// After this is called the thread can receive signals.
func minitSignalMask() {
	nmask := getg().m.sigmask
	for i := range sigtable {
		if !blockableSig(uint32(i)) {
			sigdelset(&nmask, i)
		}
	}
	sigprocmask(_SIG_SETMASK, &nmask, nil)
}

// unminitSignals is called from dropm, via unminit, to undo the
// effect of calling minit on a non-Go thread.
//