lib/lock.js
function free(key) {
    if (locks[key]) {
        delete locks[key];
        stats.lock_remove();
    }
    tick(key);
}
function free(key) {
    if (locks[key]) {
        delete locks[key];
        stats.lock_remove();
    }
    tick(key);
}
function free ( key ) { if ( locks [ key ] ) { delete locks [ key ] ; stats . lock_remove ( ) ; } tick ( key ) ; }
release a lock on a resource
release a lock on a resource