embedded sample's README updates

[wxWidgets.git] / wxPython / src / helpers.cpp

diff --git a/wxPython/src/helpers.cpp b/wxPython/src/helpers.cpp
index 79c46641b62260cc49f56cd4fae0df2f64b6f40b..7ad042c032e8ae19176080e5de23011e6e24de29 100644 (file)
--- a/wxPython/src/helpers.cpp
+++ b/wxPython/src/helpers.cpp
@@ -53,10 +53,9 @@ bool wxPyDoingCleanup = False;
 struct wxPyThreadState {
     unsigned long  tid;
     PyThreadState* tstate;
 struct wxPyThreadState {
     unsigned long  tid;
     PyThreadState* tstate;

-    int            blocked;

 
     wxPyThreadState(unsigned long _tid=0, PyThreadState* _tstate=NULL)
 
     wxPyThreadState(unsigned long _tid=0, PyThreadState* _tstate=NULL)

-        : tid(_tid), tstate(_tstate), blocked(1) {}
+        : tid(_tid), tstate(_tstate) {}

 };
 
 #include <wx/dynarray.h>
 };
 
 #include <wx/dynarray.h>


@@ -137,20 +136,20 @@ int  wxPyApp::MainLoop() {
 bool wxPyApp::OnInitGui() {
     bool rval=True;
     wxApp::OnInitGui();  // in this case always call the base class version
 bool wxPyApp::OnInitGui() {
     bool rval=True;
     wxApp::OnInitGui();  // in this case always call the base class version

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     if (wxPyCBH_findCallback(m_myInst, "OnInitGui"))
         rval = wxPyCBH_callCallback(m_myInst, Py_BuildValue("()"));
     if (wxPyCBH_findCallback(m_myInst, "OnInitGui"))
         rval = wxPyCBH_callCallback(m_myInst, Py_BuildValue("()"));

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

     return rval;
 }
 
 
 int wxPyApp::OnExit() {
     int rval=0;
     return rval;
 }
 
 
 int wxPyApp::OnExit() {
     int rval=0;

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     if (wxPyCBH_findCallback(m_myInst, "OnExit"))
         rval = wxPyCBH_callCallback(m_myInst, Py_BuildValue("()"));
     if (wxPyCBH_findCallback(m_myInst, "OnExit"))
         rval = wxPyCBH_callCallback(m_myInst, Py_BuildValue("()"));

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

     wxApp::OnExit();  // in this case always call the base class version
     return rval;
 }
     wxApp::OnExit();  // in this case always call the base class version
     return rval;
 }


@@ -178,7 +177,7 @@ void wxPyApp::OnAssert(const wxChar *file,
 
     // If the OnAssert is overloaded in the Python class then call it...
     bool found;
 
     // If the OnAssert is overloaded in the Python class then call it...
     bool found;

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     if ((found = wxPyCBH_findCallback(m_myInst, "OnAssert"))) {
         PyObject* fso = wx2PyString(file);
         PyObject* cso = wx2PyString(file);
     if ((found = wxPyCBH_findCallback(m_myInst, "OnAssert"))) {
         PyObject* fso = wx2PyString(file);
         PyObject* cso = wx2PyString(file);


@@ -193,7 +192,7 @@ void wxPyApp::OnAssert(const wxChar *file,
         Py_DECREF(cso);
         Py_DECREF(mso);
     }
         Py_DECREF(cso);
         Py_DECREF(mso);
     }

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

 
     // ...otherwise do our own thing with it
     if (! found) {
 
     // ...otherwise do our own thing with it
     if (! found) {


@@ -212,11 +211,11 @@ void wxPyApp::OnAssert(const wxChar *file,
             }
 
             // set the exception
             }
 
             // set the exception

-            wxPyBeginBlockThreads();
+            bool blocked = wxPyBeginBlockThreads();

             PyObject* s = wx2PyString(buf);
             PyErr_SetObject(wxPyAssertionError, s);
             Py_DECREF(s);
             PyObject* s = wx2PyString(buf);
             PyErr_SetObject(wxPyAssertionError, s);
             Py_DECREF(s);

-            wxPyEndBlockThreads();
+            wxPyEndBlockThreads(blocked);

 
             // Now when control returns to whatever API wrapper was called from
             // Python it should detect that an exception is set and will return
 
             // Now when control returns to whatever API wrapper was called from
             // Python it should detect that an exception is set and will return


@@ -247,40 +246,40 @@ void wxPyApp::OnAssert(const wxChar *file,
     // For catching Apple Events
 void wxPyApp::MacOpenFile(const wxString &fileName)
 {
     // For catching Apple Events
 void wxPyApp::MacOpenFile(const wxString &fileName)
 {

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     if (wxPyCBH_findCallback(m_myInst, "MacOpenFile")) {
         PyObject* s = wx2PyString(fileName);
         wxPyCBH_callCallback(m_myInst, Py_BuildValue("(O)", s));
         Py_DECREF(s);
     }
     if (wxPyCBH_findCallback(m_myInst, "MacOpenFile")) {
         PyObject* s = wx2PyString(fileName);
         wxPyCBH_callCallback(m_myInst, Py_BuildValue("(O)", s));
         Py_DECREF(s);
     }

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

 }
 
 void wxPyApp::MacPrintFile(const wxString &fileName)
 {
 }
 
 void wxPyApp::MacPrintFile(const wxString &fileName)
 {

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     if (wxPyCBH_findCallback(m_myInst, "MacPrintFile")) {
         PyObject* s = wx2PyString(fileName);
         wxPyCBH_callCallback(m_myInst, Py_BuildValue("(O)", s));
         Py_DECREF(s);
     }
     if (wxPyCBH_findCallback(m_myInst, "MacPrintFile")) {
         PyObject* s = wx2PyString(fileName);
         wxPyCBH_callCallback(m_myInst, Py_BuildValue("(O)", s));
         Py_DECREF(s);
     }

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

 }
 
 void wxPyApp::MacNewFile()
 {
 }
 
 void wxPyApp::MacNewFile()
 {

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     if (wxPyCBH_findCallback(m_myInst, "MacNewFile"))
         wxPyCBH_callCallback(m_myInst, Py_BuildValue("()"));
     if (wxPyCBH_findCallback(m_myInst, "MacNewFile"))
         wxPyCBH_callCallback(m_myInst, Py_BuildValue("()"));

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

 }
 
 void wxPyApp::MacReopenApp()
 {
 }
 
 void wxPyApp::MacReopenApp()
 {

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     if (wxPyCBH_findCallback(m_myInst, "MacReopenApp"))
         wxPyCBH_callCallback(m_myInst, Py_BuildValue("()"));
     if (wxPyCBH_findCallback(m_myInst, "MacReopenApp"))
         wxPyCBH_callCallback(m_myInst, Py_BuildValue("()"));

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

 }
 
 
 }
 
 


@@ -377,7 +376,7 @@ void wxPyApp::_BootstrapApp()
     // Get any command-line args passed to this program from the sys module
     int    argc = 0;
     char** argv = NULL;
     // Get any command-line args passed to this program from the sys module
     int    argc = 0;
     char** argv = NULL;

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     PyObject* sysargv = PySys_GetObject("argv");
     if (sysargv != NULL) {
         argc = PyList_Size(sysargv);
     PyObject* sysargv = PySys_GetObject("argv");
     if (sysargv != NULL) {
         argc = PyList_Size(sysargv);


@@ -389,12 +388,12 @@ void wxPyApp::_BootstrapApp()
         }
         argv[argc] = NULL;
     }
         }
         argv[argc] = NULL;
     }

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

 
     result = wxEntryStart(argc, argv);
     delete [] argv;
 
 
     result = wxEntryStart(argc, argv);
     delete [] argv;
 

-    wxPyBeginBlockThreads();
+    blocked = wxPyBeginBlockThreads();

     if (! result)  {
         PyErr_SetString(PyExc_SystemError, "wxEntryStart failed!");
         goto error;
     if (! result)  {
         PyErr_SetString(PyExc_SystemError, "wxEntryStart failed!");
         goto error;


@@ -439,7 +438,7 @@ void wxPyApp::_BootstrapApp()
     Py_XDECREF(retval);
     Py_XDECREF(pyint);
 
     Py_XDECREF(retval);
     Py_XDECREF(pyint);
 

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

 };
 
 //---------------------------------------------------------------------
 };
 
 //---------------------------------------------------------------------


@@ -724,6 +723,16 @@ void wxPy_ReinitStockObjects(int pass)
     else if (pass == 2) { rsoPass2(#name); } \
     else if (pass == 3) { rsoPass3(#name, #classname, (void*)&name); }
 
     else if (pass == 2) { rsoPass2(#name); } \
     else if (pass == 3) { rsoPass3(#name, #classname, (void*)&name); }
 

+    // If there is already an App object then wxPython is probably embedded in
+    // a wx C++ application, so there is no need to do all this.
+    static bool embedded = false;
+    if ((pass == 1 || pass == 2) && wxTheApp) {
+        embedded = true;
+        return;
+    }
+    if (pass == 3 && embedded)
+        return;
+    

 
     REINITOBJ(wxNORMAL_FONT, wxFont);
     REINITOBJ(wxSMALL_FONT, wxFont);
 
     REINITOBJ(wxNORMAL_FONT, wxFont);
     REINITOBJ(wxSMALL_FONT, wxFont);


@@ -793,19 +802,19 @@ void wxPy_ReinitStockObjects(int pass)
 void wxPyClientData_dtor(wxPyClientData* self) {
     if (! wxPyDoingCleanup) {           // Don't do it during cleanup as Python
                                         // may have already garbage collected the object...
 void wxPyClientData_dtor(wxPyClientData* self) {
     if (! wxPyDoingCleanup) {           // Don't do it during cleanup as Python
                                         // may have already garbage collected the object...

-        wxPyBeginBlockThreads();
+        bool blocked = wxPyBeginBlockThreads();

         Py_DECREF(self->m_obj);
         self->m_obj = NULL;
         Py_DECREF(self->m_obj);
         self->m_obj = NULL;

-        wxPyEndBlockThreads();
+        wxPyEndBlockThreads(blocked);

     }
 }
 
 void wxPyUserData_dtor(wxPyUserData* self) {
     if (! wxPyDoingCleanup) {
     }
 }
 
 void wxPyUserData_dtor(wxPyUserData* self) {
     if (! wxPyDoingCleanup) {

-        wxPyBeginBlockThreads();
+        bool blocked = wxPyBeginBlockThreads();

         Py_DECREF(self->m_obj);
         self->m_obj = NULL;
         Py_DECREF(self->m_obj);
         self->m_obj = NULL;

-        wxPyEndBlockThreads();
+        wxPyEndBlockThreads(blocked);

     }
 }
 
     }
 }
 


@@ -822,7 +831,7 @@ void wxPyOORClientData_dtor(wxPyOORClientData* self) {
 
     static PyObject* deadObjectClass = NULL;
 
 
     static PyObject* deadObjectClass = NULL;
 

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     if (deadObjectClass == NULL) {
         deadObjectClass = PyDict_GetItemString(wxPython_dict, "_wxPyDeadObject");
         // TODO:  Can not wxASSERT here because inside a wxPyBeginBlock Threads,
     if (deadObjectClass == NULL) {
         deadObjectClass = PyDict_GetItemString(wxPython_dict, "_wxPyDeadObject");
         // TODO:  Can not wxASSERT here because inside a wxPyBeginBlock Threads,


@@ -867,7 +876,7 @@ void wxPyOORClientData_dtor(wxPyOORClientData* self) {
     }
 
     // m_obj is DECREF'd in the base class dtor...
     }
 
     // m_obj is DECREF'd in the base class dtor...

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

 }
 
 
 }
 
 


@@ -1038,7 +1047,6 @@ PyThreadState* wxPyBeginAllowThreads() {
 #ifdef WXP_WITH_THREAD
     PyThreadState* saved = PyEval_SaveThread();  // Py_BEGIN_ALLOW_THREADS;
     wxPySaveThreadState(saved);
 #ifdef WXP_WITH_THREAD
     PyThreadState* saved = PyEval_SaveThread();  // Py_BEGIN_ALLOW_THREADS;
     wxPySaveThreadState(saved);

-    wxPyGetThreadState()->blocked -= 1;

     return saved;
 #else
     return NULL;
     return saved;
 #else
     return NULL;


@@ -1047,7 +1055,6 @@ PyThreadState* wxPyBeginAllowThreads() {
 
 void wxPyEndAllowThreads(PyThreadState* saved) {
 #ifdef WXP_WITH_THREAD
 
 void wxPyEndAllowThreads(PyThreadState* saved) {
 #ifdef WXP_WITH_THREAD

-    wxPyGetThreadState()->blocked += 1;

     PyEval_RestoreThread(saved);   // Py_END_ALLOW_THREADS;
 #endif
 }
     PyEval_RestoreThread(saved);   // Py_END_ALLOW_THREADS;
 #endif
 }


@@ -1057,21 +1064,33 @@ void wxPyEndAllowThreads(PyThreadState* saved) {
 // Calls from wxWindows back to Python code, or even any PyObject
 // manipulations, PyDECREF's and etc. are wrapped in calls to these functions:
 
 // Calls from wxWindows back to Python code, or even any PyObject
 // manipulations, PyDECREF's and etc. are wrapped in calls to these functions:
 

-void wxPyBeginBlockThreads() {
+bool wxPyBeginBlockThreads() {

 #ifdef WXP_WITH_THREAD
 #ifdef WXP_WITH_THREAD

+    // This works in for 2.3, maybe a good alternative to find the needed tstate?
+    // PyThreadState *check = PyGILState_GetThisThreadState();  
+
+    PyThreadState *current = _PyThreadState_Current;
+
+    // Only block if there wasn't already a tstate, or if the current one is
+    // not the one we are wanting to change to.  This should prevent deadlock
+    // if there are nested calls to wxPyBeginBlockThreads
+    bool blocked = false;

     wxPyThreadState* tstate = wxPyGetThreadState();
     wxPyThreadState* tstate = wxPyGetThreadState();

-    if (tstate->blocked++ == 0) {  // if nested calls then do nothing
+    if (current != tstate->tstate) {

         PyEval_RestoreThread(tstate->tstate);
         PyEval_RestoreThread(tstate->tstate);

+        blocked = true;

     }
     }

+    return blocked;

 #endif
 }
 
 
 #endif
 }
 
 

-void wxPyEndBlockThreads() {
+void wxPyEndBlockThreads(bool blocked) {

 #ifdef WXP_WITH_THREAD
 #ifdef WXP_WITH_THREAD

-    wxPyThreadState* tstate = wxPyGetThreadState();
-    tstate->blocked -= 1;
-    if ( tstate->blocked == 0) {  // if nested calls then do nothing
+    // Only unblock if we blocked in the last call to wxPyBeginBlockThreads.
+    // The value of blocked passed in needs to be the same as that returned
+    // from wxPyBeginBlockThreads at the same nesting level.
+    if ( blocked ) {

         PyEval_SaveThread();
     }
 #endif
         PyEval_SaveThread();
     }
 #endif


@@ -1111,9 +1130,9 @@ PyObject* wxPyInputStream::read(int size) {
 
     // check if we have a real wxInputStream to work with
     if (!m_wxis) {
 
     // check if we have a real wxInputStream to work with
     if (!m_wxis) {

-        wxPyBeginBlockThreads();
+        bool blocked = wxPyBeginBlockThreads();

         PyErr_SetString(PyExc_IOError, "no valid C-wxInputStream");
         PyErr_SetString(PyExc_IOError, "no valid C-wxInputStream");

-        wxPyEndBlockThreads();
+        wxPyEndBlockThreads(blocked);

         return NULL;
     }
 
         return NULL;
     }
 


@@ -1130,7 +1149,7 @@ PyObject* wxPyInputStream::read(int size) {
     }
 
     // error check
     }
 
     // error check

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     wxStreamError err = m_wxis->GetLastError();
     if (err != wxSTREAM_NO_ERROR && err != wxSTREAM_EOF) {
         PyErr_SetString(PyExc_IOError,"IOError in wxInputStream");
     wxStreamError err = m_wxis->GetLastError();
     if (err != wxSTREAM_NO_ERROR && err != wxSTREAM_EOF) {
         PyErr_SetString(PyExc_IOError,"IOError in wxInputStream");


@@ -1139,7 +1158,7 @@ PyObject* wxPyInputStream::read(int size) {
         // We use only strings for the streams, not unicode
         obj = PyString_FromStringAndSize(buf, buf.GetDataLen());
     }
         // We use only strings for the streams, not unicode
         obj = PyString_FromStringAndSize(buf, buf.GetDataLen());
     }

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

     return obj;
 }
 
     return obj;
 }
 


@@ -1152,9 +1171,9 @@ PyObject* wxPyInputStream::readline(int size) {
 
     // check if we have a real wxInputStream to work with
     if (!m_wxis) {
 
     // check if we have a real wxInputStream to work with
     if (!m_wxis) {

-        wxPyBeginBlockThreads();
+        bool blocked = wxPyBeginBlockThreads();

         PyErr_SetString(PyExc_IOError,"no valid C-wxInputStream");
         PyErr_SetString(PyExc_IOError,"no valid C-wxInputStream");

-        wxPyEndBlockThreads();
+        wxPyEndBlockThreads(blocked);

         return NULL;
     }
 
         return NULL;
     }
 


@@ -1165,7 +1184,7 @@ PyObject* wxPyInputStream::readline(int size) {
     }
 
     // errorcheck
     }
 
     // errorcheck

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     wxStreamError err = m_wxis->GetLastError();
     if (err != wxSTREAM_NO_ERROR && err != wxSTREAM_EOF) {
         PyErr_SetString(PyExc_IOError,"IOError in wxInputStream");
     wxStreamError err = m_wxis->GetLastError();
     if (err != wxSTREAM_NO_ERROR && err != wxSTREAM_EOF) {
         PyErr_SetString(PyExc_IOError,"IOError in wxInputStream");


@@ -1174,7 +1193,7 @@ PyObject* wxPyInputStream::readline(int size) {
         // We use only strings for the streams, not unicode
         obj = PyString_FromStringAndSize((char*)buf.GetData(), buf.GetDataLen());
     }
         // We use only strings for the streams, not unicode
         obj = PyString_FromStringAndSize((char*)buf.GetData(), buf.GetDataLen());
     }

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

     return obj;
 }
 
     return obj;
 }
 


@@ -1184,19 +1203,21 @@ PyObject* wxPyInputStream::readlines(int sizehint) {
 
     // check if we have a real wxInputStream to work with
     if (!m_wxis) {
 
     // check if we have a real wxInputStream to work with
     if (!m_wxis) {

-        wxPyBeginBlockThreads();
+        bool blocked = wxPyBeginBlockThreads();

         PyErr_SetString(PyExc_IOError,"no valid C-wxInputStream");
         PyErr_SetString(PyExc_IOError,"no valid C-wxInputStream");

-        wxPyEndBlockThreads();
+        wxPyEndBlockThreads(blocked);

         return NULL;
     }
 
     // init list
         return NULL;
     }
 
     // init list

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     pylist = PyList_New(0);
     pylist = PyList_New(0);

+    wxPyEndBlockThreads(blocked);
+    

     if (!pylist) {
     if (!pylist) {

-        wxPyBeginBlockThreads();
+        bool blocked = wxPyBeginBlockThreads();

         PyErr_NoMemory();
         PyErr_NoMemory();

-        wxPyEndBlockThreads();
+        wxPyEndBlockThreads(blocked);

         return NULL;
     }
 
         return NULL;
     }
 


@@ -1205,24 +1226,24 @@ PyObject* wxPyInputStream::readlines(int sizehint) {
     for (i=0; (m_wxis->CanRead()) && ((sizehint < 0) || (i < sizehint));) {
         PyObject* s = this->readline();
         if (s == NULL) {
     for (i=0; (m_wxis->CanRead()) && ((sizehint < 0) || (i < sizehint));) {
         PyObject* s = this->readline();
         if (s == NULL) {

-            wxPyBeginBlockThreads();
+            bool blocked = wxPyBeginBlockThreads();

             Py_DECREF(pylist);
             Py_DECREF(pylist);

-            wxPyEndBlockThreads();
+            wxPyEndBlockThreads(blocked);

             return NULL;
         }
             return NULL;
         }

-        wxPyBeginBlockThreads();
+        bool blocked = wxPyBeginBlockThreads();

         PyList_Append(pylist, s);
         i += PyString_Size(s);
         PyList_Append(pylist, s);
         i += PyString_Size(s);

-        wxPyEndBlockThreads();
+        wxPyEndBlockThreads(blocked);

     }
 
     // error check
     wxStreamError err = m_wxis->GetLastError();
     if (err != wxSTREAM_NO_ERROR && err != wxSTREAM_EOF) {
     }
 
     // error check
     wxStreamError err = m_wxis->GetLastError();
     if (err != wxSTREAM_NO_ERROR && err != wxSTREAM_EOF) {

-        wxPyBeginBlockThreads();
+        bool blocked = wxPyBeginBlockThreads();

         Py_DECREF(pylist);
         PyErr_SetString(PyExc_IOError,"IOError in wxInputStream");
         Py_DECREF(pylist);
         PyErr_SetString(PyExc_IOError,"IOError in wxInputStream");

-        wxPyEndBlockThreads();
+        wxPyEndBlockThreads(blocked);

         return NULL;
     }
 
         return NULL;
     }
 


@@ -1250,16 +1271,18 @@ wxPyCBInputStream::wxPyCBInputStream(PyObject *r, PyObject *s, PyObject *t, bool
 
 
 wxPyCBInputStream::~wxPyCBInputStream() {
 
 
 wxPyCBInputStream::~wxPyCBInputStream() {

-    if (m_block) wxPyBeginBlockThreads();
+    bool blocked;
+    if (m_block) blocked = wxPyBeginBlockThreads();

     Py_XDECREF(m_read);
     Py_XDECREF(m_seek);
     Py_XDECREF(m_tell);
     Py_XDECREF(m_read);
     Py_XDECREF(m_seek);
     Py_XDECREF(m_tell);

-    if (m_block) wxPyEndBlockThreads();
+    if (m_block) wxPyEndBlockThreads(blocked);

 }
 
 
 wxPyCBInputStream* wxPyCBInputStream::create(PyObject *py, bool block) {
 }
 
 
 wxPyCBInputStream* wxPyCBInputStream::create(PyObject *py, bool block) {

-    if (block) wxPyBeginBlockThreads();
+    bool blocked;
+    if (block) blocked = wxPyBeginBlockThreads();

 
     PyObject* read = getMethod(py, "read");
     PyObject* seek = getMethod(py, "seek");
 
     PyObject* read = getMethod(py, "read");
     PyObject* seek = getMethod(py, "seek");


@@ -1270,11 +1293,11 @@ wxPyCBInputStream* wxPyCBInputStream::create(PyObject *py, bool block) {
         Py_XDECREF(read);
         Py_XDECREF(seek);
         Py_XDECREF(tell);
         Py_XDECREF(read);
         Py_XDECREF(seek);
         Py_XDECREF(tell);

-        if (block) wxPyEndBlockThreads();
+        if (block) wxPyEndBlockThreads(blocked);

         return NULL;
     }
 
         return NULL;
     }
 

-    if (block) wxPyEndBlockThreads();
+    if (block) wxPyEndBlockThreads(blocked);

     return new wxPyCBInputStream(read, seek, tell, block);
 }
 
     return new wxPyCBInputStream(read, seek, tell, block);
 }
 


@@ -1312,7 +1335,7 @@ size_t wxPyCBInputStream::OnSysRead(void *buffer, size_t bufsize) {
     if (bufsize == 0)
         return 0;
 
     if (bufsize == 0)
         return 0;
 

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     PyObject* arglist = Py_BuildValue("(i)", bufsize);
     PyObject* result = PyEval_CallObject(m_read, arglist);
     Py_DECREF(arglist);
     PyObject* arglist = Py_BuildValue("(i)", bufsize);
     PyObject* result = PyEval_CallObject(m_read, arglist);
     Py_DECREF(arglist);


@@ -1330,7 +1353,7 @@ size_t wxPyCBInputStream::OnSysRead(void *buffer, size_t bufsize) {
     }
     else
         m_lasterror = wxSTREAM_READ_ERROR;
     }
     else
         m_lasterror = wxSTREAM_READ_ERROR;

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

     return o;
 }
 
     return o;
 }
 


@@ -1340,7 +1363,7 @@ size_t wxPyCBInputStream::OnSysWrite(const void *buffer, size_t bufsize) {
 }
 
 off_t wxPyCBInputStream::OnSysSeek(off_t off, wxSeekMode mode) {
 }
 
 off_t wxPyCBInputStream::OnSysSeek(off_t off, wxSeekMode mode) {

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

 #ifdef _LARGE_FILES
     // off_t is a 64-bit value...
     PyObject* arglist = Py_BuildValue("(Li)", off, mode);
 #ifdef _LARGE_FILES
     // off_t is a 64-bit value...
     PyObject* arglist = Py_BuildValue("(Li)", off, mode);


@@ -1350,13 +1373,13 @@ off_t wxPyCBInputStream::OnSysSeek(off_t off, wxSeekMode mode) {
     PyObject* result = PyEval_CallObject(m_seek, arglist);
     Py_DECREF(arglist);
     Py_XDECREF(result);
     PyObject* result = PyEval_CallObject(m_seek, arglist);
     Py_DECREF(arglist);
     Py_XDECREF(result);

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

     return OnSysTell();
 }
 
 
 off_t wxPyCBInputStream::OnSysTell() const {
     return OnSysTell();
 }
 
 
 off_t wxPyCBInputStream::OnSysTell() const {

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     PyObject* arglist = Py_BuildValue("()");
     PyObject* result = PyEval_CallObject(m_tell, arglist);
     Py_DECREF(arglist);
     PyObject* arglist = Py_BuildValue("()");
     PyObject* result = PyEval_CallObject(m_tell, arglist);
     Py_DECREF(arglist);


@@ -1370,7 +1393,7 @@ off_t wxPyCBInputStream::OnSysTell() const {
             o = PyInt_AsLong(result);
         Py_DECREF(result);
     };
             o = PyInt_AsLong(result);
         Py_DECREF(result);
     };

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

     return o;
 }
 
     return o;
 }
 


@@ -1389,12 +1412,14 @@ wxPyCallback::wxPyCallback(const wxPyCallback& other) {
 }
 
 wxPyCallback::~wxPyCallback() {
 }
 
 wxPyCallback::~wxPyCallback() {

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     Py_DECREF(m_func);
     Py_DECREF(m_func);

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

 }
 
 
 }
 
 

+#define wxPy_PRECALLINIT     "_preCallInit"
+#define wxPy_POSTCALLCLEANUP "_postCallCleanup"

 
 // This function is used for all events destined for Python event handlers.
 void wxPyCallback::EventThunker(wxEvent& event) {
 
 // This function is used for all events destined for Python event handlers.
 void wxPyCallback::EventThunker(wxEvent& event) {


@@ -1405,7 +1430,7 @@ void wxPyCallback::EventThunker(wxEvent& event) {
     PyObject*       tuple;
     bool            checkSkip = False;
 
     PyObject*       tuple;
     bool            checkSkip = False;
 

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     wxString className = event.GetClassInfo()->GetClassName();
 
     // If the event is one of these types then pass the original
     wxString className = event.GetClassInfo()->GetClassName();
 
     // If the event is one of these types then pass the original


@@ -1425,6 +1450,25 @@ void wxPyCallback::EventThunker(wxEvent& event) {
     if (!arg) {
         PyErr_Print();
     } else {
     if (!arg) {
         PyErr_Print();
     } else {

+        // "intern" the pre/post method names to speed up the HasAttr
+        static PyObject* s_preName  = NULL;
+        static PyObject* s_postName = NULL;
+        if (s_preName == NULL) {
+            s_preName  = PyString_FromString(wxPy_PRECALLINIT);
+            s_postName = PyString_FromString(wxPy_POSTCALLCLEANUP);
+        }
+        
+        // Check if the event object needs some preinitialization
+        if (PyObject_HasAttr(arg, s_preName)) {
+            result = PyObject_CallMethodObjArgs(arg, s_preName, arg, NULL);
+            if ( result ) {
+                Py_DECREF(result);   // result is ignored, but we still need to decref it
+                PyErr_Clear();       // Just in case...
+            } else {
+                PyErr_Print();
+            }            
+        }
+        

         // Call the event handler, passing the event object
         tuple = PyTuple_New(1);
         PyTuple_SET_ITEM(tuple, 0, arg);  // steals ref to arg
         // Call the event handler, passing the event object
         tuple = PyTuple_New(1);
         PyTuple_SET_ITEM(tuple, 0, arg);  // steals ref to arg


@@ -1436,6 +1480,17 @@ void wxPyCallback::EventThunker(wxEvent& event) {
             PyErr_Print();
         }
 
             PyErr_Print();
         }
 

+        // Check if the event object needs some post cleanup
+        if (PyObject_HasAttr(arg, s_postName)) {
+            result = PyObject_CallMethodObjArgs(arg, s_postName, arg, NULL);
+            if ( result ) {
+                Py_DECREF(result);   // result is ignored, but we still need to decref it
+                PyErr_Clear();       // Just in case...
+            } else {
+                PyErr_Print();
+            }            
+        }
+

         if ( checkSkip ) {
             // if the event object was one of our special types and
             // it had been cloned, then we need to extract the Skipped
         if ( checkSkip ) {
             // if the event object was one of our special types and
             // it had been cloned, then we need to extract the Skipped


@@ -1450,7 +1505,7 @@ void wxPyCallback::EventThunker(wxEvent& event) {
         }
         Py_DECREF(tuple);
     }
         }
         Py_DECREF(tuple);
     }

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

 }
 
 
 }
 
 


@@ -1635,10 +1690,10 @@ PyObject* wxPyCBH_callCallbackObj(const wxPyCallbackHelper& cbh, PyObject* argTu
 
 void wxPyCBH_delete(wxPyCallbackHelper* cbh) {
     if (cbh->m_incRef) {
 
 void wxPyCBH_delete(wxPyCallbackHelper* cbh) {
     if (cbh->m_incRef) {

-        wxPyBeginBlockThreads();
+        bool blocked = wxPyBeginBlockThreads();

         Py_XDECREF(cbh->m_self);
         Py_XDECREF(cbh->m_class);
         Py_XDECREF(cbh->m_self);
         Py_XDECREF(cbh->m_class);

-        wxPyEndBlockThreads();
+        wxPyEndBlockThreads(blocked);

     }
 }
 
     }
 }
 


@@ -1656,14 +1711,14 @@ wxPyEvtSelfRef::wxPyEvtSelfRef() {
 }
 
 wxPyEvtSelfRef::~wxPyEvtSelfRef() {
 }
 
 wxPyEvtSelfRef::~wxPyEvtSelfRef() {

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     if (m_cloned)
         Py_DECREF(m_self);
     if (m_cloned)
         Py_DECREF(m_self);

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

 }
 
 void wxPyEvtSelfRef::SetSelf(PyObject* self, bool clone) {
 }
 
 void wxPyEvtSelfRef::SetSelf(PyObject* self, bool clone) {

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     if (m_cloned)
         Py_DECREF(m_self);
     m_self = self;
     if (m_cloned)
         Py_DECREF(m_self);
     m_self = self;


@@ -1671,7 +1726,7 @@ void wxPyEvtSelfRef::SetSelf(PyObject* self, bool clone) {
         Py_INCREF(m_self);
         m_cloned = True;
     }
         Py_INCREF(m_self);
         m_cloned = True;
     }

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

 }
 
 PyObject* wxPyEvtSelfRef::GetSelf() const {
 }
 
 PyObject* wxPyEvtSelfRef::GetSelf() const {


@@ -1730,7 +1785,7 @@ PyObject* wxPy_ConvertList(wxListBase* listbase) {
     wxObject*   wxObj;
     wxNode*     node = list->GetFirst();
 
     wxObject*   wxObj;
     wxNode*     node = list->GetFirst();
 

-    wxPyBeginBlockThreads();
+    bool blocked = wxPyBeginBlockThreads();

     pyList = PyList_New(0);
     while (node) {
         wxObj = node->GetData();
     pyList = PyList_New(0);
     while (node) {
         wxObj = node->GetData();


@@ -1738,7 +1793,7 @@ PyObject* wxPy_ConvertList(wxListBase* listbase) {
         PyList_Append(pyList, pyObj);
         node = node->GetNext();
     }
         PyList_Append(pyList, pyObj);
         node = node->GetNext();
     }

-    wxPyEndBlockThreads();
+    wxPyEndBlockThreads(blocked);

     return pyList;
 }
 
     return pyList;
 }