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psobot
on Dec 29, 2012
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It's "locking" if it's blocking
You don't need to be embedded to have performance matter - even if your OS gives you concurrency primitives, there are many situations where jumping into kernel code is still "too expensive."
justincormack
on Dec 29, 2012
[–]
That's why Linux has the futex which is userspace only if not contended only jumps to kernel code for the contended case.
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