On 07/12/2011 12:14 PM, Peter Zijlstra wrote:
On Tue, 2011-07-12 at 12:08 +0300, Avi Kivity wrote: > Similar, but with stronger guarantees: when the function is called, > current == p, and the task was either sleeping or in userspace. If the task is sleeping, current can never be p.
The guarantee is that the task was sleeping just before the function is called. Of course it's woken up to run the function.
The idea is that you run the function in a known safe point to avoid extra synchronization.
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