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From: "Maciej W. Rozycki" <macro@codesourcery.com> Date: Mon, 4 Mar 2013 20:56:08 +0000
They could be easily emulated with the aid of global spinlocks, but given the decline of the i386 it's probably not worth the effort.
This is a misnomer, you can't use global spinlocks as those are not signal safe and will deadlock. Even the glibc testsuite will trigger such deadlocks.
-- Florian Weimer / Red Hat Product Security Team
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