我遇到了一个奇怪的问题：在applicationDidFinishLaunching的{{1}}中初始化了一个单例，但在某些情况下我会收到AppDelegate的崩溃报告（EXC_CRASH ）和这样的堆栈跟踪：
SIGSEGV所以我看到我的单身人士正在尝试分配并失败，所以我认为0 com.name.myapp 0x000000010f723bae -[MySingleton .cxx_construct] (common_bootstrap.h:57)
1 libobjc.A.dylib 0x00007fff91339baa object_cxxConstructFromClass(objc_object*, objc_class*) + 151
2 libobjc.A.dylib 0x00007fff913367e4 object_cxxConstruct + 25
3 libobjc.A.dylib 0x00007fff91336795 _objc_constructOrFree + 21
4 libobjc.A.dylib 0x00007fff9134a49d +[NSObject allocWithZone:] + 16
5 com.name.myapp 0x000000010f722a11 __32+[MySingleton sharedInstance]_block_invoke (MySingleton.mm:124)
6 libdispatch.dylib 0x00007fff9377a2ad _dispatch_client_callout + 8
7 libdispatch.dylib 0x00007fff9377a21c dispatch_once_f + 79
8 com.name.myapp 0x000000010f7229f5 +[MySingleton sharedInstance] (once.h:68)
9 com.name.myapp 0x000000010f719480 -[AppDelegate applicationShouldTerminate:] (AppDelegate.m:673)
10 com.apple.AppKit 0x00007fff8d017471 -[NSApplication _docController:shouldTerminate:] + 69
11 com.apple.AppKit 0x00007fff8d017383 __91-[NSDocumentController(NSInternal) _closeAllDocumentsWithDelegate:shouldTerminateSelector:]_block_invoke + 152
12 com.apple.AppKit 0x00007fff8d017122 -[NSDocumentController(NSInternal) _closeAllDocumentsWithDelegate:shouldTerminateSelector:] + 1292
13 com.apple.AppKit 0x00007fff8d016bbf -[NSDocumentController(NSInternal) __closeAllDocumentsWithDelegate:shouldTerminateSelector:] + 265
14 com.apple.AppKit 0x00007fff8d01688c -[NSApplication _shouldTerminate] + 663
15 com.apple.AppKit 0x00007fff8d052a34 -[NSApplication(NSAppleEventHandling) _handleAEQuit] + 357
16 com.apple.AppKit 0x00007fff8ccb7213 -[NSApplication(NSAppleEventHandling) _handleCoreEvent:withReplyEvent:] + 282
17 com.apple.Foundation 0x00007fff92bf1eaa -[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 294
18 com.apple.Foundation 0x00007fff92bf1d1d _NSAppleEventManagerGenericHandler + 106
19 com.apple.AE 0x00007fff8c139e1f aeDispatchAppleEvent(AEDesc const*, AEDesc*, unsigned int, unsigned char*) + 381
20 com.apple.AE 0x00007fff8c139c32 dispatchEventAndSendReply(AEDesc const*, AEDesc*) + 31
21 com.apple.AE 0x00007fff8c139b36 aeProcessAppleEvent + 315
22 com.apple.HIToolbox 0x00007fff8bced5f1 AEProcessAppleEvent + 56
23 com.apple.AppKit 0x00007fff8ccb30f6 _DPSNextEvent + 1026
24 com.apple.AppKit 0x00007fff8ccb28db -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122
25 com.apple.AppKit 0x00007fff8cca69cc -[NSApplication run] + 553
26 com.apple.AppKit 0x00007fff8cc91803 NSApplicationMain + 940
27 com.name.myapp 0x000000010f716ec4 start + 52
从未被调用过。
为什么OS X会在启动之前尝试终止我的应用程序？