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SubjectRe: Linus on Linux, Apache and Threads
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> Each time an element is put on the event queue, you up the semaphore.
> Before getting the dequeue lock on the queue, the thread would down the
> semaphore.

That isnt the performance issue. The scaling issue tends to be the "wake all
/ wake one" stuff - which is hard to do well for wake one.

Alan


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