pyuno/source/module/pyuno_gc.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include "pyuno_impl.hxx"
  21
  22 #include <sal/config.h>
  23
  24 #include <rtl/ref.hxx>
  25 #include <salhelper/thread.hxx>
  26
  27 namespace pyuno
  28 {
  29
  30 static bool g_destructorsOfStaticObjectsHaveBeenCalled;
  31
  32 namespace {
  33
  34 class StaticDestructorGuard
  35 {
  36 public:
  37     ~StaticDestructorGuard()
  38     {
  39         g_destructorsOfStaticObjectsHaveBeenCalled = true;
  40     }
  41 };
  42
  43 }
  44
  45 static StaticDestructorGuard guard;
  46
  47 static bool isAfterUnloadOrPy_Finalize()
  48 {
  49     return g_destructorsOfStaticObjectsHaveBeenCalled ||
  50         !Py_IsInitialized();
  51 }
  52
  53 namespace {
  54
  55 class GCThread: public salhelper::Thread {
  56 public:
  57     GCThread( PyInterpreterState *interpreter, PyObject * object );
  58
  59 private:
  60     virtual ~GCThread() override {}
  61
  62     virtual void execute() override;
  63
  64     PyObject *mPyObject;
  65     PyInterpreterState *mPyInterpreter;
  66 };
  67
  68 }
  69
  70 GCThread::GCThread( PyInterpreterState *interpreter, PyObject * object ) :
  71     Thread( "pyunoGCThread" ), mPyObject( object ),
  72     mPyInterpreter( interpreter )
  73 {}
  74
  75 void GCThread::execute()
  76 {
  77     //  otherwise we crash here, when main has been left already
  78     if( isAfterUnloadOrPy_Finalize() )
  79         return;
  80     try
  81     {
  82         PyThreadAttach g( mPyInterpreter );
  83         {
  84             Runtime runtime;
  85
  86             // remove the reference from the pythonobject2adapter map
  87             PyRef2Adapter::iterator ii =
  88                 runtime.getImpl()->cargo->mappedObjects.find( mPyObject );
  89             if( ii != runtime.getImpl()->cargo->mappedObjects.end() )
  90             {
  91                 runtime.getImpl()->cargo->mappedObjects.erase( ii );
  92             }
  93
  94             Py_XDECREF( mPyObject );
  95         }
  96     }
  97     catch( const css::uno::RuntimeException & e )
  98     {
  99         OString msg = OUStringToOString( e.Message, RTL_TEXTENCODING_ASCII_US );
 100         fprintf( stderr, "Leaking python objects bridged to UNO for reason %s\n",msg.getStr());
 101     }
 102 }
 103
 104 void decreaseRefCount( PyInterpreterState *interpreter, PyObject *object )
 105 {
 106     //  otherwise we crash in the last after main ...
 107     if( isAfterUnloadOrPy_Finalize() )
 108         return;
 109
 110     // delegate to a new thread, because there does not seem
 111     // to be a method, which tells, whether the global
 112     // interpreter lock is held or not
 113     // TODO: Look for a more efficient solution
 114     rtl::Reference< GCThread >(new GCThread(interpreter, object))->launch();
 115         //TODO: a protocol is missing how to join with the launched thread
 116         // before exit(3), to ensure the thread is no longer relying on any
 117         // infrastructure while that infrastructure is being shut down in
 118         // atexit handlers
 119 }
 120
 121 }
 122
 123 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */