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Name: Stephan Keil
eMail: Stephan.Keil@gmx.de
Date: June 10, 2003 at 02:30:56
Subject: Hyperthreading and 'lock' prefix
Text: Hi,

the x86 instruction set supports the 'lock' prefix for various
instructions (e.g. inc, add) to guarantee atomicity in multiprocessor
environments, i.e. multiple _physical_ processors. But is this
prefix also necessary for hyperthreading processors, i.e. two
logical processors within one physical processor?

Thx and regards,

Stephan


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