ios - How to find conflicting thread in frozen UI -


i having ui frozen/blocked due semaphore_wait_trap in main thread.

when ui frozen, pause using xcode , last 2 lines in stacktrace:

0x103f0ea30 <+809>:  callq  0x103f1554d               ; _dispatch_thread_semaphore_wait  dispatch_sync(somequeue, block);  // code.

how can find causing block?

any other suggestion find out causing block?

it blocks on same line/code.

in debug navigator (cmd-6), should have list of threads. 1 other thread in there should waiting somequeue well. can't think off hand of case wasn't case. 2 threads waiting each other, (e.g. via dispatch_sync).

for example, might have this:

dispatch_sync(myserialqueue, ^{     [self foo]; });

and

- (void)foo {     dispatch_sync(myserialqueue, ^{         ...     }); }

the latter waiting former finish forever, because former holding onto myqueue until finishes call -foo.

(note myserialqueue has created dispatch_queue_serial happen.)


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