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xchg() ?



Hi,
I read some linux-traffic-control code recently, and was wondering
why, when and how should someone use xchg?
I havent found any info out there, and going down to asm/ didnt help.
Seems like (i386?) locking stuff or similar.

Thanks in advance for any hints i can get.
Vlado

ps. wrong newsgroup perhaps :-)) ????