As i understood, the threads provided by GCD do have a runloop but no source/port. Now i use some of methods that call AppleScripts thru AppleEvents inside an NSOperationQueue. And sometimes my app crashes with following stacktrace.

my questions:

• Usage of AppleScript inside a NSInvocationOperation or NSBlockOperation
• Usage of AppleEvents inside GCD-Threads
• do i have to add a source / port to a runloop of a gcd-thread before using AppleEvents?
• do i have to add a source / port to a runloop of a gcd-thread before using [CATransaction commit]?
• do i have to add a source / port to a runloop of a gcd-thread before using [NSObject performSelectorAfterDelay...] ?
• if yes, how?
• can i simply call CFRunLoopRunInMode(kCFRunLoopDefaultMode, 5.0, false); /// or 30 or the defined timeout of appleevent?

..

Thread 9: Dispatch queue: com.apple.root.default-priority
0 libSystem.B.dylib 0x00007fff88276e82 semaphore_wait_signal_trap 10
1 libSystem.B.dylib 0x00007fff8827c3cd pthread_mutex_lock 469
2 com.apple.applescript 0x000000011d3d461f AppleScriptComponent 50
3 com.apple.applescript 0x000000011d3edbcc AGenericCall::Delegate(ComponentInstanceRecord*) 46
4 com.apple.applescript 0x000000011d3ed520 AGenericManager::HandleOSACall(ComponentParameters*) 54
5 com.apple.applescript 0x000000011d3ed4b0 GenericComponent 219
6 com.apple.openscripting 0x00007fff8381c6da OSAExecuteEvent 63
7 com.apple.Foundation 0x00007fff86f320d8 -[NSAppleScript(NSPrivate) _executeAppleEvent:withMode:error:] 161
8 xxx 0x0000000100048af0 -[TCallScript callScript:withArrayOfParameters:] 480
9 xxx 0x0000000100048ffd -[TCallScript callHandler:withParameters:] 477
10 xxx 0x0000000100036032 -[ZFOpenWindowController getSafariItemForCurrentTabForWindow:] 66
11 xxx 0x00000001000346af -[ZFOpenWindowController refreshWindowList:] 1679
12 xxx 0x000000010003541c -[ZFOpenWindowController bringZFToForegroundZoomOut:orJustLinkFrontMost:toItem:] 2988
13 xxx 0x0000000100053556 __-[ZFSelectionTool openWithPreferredApplication:]_block_invoke_516 54
14 com.apple.Foundation 0x00007fff86ed87d9 -[NSBlockOperation main] 140
15 com.apple.Foundation 0x00007fff86ec906d -[__NSOperationInternal start] 681
16 com.apple.Foundation 0x00007fff86ec8d23 ____startOperations_block_invoke_2 99
17 libSystem.B.dylib 0x00007fff882b2ce8 _dispatch_call_block_and_release 15
18 libSystem.B.dylib 0x00007fff88291279 _dispatch_worker_thread2 231
19 libSystem.B.dylib 0x00007fff88290bb8 _pthread_wqthread 353
20 libSystem.B.dylib 0x00007fff88290a55 start_wqthread 13


...


Thread 11 Crashed: Dispatch queue: com.apple.root.default-priority
0 com.apple.applescript 0x000000011d40f658 BCHandleError() 182
1 com.apple.applescript 0x000000011d4059ca UASExecute1() 2546
2 com.apple.applescript 0x000000011d3dd1d5 ASExecuteEvent(AEDesc const*, unsigned int, int, unsigned int*) 695
3 ...ple.CoreServices.CarbonCore    0x00007fff85388e04 CallComponentFunction 28
4 com.apple.applescript 0x000000011d3d4cad AppleScriptComponent 1728
5 com.apple.applescript 0x000000011d3edbcc AGenericCall::Delegate(ComponentInstanceRecord*) 46
6 com.apple.applescript 0x000000011d3ed520 AGenericManager::HandleOSACall(ComponentParameters*) 54
7 com.apple.applescript 0x000000011d3ed4b0 GenericComponent 219
8 com.apple.openscripting 0x00007fff8381c6da OSAExecuteEvent 63
9 com.apple.Foundation 0x00007fff86f320d8 -[NSAppleScript(NSPrivate) _executeAppleEvent:withMode:error:] 161
10 xxx 0x0000000100048af0 -[TCallScript callScript:withArrayOfParameters:] 480
11 xxx 0x0000000100048ffd -[TCallScript callHandler:withParameters:] 477
12 xxx 0x0000000100035c67 -[ZFOpenWindowController getItemForAXDocumentOfFrontMostWindow] 119
13 xxx 0x00000001000359f1 -[ZFOpenWindowController getItemForFrontMostWindow:] 721
14 xxx 0x00000001000348ac -[ZFOpenWindowController bringZFToForegroundZoomOut:orJustLinkFrontMost:toItem:] 60
15 xxx 0x0000000100053556 __-[ZFSelectionTool openWithPreferredApplication:]_block_invoke_516 54
16 com.apple.Foundation 0x00007fff86ed87d9 -[NSBlockOperation main] 140
17 com.apple.Foundation 0x00007fff86ec906d -[__NSOperationInternal start] 681
18 com.apple.Foundation 0x00007fff86ec8d23 ____startOperations_block_invoke_2 99
19 libSystem.B.dylib 0x00007fff882b2ce8 _dispatch_call_block_and_release 15
20 libSystem.B.dylib 0x00007fff88291279 _dispatch_worker_thread2 231
21 libSystem.B.dylib 0x00007fff88290bb8 _pthread_wqthread 353
22 libSystem.B.dylib 0x00007fff88290a55 start_wqthread 13