Date: Tue, 17 Jan 2006 13:11:17 -0500 From: John Baldwin <jhb@freebsd.org> To: kamalp@acm.org Cc: freebsd-hackers@freebsd.org, prime <guomingyan@gmail.com> Subject: Re: How priority propagation works on read/write lock? Message-ID: <200601171311.20570.jhb@freebsd.org> In-Reply-To: <ac7deb50601152108l15a98197v9eaeaa5a8f0e2d1e@mail.gmail.com> References: <1fa17f810601122232l25551bc5n4e4a01ff6b7921e@mail.gmail.com> <200601131422.15208.jhb@freebsd.org> <ac7deb50601152108l15a98197v9eaeaa5a8f0e2d1e@mail.gmail.com>
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On Monday 16 January 2006 00:08, Kamal R. Prasad wrote: > you mean, boosting the priority of a reader would be required to avoid > priority inversion, but difficult to implement? > > regards > -kamal > > On 1/14/06, John Baldwin <jhb@freebsd.org> wrote: > > I think you just kind of punt and do a best effort. Trying to manage a > > list > > of current read lock holders would be a bit PITA. Yes. The actual boosting is rather simple, it's keeping track of who has read locks that is ugly. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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