golang的对象的GC空闲内存是否只能由goroutine引用？

Question

m := map[string]*Object {
    "a": obj
}
go func(obj *Object) {
    obj.Do()
}(m["a"])

delete(m, "a")

will GC free memory of obj when obj.Do() has not finished?

Answer 1

The code will evaluate

m["a"]

which will give the pointer obj, then obj will be placed on a new stack for the goroutine, and then the goroutine will be started with that stack, and then obj will be removed from the map in the original goroutine. At that point the new goroutine stack will have a pointer to obj, and so obj will not be gc'ed for that reason until the 2nd goroutine completes execution.