__WAKE_UP - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Driver Basics

NAME__wake_up − wake up threads blocked on a waitqueue​.

SYNOPSISvoid __wake_up(wait_queue_head_t * q, unsigned int mode, int nr_exclusive, void * key);

ARGUMENTSq the waitqueue mode which threads nr_exclusive how many wake−one or wake−many threads to wake up key is directly passed to the wakeup function

DESCRIPTIONIt may be assumed that this function implies a write memory barrier before changing the task state if and only if any tasks are woken up​.

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