Added PyScModule to forward simulation phase callbacks

PyScModule.cpp

@@ -0,0 +1,57 @@
+/*
+ * PyScModule.cpp
+ *
+ *  Created on: 08.06.2019
+ *      Author: eyck
+ */
+
+#include "PyScModule.h"
+#define PY_SSIZE_T_CLEAN
+#include <python3.6/Python.h>
+
+class TPyScriptThreadLocker {
+    PyGILState_STATE m_state;
+public:
+    TPyScriptThreadLocker(): m_state(PyGILState_Ensure()) {}
+    ~TPyScriptThreadLocker() { PyGILState_Release(m_state); }
+};
+
+scc::PyScModule::PyScModule(PyObject*  self, const sc_core::sc_module_name& nm)
+: sc_core::sc_module(nm)
+, self(self)
+{
+    if (! PyEval_ThreadsInitialized())
+        PyEval_InitThreads();
+    Py_INCREF(self);
+}
+
+scc::PyScModule::~PyScModule() {
+    Py_DECREF(self);
+}
+
+void scc::PyScModule::before_end_of_elaboration(){
+    invoke_callback("BeforeEndOfElaboration");
+}
+
+void scc::PyScModule::end_of_elaboration(){
+    invoke_callback("EndOfElaboration");
+}
+void scc::PyScModule::start_of_simulation(){
+    invoke_callback("StartOfSimulation");
+}
+
+void scc::PyScModule::end_of_simulation(){
+    invoke_callback("EndOfSimulation");
+}
+
+void scc::PyScModule::invoke_callback(const char* callback_name) {
+    // acquiring the GIL
+    PyGILState_STATE gstate;
+    gstate = PyGILState_Ensure();
+    if(PyObject_HasAttrString(self, callback_name)){
+        auto* func = PyObject_GetAttrString(self, callback_name);
+        PyObject_CallFunctionObjArgs(func, nullptr);
+    }
+    // Release the thread. No Python API allowed beyond this point.
+    PyGILState_Release(gstate);
+}