February 12, 2011 
Definition:
function wp_set_post_lock( $post_id ) {}
Mark the post as currently being edited by the current user
Parameters
- int $post_id: ID of the post to being edited
Return values
returns:Returns false if the post doesn’t exist of there is no current user, or an array of the lock time and the user ID.
Source code
function wp_set_post_lock( $post_id ) {
if ( !$post = get_post( $post_id ) )
return false;
if ( 0 == ($user_id = get_current_user_id()) )
return false;
$now = time();
$lock = "$now:$user_id";
update_post_meta( $post->ID, '_edit_lock', $lock );
}
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A HitchHackers guide through WordPress 
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