__for_each_thread
__for_each_thread(signal, t) {
__for_each_thread(sig, t) {
__for_each_thread(sig, t)
__for_each_thread((p)->signal, t)
__for_each_thread(sig, t) {
__for_each_thread(signal, t) {
__for_each_thread(sig, t)
__for_each_thread(sig, t)