You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
38 lines
724 B
38 lines
724 B
// run
|
|
// +build !js
|
|
|
|
// Copyright 2017 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 (
|
|
"fmt"
|
|
"runtime"
|
|
"sync/atomic"
|
|
"time"
|
|
)
|
|
|
|
var a uint64 = 0
|
|
|
|
func main() {
|
|
runtime.GOMAXPROCS(2) // With just 1, infinite loop never yields
|
|
|
|
go func() {
|
|
for {
|
|
atomic.AddUint64(&a, uint64(1))
|
|
}
|
|
}()
|
|
|
|
time.Sleep(10 * time.Millisecond) // Short sleep is enough in passing case
|
|
i, val := 0, atomic.LoadUint64(&a)
|
|
for ; val == 0 && i < 100; val, i = atomic.LoadUint64(&a), i+1 {
|
|
time.Sleep(100 * time.Millisecond)
|
|
}
|
|
if val == 0 {
|
|
fmt.Printf("Failed to observe atomic increment after %d tries\n", i)
|
|
}
|
|
|
|
}
|