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copied!<p>Following on from Gwynne Raskind answer you can avoid the CFRunLoop exception handler by using GCD to dispatch a call to a block of C++ code synchronously:</p> <pre><code>namespace { void MyThrowingCode() { throw std::runtime_error("My Exception"); } } - (void)objcHandlerCalledFromARunLoop { dispatch_sync(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{ MyThrowingCode(); }); } </code></pre> <p>You might need to create your own queues rather than using a single shared queue.</p> <p>The crash log looks like this:</p> <pre><code>0 libsystem_kernel.dylib 0x3aa39350 __pthread_kill + 8 1 libsystem_c.dylib 0x3a9affb2 pthread_kill + 54 2 libsystem_c.dylib 0x3a9ec366 abort + 90 3 libc++abi.dylib 0x39f94dda abort_message + 70 4 libc++abi.dylib 0x39f92094 default_terminate() + 20 5 libobjc.A.dylib 0x3a545a70 _objc_terminate() + 168 6 libc++abi.dylib 0x39f92118 safe_handler_caller(void (*)()) + 76 7 libc++abi.dylib 0x39f921b0 std::terminate() + 16 8 libc++abi.dylib 0x39f9359a __cxa_throw + 118 9 Test 0x000fddfc MyThrowingCode() (MainViewController.mm:177) 10 Test 0x000fe38c __35-[MainViewController toolsClick:]_block_invoke (MainViewController.mm:184) 11 libdispatch.dylib 0x3a95f5d8 _dispatch_client_callout + 20 12 libdispatch.dylib 0x3a962776 _dispatch_sync_f_invoke + 22 13 Test 0x000fde90 -[MainViewController toolsClick:] (MainViewController.mm:183) 14 UIKit 0x34744082 -[UIApplication sendAction:to:from:forEvent:] + 66 15 UIKit 0x3474410c -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 116 16 UIKit 0x34744082 -[UIApplication sendAction:to:from:forEvent:] + 66 17 UIKit 0x34744036 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 26 18 UIKit 0x34744010 -[UIControl sendAction:to:forEvent:] + 40 19 UIKit 0x347438c6 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 498 20 UIKit 0x34743db4 -[UIControl touchesEnded:withEvent:] + 484 21 UIKit 0x3466c5f4 -[UIWindow _sendTouchesForEvent:] + 520 22 UIKit 0x346598dc -[UIApplication sendEvent:] + 376 23 UIKit 0x346591ea _UIApplicationHandleEvent + 6194 24 GraphicsServices 0x363715f4 _PurpleEventCallback + 588 25 GraphicsServices 0x36371222 PurpleEventCallback + 30 26 CoreFoundation 0x3281f3e4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 32 27 CoreFoundation 0x3281f386 __CFRunLoopDoSource1 + 134 28 CoreFoundation 0x3281e20a __CFRunLoopRun + 1378 29 CoreFoundation 0x32791238 CFRunLoopRunSpecific + 352 30 CoreFoundation 0x327910c4 CFRunLoopRunInMode + 100 31 GraphicsServices 0x36370336 GSEventRunModal + 70 32 UIKit 0x346ad2b4 UIApplicationMain + 1116 33 Test 0x00120462 main (main.mm:55) 34 libdyld.dylib 0x3a972b1c start + 0 </code></pre>

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