Windows User-Mode Scheduling seems to clearly be the best version of M:N scheduling. Why isn’t it ever brought up?
Because it’s compatible with existing code. Doing a blocking syscall kicks your scheduler awake.
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So, similar to a good M:N VM, but in the kernel and knows about C syscalls? How lightweight are the threads?
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Haven’t benchmarked, but they’re the officially MS-blessed API for GHC- or Go-like use cases, so I assume they’re fast.
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Wait, someone implemented scheduler activations and it actually worked? (cf. NetBSD's attempt: so buggy they broke ABI to get rid of it.)
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It’s been in Windows for a long time.
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