83 lines
1.3 KiB
Go
83 lines
1.3 KiB
Go
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package fileutil
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import (
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"io/ioutil"
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"os"
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"testing"
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"time"
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)
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func TestLockAndUnlock(t *testing.T) {
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f, err := ioutil.TempFile("", "lock")
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if err != nil {
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t.Fatal(err)
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}
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f.Close()
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defer func() {
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err := os.Remove(f.Name())
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if err != nil {
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t.Fatal(err)
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}
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}()
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// lock the file
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l, err := NewLock(f.Name())
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if err != nil {
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t.Fatal(err)
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}
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defer l.Destroy()
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err = l.Lock()
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if err != nil {
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t.Fatal(err)
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}
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// try lock a locked file
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dupl, err := NewLock(f.Name())
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if err != nil {
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t.Fatal(err)
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}
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err = dupl.TryLock()
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if err != ErrLocked {
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t.Errorf("err = %v, want %v", err, ErrLocked)
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}
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// unlock the file
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err = l.Unlock()
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if err != nil {
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t.Fatal(err)
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}
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// try lock the unlocked file
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err = dupl.TryLock()
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if err != nil {
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t.Errorf("err = %v, want %v", err, nil)
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}
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defer dupl.Destroy()
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// blocking on locked file
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locked := make(chan struct{}, 1)
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go func() {
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l.Lock()
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locked <- struct{}{}
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}()
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select {
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case <-locked:
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t.Error("unexpected unblocking")
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case <-time.After(10 * time.Millisecond):
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}
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// unlock
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err = dupl.Unlock()
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if err != nil {
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t.Fatal(err)
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}
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// the previously blocked routine should be unblocked
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select {
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case <-locked:
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case <-time.After(10 * time.Millisecond):
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t.Error("unexpected blocking")
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}
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}
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