centos man page for complete

COMPLETE(9)							   Driver Basics						       COMPLETE(9)

NAME
       complete - signals a single thread waiting on this completion

SYNOPSIS
       void complete(struct completion * x);

ARGUMENTS
       x
	   holds the state of this particular completion

DESCRIPTION
       This will wake up a single thread waiting on this completion. Threads will be awakened in the same order in which they were queued.

       See also complete_all, wait_for_completion and related routines.

       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							       COMPLETE(9)