| // 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.Fatal(blerr) |
| } |
| locked <- struct{}{} |
| if blerr = bl.Close(); blerr != nil { |
| t.Fatal(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") |
| } |
| } |