我的app委托的几个地方（applicationWillEnterForeground，didReceiveRemoteNotification）中有以下代码。
//create the semaphore
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
/* ... redacted code that does some other stuff ... */
// Wait up to 30 seconds for reauth
int ntimeout = 3;
//holds the thread until the dispatch_semaphore_signal(semaphore); is send
while ((dispatch_semaphore_wait(semaphore, DISPATCH_TIME_NOW)) && ( ntimeout > 0 ))
{
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate dateWithTimeIntervalSinceNow:10]];
ntimeout --;
}
问题是我们偶尔会在[[NSRunLoop currentRunLoop] runMode行上遇到以下情况崩溃：
Fatal Exception: NSInternalInconsistencyException
0 CoreFoundation 0x181f5edb0 __exceptionPreprocess
1 libobjc.A.dylib 0x1815c3f80 objc_exception_throw
2 CoreFoundation 0x181f5ec80 +[NSException raise:format:]
3 Foundation 0x1828e41c0 -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:]
4 UIKit 0x187380984 _prepareForCAFlush
5 UIKit 0x187380820 __84-[UIApplication _handleApplicationActivationWithScene:transitionContext:completion:]_block_invoke_2
6 CoreFoundation 0x181f14f84 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__
7 CoreFoundation 0x181f148bc __CFRunLoopDoBlocks
8 CoreFoundation 0x181f12820 __CFRunLoopRun
9 CoreFoundation 0x181e3cc50 CFRunLoopRunSpecific
10 Foundation 0x18284ccfc -[NSRunLoop(NSRunLoop) runMode:beforeDate:]
有谁知道为什么会这样？
提前致谢，