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Using a Lock to Get Multiple Ovens in Use
A lock is a mechanism by which you forbid only one chef can access the oven at a time something like that and then semaphores allow you to do what multiple ovens that's not a bad idea. In practice in terms of bugs per line up per a thousand lines of code this is an area where everything is worse. all kinds of ordering of operations that could result in the assignment of those variables so you have to anticipate all possible orderings.