/
/
opt
/
golang
/
1.19.4
/
test
/
fixedbugs
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You: 216.73.216.137
PHP 8.3.16
Dir:
/opt/golang/1.19.4/test/fixedbugs
Edit:
/opt/golang/1.19.4/test/fixedbugs/issue52612.go
// run // Copyright 2022 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package main import ( "sync/atomic" "unsafe" ) var one interface{} = 1 type eface struct { typ unsafe.Pointer data unsafe.Pointer } func f(c chan struct{}) { var x atomic.Value go func() { x.Swap(one) // writing using the old marker }() for i := 0; i < 100000; i++ { v := x.Load() // reading using the new marker p := (*eface)(unsafe.Pointer(&v)).typ if uintptr(p) == ^uintptr(0) { // We read the old marker, which the new reader // doesn't know is a case where it should retry // instead of returning it. panic("bad typ field") } } c <- struct{}{} } func main() { c := make(chan struct{}, 10) for i := 0; i < 10; i++ { go f(c) } for i := 0; i < 10; i++ { <-c } }
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