init

status.go

@@ -0,0 +1,59 @@
+package orbyte
+
+import "sync/atomic"
+
+const (
+	statusisbuffered = 1 << iota
+	statusdestroyed
+)
+
+type status uintptr
+
+var destroyedstatus status
+
+func init() {
+	destroyedstatus.setdestroyed(true)
+}
+
+func (c status) mask(v bool, typ uintptr) (news status) {
+	news = c
+	if v {
+		news |= status(typ)
+	} else {
+		news &= ^status(typ)
+	}
+	return
+}
+
+func (c *status) setbool(v bool, typ uintptr) {
+	olds := atomic.LoadUintptr((*uintptr)(c))
+	oldv := olds&typ != 0
+	if oldv == v {
+		return
+	}
+	news := status(olds).mask(v, typ)
+	for !atomic.CompareAndSwapUintptr((*uintptr)(c), olds, uintptr(news)) {
+		olds = atomic.LoadUintptr((*uintptr)(c))
+		news = status(olds).mask(v, typ)
+	}
+}
+
+func (c *status) loadbool(typ uintptr) bool {
+	return atomic.LoadUintptr((*uintptr)(c))&typ != 0
+}
+
+func (c *status) isbuffered() bool {
+	return c.loadbool(statusisbuffered)
+}
+
+func (c *status) setbuffered(v bool) {
+	c.setbool(v, statusisbuffered)
+}
+
+func (c *status) hasdestroyed() bool {
+	return c.loadbool(statusdestroyed)
+}
+
+func (c *status) setdestroyed(v bool) {
+	c.setbool(v, statusdestroyed)
+}