add atomic bool

sync2/atomic.go

@@ -130,3 +130,17 @@ func (s *AtomicString) CompareAndSwap(oldval, newval string) (swqpped bool) {
 	}
 	return false
 }
+
+type AtomicBool int32
+
+func (b *AtomicBool) Set(v bool) {
+	if v {
+		atomic.StoreInt32((*int32)(b), 1)
+	} else {
+		atomic.StoreInt32((*int32)(b), 0)
+	}
+}
+
+func (b *AtomicBool) Get() bool {
+	return atomic.LoadInt32((*int32)(i)) == 1
+}

sync2/atomic_test.go

@@ -29,4 +29,21 @@ func TestAtomicString(t *testing.T) {
 	if s.Get() != "c" {
 		t.Errorf("want c, got %s", s.Get())
 	}
+
+	var b AtomicBool
+	if b.Get() != false {
+		t.Fatal("must false")
+	}
+
+	b.Set(true)
+
+	if b.Get() != true {
+		t.Fatal("must true")
+	}
+
+	b.Set(false)
+
+	if b.Get() != false {
+		t.Fatal("must false")
+	}
 }