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Code Issues Releases Activity

Fixed the EventHook() code so that it also works on Windows, sort of.

Browse Source 
(The "sort of" is because it uses kbhit() to detect that the user
starts typing, and then no events are processed until they hit
return.)

Also fixed a nasty locking bug: EventHook() is called without the Tcl
lock set, so it can't use the ENTER_PYTHON and LEAVE_PYTHON macros,
which manipulate both the Python and the Tcl lock.  I now only acquire
and release the Python lock.

(Haven't tested this on Unix yet...)
This commit is contained in:
Guido van Rossum 1998-06-13 13:56:28 +00:00
parent d458faadc3
commit ad4db17552
1 changed files with 26 additions and 6 deletions
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32
Modules/_tkinter.c
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@ -121,6 +121,11 @@ PERFORMANCE OF THIS SOFTWARE.
#endif /* HAVE_CREATEFILEHANDLER */
#ifdef MS_WINDOWS
#include <conio.h>
#define WAIT_FOR_STDIN
#endif
#ifdef WITH_THREAD
/* The threading situation is complicated. Tcl is not thread-safe, except for
@ -1822,6 +1827,7 @@ static PyMethodDef moduleMethods[] =
static int stdin_ready = 0;
#ifndef MS_WINDOWS
static void
MyFileProc(clientData, mask)
void *clientData;
@ -1829,22 +1835,34 @@ MyFileProc(clientData, mask)
{
stdin_ready = 1;
}
#endif
static PyThreadState *event_tstate = NULL;
static int
EventHook()
{
#ifndef MS_WINDOWS
FHANDLE tfile;
ENTER_PYTHON(event_tstate)
tfile = MAKEFHANDLE(fileno(stdin));
#endif
if (PyThreadState_Swap(NULL) != NULL)
Py_FatalError("EventHook with non-NULL tstate\n");
PyEval_RestoreThread(event_tstate);
stdin_ready = 0;
errorInCmd = 0;
#ifndef MS_WINDOWS
tfile = MAKEFHANDLE(fileno(stdin));
Tcl_CreateFileHandler(tfile, TCL_READABLE, MyFileProc, NULL);
#endif
while (!errorInCmd && !stdin_ready) {
int result;
#ifdef WITH_THREAD
#ifdef MS_WINDOWS
if (_kbhit()) {
stdin_ready = 1;
break;
}
#endif
#if defined(WITH_THREAD) || defined(MS_WINDOWS)
ENTER_TCL
result = Tcl_DoOneEvent(TCL_DONT_WAIT);
release_lock(tcl_lock);
@ -1858,14 +1876,16 @@ EventHook()
if (result < 0)
break;
}
#ifndef MS_WINDOWS
Tcl_DeleteFileHandler(tfile);
#endif
if (errorInCmd) {
errorInCmd = 0;
PyErr_Restore(excInCmd, valInCmd, trbInCmd);
excInCmd = valInCmd = trbInCmd = NULL;
PyErr_Print();
}
LEAVE_PYTHON
PyEval_SaveThread();
return 0;
}