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// run
// 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)
}
}
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