centos man page for wake_up_process

WAKE_UP_PROCESS(9)						   Driver Basics						WAKE_UP_PROCESS(9)

NAME
       wake_up_process - Wake up a specific process

SYNOPSIS
       int wake_up_process(struct task_struct * p);

ARGUMENTS
       p
	   The process to be woken up.

DESCRIPTION
       Attempt to wake up the nominated process and move it to the set of runnable processes.

RETURN
       1 if the process was woken up, 0 if it was already running.

       It 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.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							WAKE_UP_PROCESS(9)