Исходники и презентации

lessons/garbage_collector/finalizers_resurrection/main.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+	"time"
+	"unsafe"
+)
+
+var globalData *Data
+
+type Data struct {
+	name string
+}
+
+func NewData(name string) *Data {
+	data := &Data{
+		name: name,
+	}
+
+	fmt.Println("created", name)
+	runtime.SetFinalizer(data, func(ptr *Data) {
+		fmt.Println("finalizer called on addr", unsafe.Pointer(ptr), "value is", ptr.name)
+		globalData = ptr
+	})
+
+	return data
+}
+
+func main() {
+	data := NewData("data")
+	_ = data
+
+	runtime.GC()
+	time.Sleep(time.Second)
+
+	fmt.Println("resurrected on addr", unsafe.Pointer(globalData), "value is", globalData.name)
+}