switch_tl_lock
switch_tl_lock(rq, watcher[0].rq);
switch_tl_lock(watcher[0].rq, rq);
switch_tl_lock(rq, watcher[1].rq);
switch_tl_lock(watcher[1].rq, rq);
switch_tl_lock(w->rq, NULL);
switch_tl_lock(NULL, rq);
switch_tl_lock(NULL, w->rq);