On Tue, Feb 20, 2001 at 12:50:54PM -0700, [EMAIL PROTECTED] wrote:
> barrier() is defined in kernel.h as follows :
>
> #define barrier() __asm__ __volatile__("": : :"memory")
>
> what does this mean ? is this like "nop" ?
It's a write barrier. It prevents the compiler from optimising writes
to memory: all outstanding writes should be done before the program
flow crosses the barrier().
Erik
--
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands
Phone: +31-15-2783635 Fax: +31-15-2781843 Email: [EMAIL PROTECTED]
WWW: http://www-ict.its.tudelft.nl/~erik/
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