firstly, finalizers are never guaranteed to be run.
secondly, there are many modifications/improvements in
the garbage collection implementation in the official Go compiler, from
version to version.
The garbage collection implementation in Go 1.8 is better than Go 1.7
so that the S object is finalized earlier than Go 1.7.
On Thursday, September 7, 2017 at 12:21:33 PM UTC-4, Huafeng wrote:
>
> package main
>
> import (
> "sync"
> "runtime"
> )
>
> type S struct {
> chs chan int
> }
>
> var wg sync.WaitGroup
>
> func worker(s *S) {
> for i := range s.chs {
> println("In worker, ch = ", i)
> }
>
> wg.Done()
> }
>
> func main() {
> s := S{make(chan int)}
>
> runtime.SetFinalizer(&s, func(ss *S) {
> println("Finalizer")
> close(ss.chs)
> })
>
>
> wg.Add(1)
>
> go worker(&s)
> for i := 0; i < 1; i++ {
> s.chs <- 1
> }
>
> runtime.GC()
>
> wg.Wait()
> }
>
>
> *Output (Go 1.8.3):*
>
>
> In worker, ch = 1
> Finalizer
>
>
>
> ---
>
> As my expectation, runtime.GC() will not collect `s` , because `worker`
> still holds a reference to `s.chs`. So that the program would deadlock.
>
> However, this program terminates in go 1.8.3, while deadlocks in go 1.7.
>
> Does something change in go 1.8.3?
>
> I guess it has something to do with `range` and `channel`, but know
> nothing more .
>
> Does anyone know what happens to this garbage collection process?
>
> Thanks very much for reading this.
>
>
>
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