Date: Tue, 9 Jul 1996 10:22:24 +0900 (JST) From: Michael Hancock <michaelh@cet.co.jp> To: "Ron G. Minnich" <rminnich@Sarnoff.COM> Cc: hackers@freebsd.org Subject: Re: filemalloc etc. for shared memory between processes Message-ID: <Pine.SV4.3.93.960709101710.18765C-100000@parkplace.cet.co.jp> In-Reply-To: <Pine.SUN.3.91.960708091005.18917F-100000@terra>
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On Mon, 8 Jul 1996, Ron G. Minnich wrote: > > I wonder how one should properly implement locking of memory > > regions in this case. Will appropriate fcntl(2) be > > enough? > > no, you use the fastlock() i posted earlier. fcntl is probably the worst > way there is to lock shared regions. You want memory-value-based locking > so you can use compare-and-swap (or equivalent). I read in the New Frontiers book about 4.4bsd semaphores; something like mset and mclear, but I didn't see any mention of this in the 4.4 deamon book. Does the pthreads lib have facilities for locking data structures in shared memory? -mike
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