Re: Atomic operations (Was Re: Living With Old Baggage)

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Article #11549

#11549

From: Andy Glew
Date: Mon, 13 May 1991 09:29

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>Once you've created a lock (with xmem) you can do almost anything within the
>locked region of code without disabling interrupts.

Including being preempted, leaving all the other processors spinning
for a lock held by a process which is swapped out.

Gang scheduling is only half a solution.

In my synchronization survey I call this the "spinning on a
non-running processor" problem.  So far, only the i860 has a general
solution to this problem, with its operation that blocks interrupts
for a short length of time from user mode.

--

Andy Glew, glew@ichips.intel.com
Intel Corp., M/S JF1-19, 5200 NE Elam Young Parkway, 
Hillsboro, Oregon 97124-6497

This is a private posting; it does not indicate opinions or positions
of Intel Corp.

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From: glew@pdx007.intel.com (Andy Glew)
Newsgroups: comp.arch
Subject: Re: Atomic operations (Was Re: Living With Old Baggage)
Message-ID: <GLEW.91May13102912@pdx007.intel.com>
Date: 13 May 91 09:29:12 GMT
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In-Reply-To: kenton@abyss.zk3.dec.com's message of 6 May 91 11:31:49 GMT

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