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  • It should definitively do the job, but the second thread will have to wait for a mutex each time it wants to synchronise the shared object, even after the signal has been sent (and taken into account). What about a State/Strategy DP: the initial state consists in checking the shared object, and to switch to the second state as soon as the signal has been sent. The second state consists in "behave an other way" without checking the shared object. Commented Jul 15, 2016 at 7:40