Date: Thu, 11 Nov 1999 12:49:41 -0500 (EST) From: Daniel Eischen <eischen@vigrid.com> To: Michael Schuster - TSC SunOS Germany <michael.schuster@germany.sun.com> Cc: "freebsd-arch@FreeBSD.ORG" <freebsd-arch@freebsd.org> Subject: Re: Threads goals and implementation Message-ID: <Pine.SUN.3.91.991111122739.24392A-100000@pcnet1.pcnet.com> In-Reply-To: <382ABB1A.CB959F01@germany.sun.com>
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On Thu, 11 Nov 1999, Michael Schuster - TSC SunOS Germany wrote: > > 5/ All threads in a process share the same system resources. > > IMO, this is a contradiction to 13/ and 9/ Perhaps 5 and 13 should be combined into one. > > 6/ (contentious) Multiple theads should be bound to within the resource > > limits of the single process (see also 13) > > This is implied by 5/ (I see resource limits as "resource" as well - > "meta" resource, if you will). OK > > 9/ There exists a set of primatives that allow threads to influence the > > in-process scheduling between themselves. > > 9A/ e.g. 'per thread' Thread scheduling classes. > > scheduling class is an attribute of a thread, therefore a resource -> > ergo contradiction to 5/ & 6/ This doesn't have to imply scheduling across all threads in the system. It does state "in-process" scheduling, so I don't think that 9A is meant to include system scheduling classes. > > 10/ Quick access to curthread and thread specific data. > > see my suggestion to 5/ below; otherwise, this belongs to implementation > issues ("quick access"). > > > 11/ A method to ask a thread blocked in the kernel to wake up and back > > out (similar to present 'signals'). > > > > 12/ Processorr affinity for threads. > > > > 13/ Ability to create thread groups that can be assigned separate system > > resource limits (e.g. priority, quantum). > > see my comment to 6/ > > my suggestion: > > 5/ All threads in a process share the same resources by default with > the following possible exceptions > 5a/ the (limits for) the following resources can be set on a > per-thread basis: priority, quantum, scheduling class.. (your favourite > here) > 5b/ thread-specific data such as curthread, thread stack, etc. > > and do away with 6/, 9/, 10/ and 13/ Makes sense to me, though I think that "quick access to TSD and current thread" is a goal. Dan Eischen eischen@vigrid.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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