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Re:Re: 100k Threads? (2002) by gpderetta on Saturday September 23, 2023 @11:19AM (#37624049)
Userspace IO is a thing though.

Even with traditional kernel side IO, you might not want to attempt a syscall if the socket is known not to be ready.

Also when implementing purely userspace synchronization primitives, being able to swap to a different context purely in userspace is nice.

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