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sync operations: where's the barrier?

From: Geoffrey Keating <geoffk at apple dot com>
To: Richard Henderson <rth at redhat dot com>, GCC Mailing List <gcc at gcc dot gnu dot org>
Date: Mon, 18 Apr 2005 14:48:27 -0700
Subject: sync operations: where's the barrier?

Hi Richard,

The documentation for the atomic operation patterns says things like:

This pattern must issue any memory barrier instructions such that the
pattern as a whole acts as a full barrier.

Should the barrier happen before the operation, after the operation, are there two barriers, or is it undefined?

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Follow-Ups:
- Re: sync operations: where's the barrier?
  - From: David Edelsohn
- Re: sync operations: where's the barrier?
  - From: Richard Henderson

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