Date: Thu, 5 Dec 1996 10:59:01 -0700 From: vanmaren@fast.cs.utah.edu (Kevin Van Maren) To: smp@csn.net, vanmaren@fast.cs.utah.edu Cc: ccsanady@friley216.res.iastate.edu, peter@spinner.dialix.com, smp@freebsd.org Subject: Re: make locking more generic? Message-ID: <199612051759.KAA19283@fast.cs.utah.edu>
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My thinking was mainly that the drivers have never been tested in this environment. If you have a driver that is used for two devices, and you allow both to generate interrupts and have the driver executing on two processors simultaneously, the shared data structures are not going to be protected. So the simple fix would be to put a lock around each driver. But you will still have problems with other shared data structures; the same problem with allowing multiple processes to make kernel calls. This is all part of the enormous problem of adding fine-grained locking to an existing single-threaded kernel. Kevin
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