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POhow do I debug a wait_fences error
 

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  1. POhow do I debug a wait_fences error
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    <p>wait_fences: failed to receive reply: 10004003</p> <p>I continue to get this error. It happens when my app starts up. How would I debug this issue. Is there some way I can watch the wait_fences and see what is going on there. Is there some way to see what threads are blocking what ? </p> <p>It feels like this error is nothing but a theading black hole with no tools or info getting into or coming out of the void. </p> <p>Anyone with tips on debugging this error would be greatly appreciated.</p> <p><strong>New</strong></p> <p>I have now changed my threading, All threading calls go through this method set to do all their dispatches</p> <p><strong>NOTE:</strong> Also I wish you guys would not vote to close my question just because you have seen another question about this problem. There is no real information about this error. I need to know what causes this error and/or how to debug it. not the common "add the super calls to your viewDidAppear and the such. If those helped, I would not have asked this question.</p> <pre><code>+ (void) ensureDispatchOfBlock:(dispatch_block_t) block onQueue:(dispatch_queue_t) queue async:(BOOL) async{ if (dispatch_get_current_queue() == queue){ block(); } else { if (async){ dispatch_async(queue, block); } else { dispatch_sync(queue, block); } } } + (void) ensureDispatchOnMainThread:(dispatch_block_t) block async:(BOOL) async{ [self ensureDispatchOfBlock:block onQueue:dispatch_get_main_queue() async:async]; } + (BOOL) addBlock:(dispatch_block_t) block toQueue:(dispatch_queue_t) queue async:(BOOL) async { if (!async &amp;&amp; dispatch_get_current_queue() == queue){ return NO; } if (async){ dispatch_async(queue, block); } else { dispatch_sync(queue, block); } return YES; } </code></pre>
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    1. USThe Lazy Coder
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    1. COare you trying to update a UI element on a background thread?
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    2. CODid you checked http://stackoverflow.com/questions/1371346/wait-fences-failed-to-receive-reply-10004003 http://stackoverflow.com/questions/8032987/why-do-i-get-wait-fences-failed-to-receive-reply-for-this-code http://stackoverflow.com/questions/1202300/iphone-sdk-3-0-wait-fences-failed-to-receive-reply-10004003 http://stackoverflow.com/questions/4241894/wait-fences-failed-to-receive-reply-10004003-error-uialert-without-uitextfie
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    3. COI did check out all of those. I do not believe that I am doing any animations but I have two competing methods that are being dispatched on the high priority thread. I comment one or the other and I still get the error, commenting both makes the error go away. I am working on all the threading sections to convert them to check and dispatch only if needed. But I thought dispatch_async put them on the queue I expected them to run in succession.
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