Hi,
I am experiencing some problems with the different threading modes,
particular when starting an app or closing one or all windows of a
viewer. For my testing I am using "osgcamera -2 cow.osg" with the
several flags for the threading mode (-s, -g, -c, -d):
Here are my observations:
+ when in SingleThreaded mode I can close all windows, but the app did
not terminate (_done is always false), I get some warnings in the
console: "Warning: GraphicsWindow not realized, cannot do makeCurrent."
+ when in DrawThreadPerContext-mode I get a deadlock when closing one
window.
Here are the stack-traces of the threads:
Thread 1:
#2 0x000b3f83 in OpenThreads::Thread::YieldCurrentThread at
PThread.c++:876
#3 0x010a40e9 in osg::OperationsThread::cancel at GraphicsThread.cpp:126
#4 0x010a1254 in osg::GraphicsContext::setGraphicsThread at
GraphicsContext.cpp:321
#5 0x010a2aea in osg::GraphicsContext::close at GraphicsContext.cpp:186
#6 0x204b1818 in osgViewer::GraphicsWindowCarbon::checkEvents at
GraphicsWindowCarbon.cpp:1163
#7 0x204ab2b0 in osgViewer::Viewer::eventTraversal at Viewer.cpp:1777
#8 0x204af5eb in osgViewer::Viewer::frame at Viewer.cpp:1698
#9 0x000046f5 in main at osgcamera.cpp:326
Thread 2-7:
#2 0x000b4dd9 in OpenThreads::Mutex::lock at PThreadMutex.c++:122
#3 0x204bf096 in
OpenThreads::ScopedLock<OpenThreads::Mutex>::ScopedLock at ScopedLock:31
#4 0x204dd1d4 in ViewerDoubleBufferedRenderingOperation::draw at
Viewer.cpp:368
#5 0x204ddaa4 in ViewerDoubleBufferedRenderingOperation::operator()
at Viewer.cpp:556
#6 0x010a19f6 in osg::GraphicsContext::runOperations at
GraphicsContext.cpp:426
#7 0x204d55fc in ViewerRunOperations::operator() at Viewer.cpp:986
#8 0x010a445b in osg::OperationsThread::run at GraphicsThread.cpp:290
#9 0x000b51b0 in OpenThreads::ThreadPrivateActions::StartThread at
PThread.c++:158
+when in CullThreadPerCameraDrawThreadPerContext-mode, all the windows
are created but no rendering is visible, instead the app is locked:
Thread 1:
#2 0x000b4478 in OpenThreads::Barrier::block at PThreadBarrier.c++:182
#3 0x204aeb1f in osgViewer::Viewer::renderingTraversals at
Viewer.cpp:2149
#4 0x204af60f in osgViewer::Viewer::frame at Viewer.cpp:1700
#5 0x000046f5 in main at osgcamera.cpp:326
Thread 2-7:
#0 0x90025027 in semaphore_wait_signal_trap
#1 0x90029014 in pthread_cond_wait
#2 0x000b4478 in OpenThreads::Barrier::block at PThreadBarrier.c++:182
#3 0x010a3d9e in osg::BarrierOperation::operator() at
GraphicsThread.cpp:339
#4 0x010a445b in osg::OperationsThread::run at GraphicsThread.cpp:290
#5 0x000b51b0 in OpenThreads::ThreadPrivateActions::StartThread at
PThread.c++:158
#6 0x90024987 in _pthread_body
Thread 8-12:
#2 0x000b4dd9 in OpenThreads::Mutex::lock at PThreadMutex.c++:122
#3 0x204bf096 in
OpenThreads::ScopedLock<OpenThreads::Mutex>::ScopedLock at ScopedLock:31
#4 0x204dd1d4 in ViewerDoubleBufferedRenderingOperation::draw at
Viewer.cpp:368
#5 0x204ddaa4 in ViewerDoubleBufferedRenderingOperation::operator()
at Viewer.cpp:556
#6 0x010a19f6 in osg::GraphicsContext::runOperations at
GraphicsContext.cpp:426
#7 0x204d55fc in ViewerRunOperations::operator() at Viewer.cpp:986
#8 0x010a445b in osg::OperationsThread::run at GraphicsThread.cpp:290
#9 0x000b51b0 in OpenThreads::ThreadPrivateActions::StartThread at
PThread.c++:158
#10 0x90024987 in _pthread_body
+ when in CullDrawThreadPerContext-mode everything is ok.
I did check the GraphicsWindowCarbon-implementation aginst the others,
but could not spot any differences when closing a window.
Does osgcamera work on other platforms when closing one or all
rendering-windows? (For this I modified the dimensions and placement of
the 6 windows, so I can click the close-box of the window)
I did my tests on a MacBookPro with a CoreDuo and a single display on
Mac OS X 10.4.9
Stephan
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