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Continue to ChatCreate a timer on 2nd thread using Grand Central Dispatch GCD https://www.stlplace.com/2011/06/20/create-a-timer-on-2nd-thread-using-grand-central-dispatch-gcd/
Create a timer on 2nd thread using Grand Central Dispatch GCD https://www.stlplace.com/2011/06/20/create-a-timer-on-2nd-thread-using-grand-central-dispatch-gcd/