My Cron Job Code

//I have created my plugin which will get input from form and below code will run
        //My Code to create events
        //hookname = gh_post
        wp_schedule_event( $next_run, 'fifteen_minutes', $hookname, $args );
        $cron_stop_time = $next_run + 180;
        $hookname_stop = $hookname.'_stop';
        wp_schedule_single_event( $cron_stop_time, $hookname_stop, $args);

//I put this in functions.php
        add_action('gh_post_stop','gh_post_stop_callback');
function gh_post_stop_callback($args)
{

    update_option('touched_cron','stoped');
    while( false !== wp_unschedule_event( wp_next_scheduled( 'gh_post' ), 'gh_post' ) ) {}
}