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How has Windows evolved, as a general purpose operating system and at the lowest levels, in Windows 7? Who better to talk to than Technical Fellow and Windows Kernel guru Mark Russinovich? Here, Mark enlightens us on the new kernel constructs in Windows 7 (and, yeah, we do wander up into user mode, but only briefly). One very important change in the Windows 7 kernel is the dismantling of the dispatcher spin lock and redesign and implementation of its functionality. This great work was done by Arun Kishan (you've met him here on C9 last year). EDIT: You can learn exactly what Arun did in eliminating the dispatcher lock and replacing it with a set of synchronization primitives and a new "pre-wait" thread state, here. The direct result of the reworking of the dispatcher lock is that Windows 7 can scale to 256 processors



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