new future IO and demo

x/cbind/buf.go

@@ -10,3 +10,7 @@ type slice struct {
 func GoBytes(buf *int8, n int) []byte {
 	return *(*[]byte)(unsafe.Pointer(&slice{unsafe.Pointer(buf), n}))
 }
+
+func CBuffer(data []byte) (*int8, int) {
+	return (*int8)(unsafe.Pointer(&data[0])), len(data)
+}