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master
test/fixedbugs/issue52612.go
49 строк
881 B
Keith Randall
sync/atomic: use consistent first-store-in-progress marker
29 апр 2022, 23:42
29 апр 2022, 23:42
2278a51
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// 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 } }