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After reading the Test-and-Set Wikipedia entry, I am still left with the question ‘What would a Test-and-Set be used for?’
I realize that you can use it to implement Mutex (as described in wikipedia), but what other uses does it have?
You use it any time you want to write data to memory after doing some work and make sure another thread hasn’t overwritten the destination since you started. A lot of lock/mutex-free algorithms take this form.