Date: Wed, 12 May 1999 12:47:21 -0700 (PDT) From: Doug White <dwhite@resnet.uoregon.edu> To: Rahul Dhesi <dhesi@rahul.net> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: looking for test-and-set or atomic swap instruction Message-ID: <Pine.BSF.4.03.9905121247130.23756-100000@resnet.uoregon.edu> In-Reply-To: <199905062251.AA19855@bolero-x.rahul.net>
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On Thu, 6 May 1999, Rahul Dhesi wrote: > I am looking for a machine instruction that could be used to implement > mutual exclusion in software, similar to the traditional test-and-set or > atomic swap instructions, and some way of invoking it from within C code > from within FreeBSD 3.x. Any suggestions? More info below. > > I don't expect to be using a multiprocessing system, so perhaps that > should make things easier. > > I can't use any lock that requires a system call. I am making accesses > to common shared memory from multiple processes, and a system call would > be too costly. The rate of shared memory access will be high but > conflicts will be very rare, so a spin lock will do just fine. Pthreads? Doug White Internet: dwhite@resnet.uoregon.edu | FreeBSD: The Power to Serve http://gladstone.uoregon.edu/~dwhite | www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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