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__wake_up_sync
Langue: en
Version: June 2009 (debian - 07/07/09)
Section: 9 (Appels noyau Linux)
NAME
__wake_up_sync - wake up threads blocked on a waitqueue.SYNOPSIS
- void __wake_up_sync(wait_queue_head_t * q, unsigned int mode, int nr_exclusive);
ARGUMENTS
q
- the waitqueue
mode
- which threads
nr_exclusive
- how many wake-one or wake-many threads to wake up
DESCRIPTION
The sync wakeup differs that the waker knows that it will schedule away soon, so while the target thread will be woken up, it will not be migrated to another CPU - ie. the two threads are 'synchronized' with each other. This can prevent needless bouncing between CPUs.
On UP it can prevent extra preemption.
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