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// Copyright 2015 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package fileutil
import (
"io/ioutil"
"os"
"testing"
"time"
)
func TestLockAndUnlock(t *testing.T) {
f, err := ioutil.TempFile("", "lock")
if err != nil {
t.Fatal(err)
}
f.Close()
defer func() {
err = os.Remove(f.Name())
if err != nil {
t.Fatal(err)
}
}()
// lock the file
l, err := LockFile(f.Name(), os.O_WRONLY, PrivateFileMode)
if err != nil {
t.Fatal(err)
}
// try lock a locked file
if _, err = TryLockFile(f.Name(), os.O_WRONLY, PrivateFileMode); err != ErrLocked {
t.Fatal(err)
}
// unlock the file
if err = l.Close(); err != nil {
t.Fatal(err)
}
// try lock the unlocked file
dupl, err := TryLockFile(f.Name(), os.O_WRONLY, PrivateFileMode)
if err != nil {
t.Errorf("err = %v, want %v", err, nil)
}
// blocking on locked file
locked := make(chan struct{}, 1)
go func() {
bl, blerr := LockFile(f.Name(), os.O_WRONLY, PrivateFileMode)
if blerr != nil {
t.Error(blerr)
}
locked <- struct{}{}
if blerr = bl.Close(); blerr != nil {
t.Error(blerr)
}
}()
select {
case <-locked:
t.Error("unexpected unblocking")
case <-time.After(100 * time.Millisecond):
}
// unlock
if err = dupl.Close(); err != nil {
t.Fatal(err)
}
// the previously blocked routine should be unblocked
select {
case <-locked:
case <-time.After(1 * time.Second):
t.Error("unexpected blocking")
}
}
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