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RunOnMainThread(waitUntilDone:=true,..) can deadlock the main-thread if called from AWT-EDT,
since the main-thread may call back to AWT-EDT while injecting a new main-thread task.
This patch revises all RunOnMainThread CALayer usage, resulting in only one required left:
- OSXUtil.AddCASublayer() w/ waitUntilDone:=false
Hence the CALayer code has no more potential to deadlock main-thread/AWT-EDT.
OSXUtil.AddCASublayer() must be performed on main-thread, otherwise the
CALayer attachment will fail - no visible rendering result.
+++
Note: A good trigger to test this deadlock is to magnify/zoom
the OSX desktop (click background + ctrl-mouse_wheel)
before running some unit tests.
TestGLCanvasAWTActionDeadlock01AWT and TestAddRemove02GLWindowNewtCanvasAWT
also have the potential to trigger the mentioned deadlock.
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main-thread deadlock'ed due to locked shared context
NSOpenGLLayer::openGLContextForPixelFormat(..) is performed on main-thread at 1st NSOpenGLLayer display method.
This happened irregulary, i.e. sometimes (T0) right after NSOpenGLLayer creation and attachSurfaceLayer()/AddCASublayer(..),
sometimes later (T1).
NSOpenGLLayer::openGLContextForPixelFormat(..) uses the passed shared user context.
The shared user context is locked at NSOpenGLLayer's creation (T0) and if performed at this early time
the call deadlocks due to pthread_mutex wait for the shared user context.
This fix performs NSOpenGLLayer creation and layer attachment while the shared user context
is kept unlocked and enforces NSOpenGLLayer display and hence NSOpenGLLayer::openGLContextForPixelFormat(..).
Added CGL.setNSOpenGLLayerEnabled(..) to enable/disable NSOpenGLLayer - currently not used.
- Passed AddRemove tests for GLCanvas/Swing and GLWindow/NewtCanvasAWT w/ 100 loops on Java6 and Java7 on OSX.
- Passed Instruments Leaks test w/ 10 loops on Java6 and Java7
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'CGL.releaseNSOpenGLLayer' triggers release - but very late w/ AWT usage.
OSXUtil_RemoveCASublayer0's added '[subLayer release]' in commit f6e6fab2a7ddfb5c9b614cb072c27ff697629161
is wrong, since 'CGL.releaseNSOpenGLLayer' actually does trigger it's release.
This was not seen w/ AWT tests, since it happens very later.
A NewtCanvasAWT test disclosed this error -> removed that extra release call.
The culprit for the late release w/ AWT usage was CGL.createNSOpenGLLayer's call in the current thread.
Moving it to the Main-Thread fixed the problem.
All CALayer lifecycle calls are issued on the Main-Thread now.
NSOpenGLLayer's CVDisplayLink OpenGL fitting via 'CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext'
is now performed at it's context creation in 'NSOpenGLLayer::openGLContextForPixelFormat'.
The 'extra' release of the NSOpenGLLayer's NSOpenGLContext as introduced in commit f6e6fab2a7ddfb5c9b614cb072c27ff697629161
is still valid.
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