var handlingSig [_NSIG]uint32

// channels for synchronizing signal mask updates with the signal mask
// thread
var (
	disableSigChan  chan uint32
	enableSigChan   chan uint32
	maskUpdatedChan chan struct{}
)

func init() {
	// _NSIG is the number of signals on this operating system.
	// sigtable should describe what to do for all the possible signals.