diff options
Diffstat (limited to 'libgo/go/sync/once_test.go')
-rw-r--r-- | libgo/go/sync/once_test.go | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/libgo/go/sync/once_test.go b/libgo/go/sync/once_test.go new file mode 100644 index 000000000..155954a49 --- /dev/null +++ b/libgo/go/sync/once_test.go @@ -0,0 +1,37 @@ +// 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) + } +} |