fix the data race about 'readyState' #582
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set the property
readyState
in the_workQueue
thread.get property
readyState
some in main thread, and some in the same thread where set.So it causes data racing,when set in
_workQueue
thread and get in main thread.I met several times in
- (void)open
.So change the geting in
_workQueue
thread.