Date: Sat, 23 Apr 2005 04:49:32 +0000 From: "Jas arlerr" <jas_arlerr@hotmail.com> To: julian@elischer.org, dleimbac@gmail.com Cc: freebsd-hackers@freebsd.org Subject: Re: libthread 1:1 threads Message-ID: <BAY2-F37F0FB21CECB0A135004F4F22E0@phx.gbl> In-Reply-To: <426953C5.9080502@elischer.org>
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> >KSE and 1:1 threading are different things. >One creatres kernel threads on demand and the other keeps the kernel >threads all the time the user thread exists. > >rfork is not the same.. it creates a new process context. that is >what Linux does. >it is also what we did before when running the the linuxthreads >package. > >KSE and 1:1 use a lot of the same kernel changes and entities. >Which one survives will be judged in time. > > >there has been a 1:1 and an M:N library since 5.2 > Yes. As Julian said, libthread is a 1:1 model, while libkse(now libpthread) is an M:N model. KSE is very interesting, it originates from Anderson's Scheduler Activation. But it solved some problems existed in the SA. IMHO, libkse lacks supports for real-time applications (also due to the nonpreemptive kernel feature). BTW, anybody familar with Linux NPTL (1:1 thread model)? Can libthread take some ideas from it? Regards Jas _________________________________________________________________ 与世界各地的朋友进行交流，免费下载 MSN Messenger: http://messenger.msn.com/cn
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