Update async.md #1473
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Update async.md #1473
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In multithreaded implementations, status_ needs to be updated before instructions that lead to CallData being put back into the completion queue. Otherwise, a race condition can occur where thread_1 picks up a Call Data instance that is intended to execute the current state (i.e. FINISH) but instead executes the previous state (i.e. PROCESS) because the status was not updated yet by thread_2.