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[Bug libc/17403] atomic_full_barrier is incorrect for x86 and x86_64
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 23 Jun 2015 17:22:13 +0000
- Subject: [Bug libc/17403] atomic_full_barrier is incorrect for x86 and x86_64
- Auto-submitted: auto-generated
- References: <bug-17403-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=17403
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c47ca9647f9b72692e62f94fe468cd5568f49129
commit c47ca9647f9b72692e62f94fe468cd5568f49129
Author: Torvald Riegel <triegel@redhat.com>
Date: Wed Oct 29 10:34:36 2014 +0100
Fix atomic_full_barrier on x86 and x86_64.
This fixes BZ #17403 by defining atomic_full_barrier,
atomic_read_barrier, and atomic_write_barrier on x86 and x86_64. A full
barrier is implemented through an atomic idempotent modification to the
stack and not through using mfence because the latter can supposedly be
somewhat slower due to having to provide stronger guarantees wrt.
self-modifying code, for example.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 8 ++++++++
NEWS | 25 +++++++++++++------------
sysdeps/i386/i486/bits/atomic.h | 7 +++++++
sysdeps/x86_64/bits/atomic.h | 7 +++++++
4 files changed, 35 insertions(+), 12 deletions(-)
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