Date: Fri, 5 Feb 2016 10:58:35 +0100 From: u-uy74@...ey.se To: musl@...ts.openwall.com Subject: Re: setcontext/getcontext/makecontext missing? On Thu, Feb 04, 2016 at 02:24:03PM -0500, Rich Felker wrote: > > Pthreads feels like an overkill, hardly efficient when all one needs > > is cooperative threading designed from the beginning to fit in one > > process. > the comparison is not between pure-userspace switching and having the > kernel involved, but between a SYS_rt_sigprocmask syscall and a > voluntary context switch between threads in the same process. The > latter is extremely light and comparable to some of the cheapest > syscalls, so I suspect the performance difference between ucontext and > threads is negligible. Thanks for pointing this out, if rt_sigprocmask can not be skipped then indeed a switch becomes much more expensive. > Given that there are a lot of other good > reasons you should be using threads instead of ucontext, I think the > matter is pretty clear. Sure, the API was not exactly well thought-out. Still I'd like to have a lighweight choice when it is enough. This is of course offtopic for musl, given that there is no reasonable standard/specification for the purpose. Regards, Rune
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