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inline assembler question


From: gumbold
Subject: inline assembler question
Date: Wed, 18 May 2005 10:28:42 +0300
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.7) Gecko/20050414

Hi

please tell me what it means:
#define MBARRIER() __asm__ __volatile__ ("lock; addl $0,0(%%esp)" ::: "memory")
#define UNLOCK_MBARRIER() __asm__ __volatile__ ("" ::: "memory")




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