[gtkada] CoreAnimation: warning, deleted thread with uncommitted CATransaction.

[Pascal]

Hello.

I've got issues with the following warning:

CoreAnimation: warning, deleted thread with uncommitted CATransaction; set CA_DEBUG_TRANSACTIONS=1 in environment to log backtraces.

And with export CA_DEBUG_TRANSACTIONS=1:

CoreAnimation: warning, deleted thread with uncommitted CATransaction; created by:
0   QuartzCore                          0x00007fff89bcf8b6 _ZN2CA11Transaction4pushEv + 318
1   QuartzCore                          0x00007fff89bea372 _ZN2CA11Transaction15ensure_implicitEv + 276
2   QuartzCore                          0x00007fff89c4497a _ZN2CA11Transaction8set_seedEj + 30
3   QuartzCore                          0x00007fff89c4494f +[CATransaction(CATransactionPrivate) generateSeed] + 56
4   AppKit                              0x00007fff908c0c0f +[NSDisplayCycle currentDisplayCycle] + 37
5   AppKit                              0x00007fff908c24e8 -[NSDisplayCycleObserver setNeedsUpdateStructuralRegions:] + 34
6   AppKit                              0x00007fff904b87e6 -[NSThemeFrame _tileTitlebarAndRedisplay:] + 123
7   AppKit                              0x00007fff904b7e5f -[NSThemeFrame _updateButtons] + 3068
8   AppKit                              0x00007fff904a4636 -[NSThemeFrame _floatTitlebarAndToolbarFromInit:] + 161
9   AppKit                              0x00007fff904a0fe9 -[NSThemeFrame initWithFrame:styleMask:owner:] + 243
10  AppKit                              0x00007fff9049df74 -[NSWindow _commonInitFrame:styleMask:backing:defer:] + 568
11  AppKit                              0x00007fff9049d657 -[NSWindow _initContent:styleMask:backing:defer:contentView:] + 1475
12  AppKit                              0x00007fff9049d08d -[NSWindow initWithContentRect:styleMask:backing:defer:] + 45
13  AppKit                              0x00007fff90692a4b -[NSWindow initWithContentRect:styleMask:backing:defer:screen:] + 68
14  libgdk-3.0.dylib                    0x0000000101296fc9 -[GdkQuartzNSWindow initWithContentRect:styleMask:backing:defer:screen:] + 153
15  libgdk-3.0.dylib                    0x00000001012a7766 _gdk_quartz_display_create_window_impl + 1318

My program is multi-threaded with no problem since I upgraded to MacOS 10.11 and XCode 7.

There are some clues on:
http://stackoverflow.com/questions/12507193/coreanimation-warning-deleted-thread-with-uncommitted-catransaction

On GTK-OSX list, I was told:
"One of the requirements of using Gtk or Quartz in a multi-threaded environment is that all GUI operations take place in the main thread and that other threads use idle events for synchronization."

I was not aware of that rule!

How to do that with GTKAda?

Do you know some examples?

Thanks, Pascal.
http://blady.pagesperso-orange.fr