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// Copyright 2021 The gVisor 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 eventfd
import (
"testing"
"time"
)
func TestReadWrite(t *testing.T) {
efd, err := Create()
if err != nil {
t.Fatalf("failed to Create(): %v", err)
}
defer efd.Close()
// Make sure we can read actual values
const want = 343
if err := efd.Write(want); err != nil {
t.Fatalf("failed to write value: %d", want)
}
got, err := efd.Read()
if err != nil {
t.Fatalf("failed to read value: %v", err)
}
if got != want {
t.Fatalf("Read(): got %d, but wanted %d", got, want)
}
}
func TestWait(t *testing.T) {
efd, err := Create()
if err != nil {
t.Fatalf("failed to Create(): %v", err)
}
defer efd.Close()
// There's no way to test with certainty that Wait() blocks indefinitely, but
// as a best-effort we can wait a bit on it.
errCh := make(chan error)
go func() {
errCh <- efd.Wait()
}()
select {
case err := <-errCh:
t.Fatalf("Wait() returned without a call to Notify(): %v", err)
case <-time.After(500 * time.Millisecond):
}
// Notify and check that Wait() returned.
if err := efd.Notify(); err != nil {
t.Fatalf("Notify() failed: %v", err)
}
select {
case err := <-errCh:
if err != nil {
t.Fatalf("Read() failed: %v", err)
}
case <-time.After(5 * time.Second):
t.Fatalf("Read() did not return after Notify()")
}
}
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