// mstart(), the combined runtime can deadlock if
		// these signals are blocked. Thus, don't block these
		// signals when exiting threads.
		// - glibc: SIGCANCEL (32), SIGSETXID (33)
		// - musl: SIGTIMER (32), SIGCANCEL (33), SIGSYNCCALL (34)
		sigdelset(&res, 32)
		sigdelset(&res, 33)
		sigdelset(&res, 34)
	}

	return res
}()

// sigblock blocks signals in the current thread's signal mask.