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xchg vs lock

To: kernelnewbies@xxxxxxxxxxxx
Subject: xchg vs lock
From: Mohammad M Molla <merajul_i@xxxxxxxxx>
Date: Sun, 30 Sep 2007 17:08:04 -0700 (PDT)
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Hi

Inside the kernel, I see in many places xchg is used to swap two pointers atomically? What is the difference between exchanging using xchg and getting lock, then exchange, then unlock? Is it only performance reason?

Thanks,

- Meraj

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