Multiple locks on web thread not allowed! Please file a bug. Crashing now

objective-c nsurlconnection nsrunloop
Starbax picture Starbax · Nov 7, 2011 · Viewed 9.5k times · Source

i make a url-Request and waiting for the answer with

I start the request, then waiting until synchronousOperationComplete=TRUE

NSRunLoop *theRL = [NSRunLoop currentRunLoop];

while (!synchronousOperationComplete && [theRL runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]]);

then I return the response

all seems to be ok,i get the response and everything is working normal, but when I close the app i get:

bool _WebTryThreadLock(bool), 0x227f40: Multiple locks on web thread not allowed! Please file a bug. Crashing now...

1   _ZL17_WebTryThreadLockb
2   _ZL14WebRunLoopLockP19__CFRunLoopObservermPv
3   __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__
4   __CFRunLoopDoObservers
5   __CFRunLoopRun
6   CFRunLoopRunSpecific
7   CFRunLoopRunInMode
8   _ZL12RunWebThreadPv
9   _pthread_start
10  thread_start

it seems to be the NSRunLoop what causes the error, when I commend it out the error doesn't appear.

I use IOS 5.0 does someone have a clue what I can do to avoid this error?

i used this in IOS 4.3 and IOS5 Beta and it works fine.

but i moved my tomcat6 to an other server, maybe it is an error of the server

THX mBax

Answer

auco picture auco · May 19, 2012

I just had the same error message, but I tried to call a stringByEvaluatingJavaScript on a webView that wasn't on screen.

In general this message hints that something is trying to access an item (UIWebView) while the particular thread of this item is locked.

Related questions

iOS dispatch_async and NSURLConnection delegate functions not being called

I've edited this post to make it simpler to read, I think. I need to call an NSUrlConnection after I've finished doing some intensive string manipulation in a dispatch_async block. The URL I call has got .htaccess authentication on …

Read More
Sending an HTTP POST request on iOS

I'm trying to send an HTTP Post with the iOS application that I'm developing but the push never reaches the server although I do get a code 200 as response (from the urlconnection). I never get a response from the server …

Read More
NSURLConnection and Basic HTTP Authentication in iOS

I need to invoke an initial GET HTTP request with Basic Authentication. This would be the first time the request is sent to the server and I already have the username & password so there's no need for a challenge …

Read More