try_wait_for_completion(9) centos man page | unix.com

TRY_WAIT_FOR_COMPLET(9) 					   Driver Basics					   TRY_WAIT_FOR_COMPLET(9)

NAME
       try_wait_for_completion - try to decrement a completion without blocking

SYNOPSIS
       bool try_wait_for_completion(struct completion * x);

ARGUMENTS
       x
	   completion structure

RETURN
       0 if a decrement cannot be done without blocking 1 if a decrement succeeded.

       If a completion is being used as a counting completion, attempt to decrement the counter without blocking. This enables us to avoid waiting
       if the resource the completion is protecting is not available.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   TRY_WAIT_FOR_COMPLET(9)