It seem's JSPatch can only support DISPATCH_QUEUE_SERIAL dispatch_queue

[rqwj]

Scene I
I tried to create a DISPATCH_QUEUE_CONCURRENT dispatch_queue, multi tasks in the dispatch_queue share one JSContext, then a got a exception with message "TypeError: undefined is not an object (evaluating 'self.__c')"

Scene II
I tried to create a DISPATCH_QUEUE_SERIAL dispatch_queue. when the background tasks were running, I click a button to call another patched method. The exception above occurred, too.

The test code is in my fork branch
https://github.com/Robert-Qiu/JSPatch/tree/multitherad_test

[bang590]

Fixed, thank you!