can somebody explain barrier() macro ?

From: hiren_mehta@agilent.com
Date: Tue Feb 20 2001 - 14:50:54 EST

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Hi,

barrier() is defined in kernel.h as follows :

#define barrier() __asm__ __volatile__("": : :"memory")

what does this mean ? is this like "nop" ?

TIA,
-hiren
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