Date: Sat, 16 Nov 2002 09:05:06 -0800 (PST) From: Marcel Moolenaar <marcel@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/lib/libc_r/arch/ia64 _atomic_lock.S Message-ID: <200211161705.gAGH56v5058239@repoman.freebsd.org>
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marcel 2002/11/16 09:05:06 PST Modified files: lib/libc_r/arch/ia64 _atomic_lock.S Log: Implement the lock with a cmpxchg instruction instead of a xchg. Both are atomic, but the cmpxchg has memory ordering hints. We give this acquire semantics. NOTE: The unlock in libc_r is implemented by a "normal" assign statement. This is not correct on ia64 due to the memory ordering characteristics of the architecture. We need release semantics for an unlock. Revision Changes Path 1.2 +3 -2 src/lib/libc_r/arch/ia64/_atomic_lock.S To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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