mirror of
https://github.com/golang/go
synced 2024-10-04 13:21:22 -06:00
895c5db6df
This implementation is simpler and more useful, since it can work with methods. R=rsc CC=golang-dev https://golang.org/cl/1864051
38 lines
603 B
Go
38 lines
603 B
Go
// Copyright 2009 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 sync_test
|
|
|
|
import (
|
|
. "sync"
|
|
"testing"
|
|
)
|
|
|
|
type one int
|
|
|
|
func (o *one) Increment() {
|
|
*o++
|
|
}
|
|
|
|
func run(once *Once, o *one, c chan bool) {
|
|
once.Do(func() { o.Increment() })
|
|
c <- true
|
|
}
|
|
|
|
func TestOnce(t *testing.T) {
|
|
o := new(one)
|
|
once := new(Once)
|
|
c := make(chan bool)
|
|
const N = 10
|
|
for i := 0; i < N; i++ {
|
|
go run(once, o, c)
|
|
}
|
|
for i := 0; i < N; i++ {
|
|
<-c
|
|
}
|
|
if *o != 1 {
|
|
t.Errorf("once failed: %d is not 1", *o)
|
|
}
|
|
}
|