Patch by Jonathan Giddy (with some cleanup by me) to always use the
thread state of the thread calling mainloop() (or another event
handling function) rather than the thread state of the function that
created the client data structure.
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index 54a9aa0..b5be260 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -157,14 +157,14 @@
the thread state) but doesn't release the Tcl lock; LEAVE_OVERLAP_TCL
releases the Tcl lock.
- By contrast, ENTER_PYTHON(tstate) and LEAVE_PYTHON are used in Tcl event
+ By contrast, ENTER_PYTHON and LEAVE_PYTHON are used in Tcl event
handlers when the handler needs to use Python. Such event handlers are
entered while the lock for Tcl is held; the event handler presumably needs
- to use Python. ENTER_PYTHON(tstate) releases the lock for Tcl and acquires
+ to use Python. ENTER_PYTHON releases the lock for Tcl and acquires
the Python interpreter lock, restoring the appropriate thread state, and
LEAVE_PYTHON releases the Python interpreter lock and re-acquires the lock
for Tcl. It is okay for ENTER_TCL/LEAVE_TCL pairs to be contained inside
- the code between ENTER_PYTHON(tstate) and LEAVE_PYTHON.
+ the code between ENTER_PYTHON and LEAVE_PYTHON.
These locks expand to several statements and brackets; they should not be
used in branches of if statements and the like.
@@ -172,24 +172,28 @@
*/
static type_lock tcl_lock = 0;
+static PyThreadState *tcl_tstate = NULL;
#define ENTER_TCL \
- Py_BEGIN_ALLOW_THREADS acquire_lock(tcl_lock, 1);
+ { PyThreadState *tstate = PyThreadState_Get(); Py_BEGIN_ALLOW_THREADS \
+ acquire_lock(tcl_lock, 1); tcl_tstate = tstate;
#define LEAVE_TCL \
- release_lock(tcl_lock); Py_END_ALLOW_THREADS
+ tcl_tstate = NULL; release_lock(tcl_lock); Py_END_ALLOW_THREADS}
#define ENTER_OVERLAP \
Py_END_ALLOW_THREADS
#define LEAVE_OVERLAP_TCL \
- release_lock(tcl_lock);
+ tcl_tstate = NULL; release_lock(tcl_lock); }
-#define ENTER_PYTHON(tstate) \
- release_lock(tcl_lock); PyEval_RestoreThread((tstate));
+#define ENTER_PYTHON \
+ { PyThreadState *tstate = tcl_tstate; tcl_tstate = NULL; \
+ release_lock(tcl_lock); PyEval_RestoreThread((tstate)); }
#define LEAVE_PYTHON \
- PyEval_SaveThread(); acquire_lock(tcl_lock, 1);
+ { PyThreadState *tstate = PyEval_SaveThread(); \
+ acquire_lock(tcl_lock, 1); tcl_tstate = tstate; }
#else
@@ -197,7 +201,7 @@
#define LEAVE_TCL
#define ENTER_OVERLAP
#define LEAVE_OVERLAP_TCL
-#define ENTER_PYTHON(tstate)
+#define ENTER_PYTHON
#define LEAVE_PYTHON
#endif
@@ -1160,7 +1164,6 @@
/* Client data struct */
typedef struct {
- PyThreadState *tstate;
PyObject *self;
PyObject *func;
} PythonCmd_ClientData;
@@ -1189,8 +1192,7 @@
PyObject *self, *func, *arg, *res, *tmp;
int i;
- /* XXX Should create fresh thread state? */
- ENTER_PYTHON(data->tstate)
+ ENTER_PYTHON
/* TBD: no error checking here since we know, via the
* Tkapp_CreateCommand() that the client data is a two-tuple
@@ -1235,7 +1237,7 @@
{
PythonCmd_ClientData *data = (PythonCmd_ClientData *)clientData;
- ENTER_PYTHON(data->tstate)
+ ENTER_PYTHON
Py_XDECREF(data->self);
Py_XDECREF(data->func);
PyMem_DEL(data);
@@ -1264,7 +1266,6 @@
data = PyMem_NEW(PythonCmd_ClientData, 1);
if (!data)
return NULL;
- data->tstate = PyThreadState_Get();
Py_XINCREF(self);
Py_XINCREF(func);
data->self = self;
@@ -1313,7 +1314,6 @@
/** File Handler **/
typedef struct _fhcdata {
- PyThreadState *tstate;
PyObject *func;
PyObject *file;
int id;
@@ -1333,7 +1333,6 @@
if (p != NULL) {
Py_XINCREF(func);
Py_XINCREF(file);
- p->tstate = PyThreadState_Get();
p->func = func;
p->file = file;
p->id = id;
@@ -1370,8 +1369,7 @@
FileHandler_ClientData *data = (FileHandler_ClientData *)clientData;
PyObject *func, *file, *arg, *res;
- /* XXX Should create fresh thread state? */
- ENTER_PYTHON(data->tstate)
+ ENTER_PYTHON
func = data->func;
file = data->file;
@@ -1500,7 +1498,6 @@
PyObject_HEAD
Tcl_TimerToken token;
PyObject *func;
- PyThreadState *tstate;
} TkttObject;
static PyObject *
@@ -1545,7 +1542,6 @@
Py_INCREF(func);
v->token = NULL;
v->func = func;
- v->tstate = PyThreadState_Get();
/* Extra reference, deleted when called or when handler is deleted */
Py_INCREF(v);
@@ -1620,7 +1616,7 @@
v->func = NULL;
- ENTER_PYTHON(v->tstate)
+ ENTER_PYTHON
res = PyEval_CallObject(func, NULL);
Py_DECREF(func);
@@ -1667,6 +1663,9 @@
PyObject *args;
{
int threshold = 0;
+#ifdef WITH_THREAD
+ PyThreadState *tstate = PyThreadState_Get();
+#endif
if (!PyArg_ParseTuple(args, "|i", &threshold))
return NULL;
@@ -1681,7 +1680,9 @@
#ifdef WITH_THREAD
Py_BEGIN_ALLOW_THREADS
acquire_lock(tcl_lock, 1);
+ tcl_tstate = tstate;
result = Tcl_DoOneEvent(TCL_DONT_WAIT);
+ tcl_tstate = NULL;
release_lock(tcl_lock);
if (result == 0)
Sleep(20);
@@ -1898,6 +1899,9 @@
static int
EventHook()
{
+#if defined(WITH_THREAD) || defined(MS_WINDOWS)
+ PyThreadState *tstate = PyThreadState_Get();
+#endif
#ifndef MS_WINDOWS
FHANDLE tfile;
#endif
@@ -1919,7 +1923,11 @@
#if defined(WITH_THREAD) || defined(MS_WINDOWS)
Py_BEGIN_ALLOW_THREADS
acquire_lock(tcl_lock, 1);
+ tcl_tstate = tstate;
+
result = Tcl_DoOneEvent(TCL_DONT_WAIT);
+
+ tcl_tstate = NULL;
release_lock(tcl_lock);
if (result == 0)
Sleep(20);