As for as I know,when process/Thread is in runqueue,then may have allocate some resource even they do not running right now,In order to keep the data consistent(can not be modified by other processes/threads) ,we should use spinlock to protect the data.
在2007-09-19，"Mansha Linux" <mansha.linux@xxxxxxxxx> ：
Hi all,
Could you please explain me why do we need the spinlocks on uniprocessor machines?
Is this the only reason that the kernel is preemptive ?
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regards,
Mansha
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