1 files changed, 132 insertions, 0 deletions
diff --git a/pyuno/source/module/pyuno_gc.cxx b/pyuno/source/module/pyuno_gc.cxx
new file mode 100644
index 000000000..1efca400d
--- /dev/null
+++ b/pyuno/source/module/pyuno_gc.cxx
@@ -0,0 +1,132 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "pyuno_impl.hxx"
+
+#include <sal/config.h>
+
+#include <rtl/ref.hxx>
+#include <salhelper/thread.hxx>
+
+namespace pyuno
+{
+
+static bool g_destructorsOfStaticObjectsHaveBeenCalled;
+
+namespace {
+
+class StaticDestructorGuard
+{
+public:
+    ~StaticDestructorGuard()
+    {
+        g_destructorsOfStaticObjectsHaveBeenCalled = true;
+    }
+};
+
+}
+
+static StaticDestructorGuard guard;
+
+static bool isAfterUnloadOrPy_Finalize()
+{
+    return g_destructorsOfStaticObjectsHaveBeenCalled ||
+        !Py_IsInitialized();
+}
+
+namespace {
+
+class GCThread: public salhelper::Thread {
+public:
+    GCThread( PyInterpreterState *interpreter, PyObject * object );
+
+private:
+    virtual ~GCThread() override {}
+
+    virtual void execute() override;
+
+    PyObject *mPyObject;
+    PyInterpreterState *mPyInterpreter;
+};
+
+}
+
+GCThread::GCThread( PyInterpreterState *interpreter, PyObject * object ) :
+    Thread( "pyunoGCThread" ), mPyObject( object ),
+    mPyInterpreter( interpreter )
+{}
+
+void GCThread::execute()
+{
+    //  otherwise we crash here, when main has been left already
+    if( isAfterUnloadOrPy_Finalize() )
+        return;
+    try
+    {
+        PyThreadAttach g( mPyInterpreter );
+        {
+            Runtime runtime;
+
+            // remove the reference from the pythonobject2adapter map
+            PyRef2Adapter::iterator ii =
+                runtime.getImpl()->cargo->mappedObjects.find( mPyObject );
+            if( ii != runtime.getImpl()->cargo->mappedObjects.end() )
+            {
+                runtime.getImpl()->cargo->mappedObjects.erase( ii );
+            }
+
+            Py_XDECREF( mPyObject );
+        }
+    }
+    catch( const css::uno::RuntimeException & e )
+    {
+        OString msg = OUStringToOString( e.Message, RTL_TEXTENCODING_ASCII_US );
+        fprintf( stderr, "Leaking python objects bridged to UNO for reason %s\n",msg.getStr());
+    }
+}
+
+void decreaseRefCount( PyInterpreterState *interpreter, PyObject *object )
+{
+    //  otherwise we crash in the last after main ...
+    if( isAfterUnloadOrPy_Finalize() )
+        return;
+
+    // delegate to a new thread, because there does not seem
+    // to be a method, which tells, whether the global
+    // interpreter lock is held or not
+    // TODO: Look for a more efficient solution
+    try
+    {
+        rtl::Reference< GCThread >(new GCThread(interpreter, object))->launch();
+        //TODO: a protocol is missing how to join with the launched thread
+        // before exit(3), to ensure the thread is no longer relying on any
+        // infrastructure while that infrastructure is being shut down in
+        // atexit handlers
+    }
+    catch (std::runtime_error&)
+    {
+        // tdf#146621: Thread creation will fail on Windows with ERROR_ACCESS_DENIED
+        // when called at ExitProcess time; unhandled exception would hang the process
+        abort();
+    }
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */