issue38093.go

     1  // run
     2  
     3  //go:build js
     4  
     5  // Copyright 2020 The Go Authors. All rights reserved.
     6  // Use of this source code is governed by a BSD-style
     7  // license that can be found in the LICENSE file.
     8  
     9  // Test race condition between timers and wasm calls that led to memory corruption.
    10  
    11  package main
    12  
    13  import (
    14  	"os"
    15  	"syscall/js"
    16  	"time"
    17  )
    18  
    19  func main() {
    20  	ch1 := make(chan struct{})
    21  
    22  	go func() {
    23  		for {
    24  			time.Sleep(5 * time.Millisecond)
    25  			ch1 <- struct{}{}
    26  		}
    27  	}()
    28  	go func() {
    29  		for {
    30  			time.Sleep(8 * time.Millisecond)
    31  			ch1 <- struct{}{}
    32  		}
    33  	}()
    34  	go func() {
    35  		time.Sleep(2 * time.Second)
    36  		os.Exit(0)
    37  	}()
    38  
    39  	for range ch1 {
    40  		ch2 := make(chan struct{}, 1)
    41  		f := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
    42  			ch2 <- struct{}{}
    43  			return nil
    44  		})
    45  		defer f.Release()
    46  		fn := js.Global().Get("Function").New("cb", "cb();")
    47  		fn.Invoke(f)
    48  		<-ch2
    49  	}
    50  }
    51
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