signal fails if the _tkinter module is loaded, because _tkinter loads the Tcl library which create a thread waiting events in select(). For example, "python -m test test_pydoc test_signal" fails, because test_pydoc loads ALL Python modules. I opened an issue for test_pydoc: http://bugs.python.org/issue11995 _tkinter.c contains the following code: #if 0 /* This was not a good idea; through <Destroy> bindings, Tcl_Finalize() may invoke Python code but at that point the interpreter and thread state have already been destroyed! */ Py_AtExit(Tcl_Finalize); #endif Tcl_Finalize() exits the thread, but this function is never called in Python. Anyway, it is not possible to unload a module implemented in C. I would like to know if it would be possible to mask all signals in the Tcl thread, or if Tcl supports/uses signals. It is possible to mask all signals in the Tcl thread using: ---------- allsignals = range(1, signal.NSIG) oldmask = signal.pthread_sigmask(signal.SIG_BLOCK, allsignals) import _tkinter signal.pthread_sigmask(signal.SIG_SETMASK, oldmask) ---------- I'm not asking the question for test_signal: I have a patch fixing test_signal, even if the Tcl zombi thread is present (use pthread_kill() to send the signal directly to the main thread). (I wrote "zombi" thread because I was not aware that Tcl uses a thread, nor that test_pydoc loads all modules. The thread is valid, alive, and it's just a joke. The threads is more hidden than zombi.) (Message copied/pasted from python-dev) ---------- components: Tests, Tkinter messages: 135109 nosy: haypo priority: normal severity: normal status: open title: test_signal cannot test blocked signals if _tkinter is loaded versions: Python 3.3 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue11998> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
