superkaramba: fixed SEGV when loading python scripts.

This resolves issue #43.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

superkaramba/src/karamba.cpp

@@ -310,7 +310,7 @@ karamba::karamba(TQString fn, TQString name, bool reloading, int instance,
     move(xpos, ypos);
   }
 
-  haveUpdated = 0;
+  haveUpdated = false;
   this->setMouseTracking(true);
 
 
@@ -1691,14 +1691,13 @@ void karamba::step()
 
   if (pythonIface && pythonIface->isExtensionLoaded())
   {
-    if (haveUpdated == 0)
+    if (!haveUpdated)
       pythonIface->initWidget(this);
     else
       pythonIface->widgetUpdated(this);
   }
 
-  if (haveUpdated == 0)
-    haveUpdated = 1;
+  haveUpdated = true;
 }
 
 void karamba::widgetClosed()

superkaramba/src/karamba_python.cpp

@@ -51,12 +51,7 @@ struct module_state {
     PyObject *error;
 };
 
-#if PY_MAJOR_VERSION >= 3
 #define GETSTATE(m) ((struct module_state*)PyModule_GetState(m))
-#else
-#define GETSTATE(m) (&_state)
-static struct module_state _state;
-#endif
 
 static PyObject *
 error_out(PyObject *m) {
@@ -356,8 +351,6 @@ static PyMethodDef karamba_methods[] = {
     {NULL, NULL, 0 ,NULL}
 };
 
-#if PY_MAJOR_VERSION >= 3
-
 static int karamba_traverse(PyObject *m, visitproc visit, void *arg) {
     Py_VISIT(GETSTATE(m)->error);
     return 0;
@@ -382,22 +375,18 @@ static struct PyModuleDef karambadef = {
 
 #define INITERROR return NULL
 
-#else
-
-#define INITERROR return
-
-#endif
+PyMODINIT_FUNC PyInit_karamba(void)
+{
+	return PyModule_Create(&karambadef);
+}
 
 PyThreadState* KarambaPython::mainThreadState = 0;
 
 KarambaPython::KarambaPython(const ThemeFile& theme, bool reloading):
   pythonThemeExtensionLoaded(false), pName(0), pModule(0), pDict(0)
 {
-  PyThreadState* myThreadState;
   char pypath[1024];
 
-  getLock(&myThreadState);
-
   // load the .py file for this .theme
   PyRun_SimpleString((char*)"import sys");
   //Add theme path to python path so that we can find the python file
@@ -405,13 +394,7 @@ KarambaPython::KarambaPython(const ThemeFile& theme, bool reloading):
   PyRun_SimpleString(pypath);
   PyRun_SimpleString((char*)"sys.path.insert(0, '')");
 
-  PyImport_AddModule((char*)"karamba");
-#if PY_MAJOR_VERSION >= 3
-  PyModule_Create(&karambadef);
-#else
-  Py_InitModule((char*)"karamba", karamba_methods);
-#endif
-  pName = PyBytes_FromString(theme.pythonModule().ascii());
+  pName = PyUnicode_FromString(theme.pythonModule().utf8());
   pModule = PyImport_Import(pName);
   
   fprintf(stderr, "%s\n", pypath);
@@ -443,72 +426,40 @@ KarambaPython::KarambaPython(const ThemeFile& theme, bool reloading):
     fprintf(stderr,
             "------------------------------------------------------\n");
   }
-  releaseLock(myThreadState);
 }
 
 KarambaPython::~KarambaPython()
 {
   //Clean up Python references
   if (pythonThemeExtensionLoaded) {
-    PyThreadState* myThreadState;
-    getLock(&myThreadState);
-
     //Displose of current python module so we can reload in constructor.
     Py_DECREF(pModule);
     Py_DECREF(pName);
-
-    releaseLock(myThreadState);
   }
 }
 
 void KarambaPython::initPython()
 {
   // initialize Python
+	PyImport_AppendInittab((char*)"karamba", PyInit_karamba);
   Py_Initialize();
 
+#if PY_MAJOR_VERSION >= 3 && PY_MINOR_VERSION <= 6
   // initialize thread support
   PyEval_InitThreads();
+#endif
 
   // save a pointer to the main PyThreadState object
   mainThreadState = PyThreadState_Get();
-
-  // release the lock
-  PyEval_ReleaseLock();
 }
 
 void KarambaPython::shutdownPython()
 {
   // shut down the interpreter
-  PyInterpreterState * mainInterpreterState = mainThreadState->interp;
-  // create a thread state object for this thread
-  PyThreadState * myThreadState = PyThreadState_New(mainInterpreterState);
-  PyThreadState_Swap(myThreadState);
-  PyEval_AcquireLock();
+	PyThreadState_Swap(mainThreadState);
   Py_Finalize();
 }
 
-void KarambaPython::getLock(PyThreadState** myThreadState)
-{
-  // get the global lock
-  PyEval_AcquireLock();
-
-  // create a thread state object for this thread
-  *myThreadState = PyThreadState_New(mainThreadState->interp);
-  PyThreadState_Swap(*myThreadState);
-}
-
-void KarambaPython::releaseLock(PyThreadState* myThreadState)
-{
-  // swap my thread state out of the interpreter
-  PyThreadState_Swap(NULL);
-  // clear out any cruft from thread state object
-  PyThreadState_Clear(myThreadState);
-  // delete my thread state object
-  PyThreadState_Delete(myThreadState);
-  // release the lock
-  PyEval_ReleaseLock();
-}
-
 PyObject* KarambaPython::getFunc(const char* function)
 {
   PyObject* pFunc = PyDict_GetItemString(pDict, (char*)function);
@@ -517,17 +468,11 @@ PyObject* KarambaPython::getFunc(const char* function)
   return NULL;
 }
 
-bool KarambaPython::callObject(const char* func, PyObject* pArgs, bool lock)
+bool KarambaPython::callObject(const char* func, PyObject* pArgs)
 {
   bool result = false;
-  PyThreadState* myThreadState;
 
-  //tqDebug("Calling %s", func);
-
-  if (lock)
-    getLock(&myThreadState);
   PyObject* pFunc = getFunc(func);
-
   if (pFunc != NULL)
   {
     PyObject* pValue = PyObject_CallObject(pFunc, pArgs);
@@ -544,8 +489,6 @@ bool KarambaPython::callObject(const char* func, PyObject* pArgs, bool lock)
     }
   }
   Py_DECREF(pArgs);
-  if (lock)
-    releaseLock(myThreadState);
   return result;
 }
 
@@ -597,8 +540,7 @@ bool KarambaPython::widgetClicked(karamba* k, int x, int y, int button)
   return callObject("widgetClicked", pArgs);
 }
 
-bool KarambaPython::keyPressed(karamba* k, const Meter* meter,
-                               const TQString& text)
+bool KarambaPython::keyPressed(karamba* k, const Meter* meter, const TQString& text)
 {
   PyObject* pArgs = Py_BuildValue((char*)"(lls)", k, meter, text.ucs2());
   return callObject("keyPressed", pArgs);
@@ -660,13 +602,8 @@ bool KarambaPython::itemDropped(karamba* k, TQString text, int x, int y)
 
 bool KarambaPython::themeNotify(karamba* k, const char *from, const char *str)
 {
-  // WARNING WARNING WARNING i had to switch off thread locking to get
-  // this to work.  callNotify is called from INSIDE another locked thread,
-  // so can never complete because themeNotify will expect locking to be
-  // released...
-  //
   PyObject* pArgs = Py_BuildValue((char*)"(lss)", k, from, str);
-  return callObject("themeNotify", pArgs, false);
+  return callObject("themeNotify", pArgs);
 }
 
 bool KarambaPython::systrayUpdated(karamba* k)

superkaramba/src/karamba_python.h

@@ -45,10 +45,8 @@ protected:
   PyObject *pDict;
   static PyThreadState* mainThreadState;
 
-  void getLock(PyThreadState** myThreadState);
   PyObject* getFunc(const char* function);
-  void releaseLock(PyThreadState* myThreadState);
-  bool callObject(const char* func, PyObject* pArgs, bool lock=true);
+  bool callObject(const char* func, PyObject* pArgs);
 
 public:
   KarambaPython(const ThemeFile& theme, bool reloading);