test/fixedbugs/issue38093.go

   1 // +build js
   2 // run
   3
   4 // Copyright 2020 The Go Authors. All rights reserved.
   5 // Use of this source code is governed by a BSD-style
   6 // license that can be found in the LICENSE file.
   7
   8 // Test race condition between timers and wasm calls that led to memory corruption.
   9
  10 package main
  11
  12 import (
  13         "os"
  14         "syscall/js"
  15         "time"
  16 )
  17
  18 func main() {
  19         ch1 := make(chan struct{})
  20
  21         go func() {
  22                 for {
  23                         time.Sleep(5 * time.Millisecond)
  24                         ch1 <- struct{}{}
  25                 }
  26         }()
  27         go func() {
  28                 for {
  29                         time.Sleep(8 * time.Millisecond)
  30                         ch1 <- struct{}{}
  31                 }
  32         }()
  33         go func() {
  34                 time.Sleep(2 * time.Second)
  35                 os.Exit(0)
  36         }()
  37
  38         for range ch1 {
  39                 ch2 := make(chan struct{}, 1)
  40                 f := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
  41                         ch2 <- struct{}{}
  42                         return nil
  43                 })
  44                 defer f.Release()
  45                 fn := js.Global().Get("Function").New("cb", "cb();")
  46                 fn.Invoke(f)
  47                 <-ch2
  48         }
  49 }