root/OpenSceneGraph/trunk/src/osg/DeleteHandler.cpp @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13#include <osg/DeleteHandler>
14#include <osg/Notify>
15
16namespace osg
17{
18
19DeleteHandler::DeleteHandler(int numberOfFramesToRetainObjects):
20    _numFramesToRetainObjects(numberOfFramesToRetainObjects),
21    _currentFrameNumber(0)
22{
23}
24
25DeleteHandler::~DeleteHandler()
26{
27    // flushAll();
28}
29
30void DeleteHandler::flush()
31{
32    typedef std::list<const osg::Referenced*> DeletionList;
33    DeletionList deletionList;
34
35    {
36        // gather all the objects to delete whilst holding the mutex to the _objectsToDelete
37        // list, but delete the objects outside this scoped lock so that if any objects deleted
38        // unref their children then no deadlock happens.
39        OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
40        unsigned int frameNumberToClearTo = _currentFrameNumber - _numFramesToRetainObjects;
41
42        ObjectsToDeleteList::iterator itr;
43        for(itr = _objectsToDelete.begin();
44            itr != _objectsToDelete.end();
45            ++itr)
46        {
47            if (itr->first > frameNumberToClearTo) break;
48
49            deletionList.push_back(itr->second);
50
51            itr->second = 0;
52        }
53
54        _objectsToDelete.erase( _objectsToDelete.begin(), itr);
55    }
56
57    for(DeletionList::iterator ditr = deletionList.begin();
58        ditr != deletionList.end();
59        ++ditr)
60    {
61        doDelete(*ditr);
62    }
63
64}
65
66void DeleteHandler::flushAll()
67{
68    unsigned int temp_numFramesToRetainObjects = _numFramesToRetainObjects;
69    _numFramesToRetainObjects = 0;
70
71    typedef std::list<const osg::Referenced*> DeletionList;
72    DeletionList deletionList;
73
74    {
75        // gather all the objects to delete whilst holding the mutex to the _objectsToDelete
76        // list, but delete the objects outside this scoped lock so that if any objects deleted
77        // unref their children then no deadlock happens.
78        OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
79        ObjectsToDeleteList::iterator itr;
80        for(itr = _objectsToDelete.begin();
81            itr != _objectsToDelete.end();
82            ++itr)
83        {
84            deletionList.push_back(itr->second);
85            itr->second = 0;
86        }
87
88        _objectsToDelete.erase( _objectsToDelete.begin(), _objectsToDelete.end());
89    }
90
91    for(DeletionList::iterator ditr = deletionList.begin();
92        ditr != deletionList.end();
93        ++ditr)
94    {
95        doDelete(*ditr);
96    }
97
98    _numFramesToRetainObjects = temp_numFramesToRetainObjects;
99}
100
101void DeleteHandler::requestDelete(const osg::Referenced* object)
102{
103    if (_numFramesToRetainObjects==0) doDelete(object);
104    else
105    {
106        OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
107        _objectsToDelete.push_back(FrameNumberObjectPair(_currentFrameNumber,object));
108    }
109}
110
111} // end of namespace osg
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