Finish refactoring to separate files.

src/greenlet/TExceptionState.cpp

@@ -0,0 +1,62 @@
+#ifndef GREENLET_EXCEPTION_STATE_CPP
+#define GREENLET_EXCEPTION_STATE_CPP
+
+#include <Python.h>
+#include "greenlet_greenlet.hpp"
+
+namespace greenlet {
+
+
+ExceptionState::ExceptionState()
+{
+    this->clear();
+}
+
+void ExceptionState::operator<<(const PyThreadState *const tstate) noexcept
+{
+    this->exc_info = tstate->exc_info;
+    this->exc_state = tstate->exc_state;
+}
+
+void ExceptionState::operator>>(PyThreadState *const tstate) noexcept
+{
+    tstate->exc_state = this->exc_state;
+    tstate->exc_info =
+        this->exc_info ? this->exc_info : &tstate->exc_state;
+    this->clear();
+}
+
+void ExceptionState::clear() noexcept
+{
+    this->exc_info = nullptr;
+    this->exc_state.exc_value = nullptr;
+#if !GREENLET_PY311
+    this->exc_state.exc_type = nullptr;
+    this->exc_state.exc_traceback = nullptr;
+#endif
+    this->exc_state.previous_item = nullptr;
+}
+
+int ExceptionState::tp_traverse(visitproc visit, void* arg) noexcept
+{
+    Py_VISIT(this->exc_state.exc_value);
+#if !GREENLET_PY311
+    Py_VISIT(this->exc_state.exc_type);
+    Py_VISIT(this->exc_state.exc_traceback);
+#endif
+    return 0;
+}
+
+void ExceptionState::tp_clear() noexcept
+{
+    Py_CLEAR(this->exc_state.exc_value);
+#if !GREENLET_PY311
+    Py_CLEAR(this->exc_state.exc_type);
+    Py_CLEAR(this->exc_state.exc_traceback);
+#endif
+}
+
+
+}; // namespace greenlet
+
+#endif // GREENLET_EXCEPTION_STATE_CPP

src/greenlet/TGreenlet.cpp

@@ -601,4 +601,10 @@ Greenlet::tp_clear()
     return 0;
 }
 
+bool Greenlet::is_currently_running_in_some_thread() const
+{
+    return this->stack_state.active() && !this->python_state.top_frame();
+}
+
+
 }; // namespace greenlet