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// Copyright 2018 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 amutex
import (
"sync"
"testing"
"time"
)
type sleeper struct {
ch chan struct{}
}
func (s *sleeper) SleepStart() <-chan struct{} {
return s.ch
}
func (*sleeper) SleepFinish(bool) {
}
func (s *sleeper) Interrupted() bool {
return len(s.ch) != 0
}
func TestMutualExclusion(t *testing.T) {
var m AbortableMutex
m.Init()
// Test mutual exclusion by running "gr" goroutines concurrently, and
// have each one increment a counter "iters" times within the critical
// section established by the mutex.
//
// If at the end of the counter is not gr * iters, then we know that
// goroutines ran concurrently within the critical section.
//
// If one of the goroutines doesn't complete, it's likely a bug that
// causes it to wait forever.
const gr = 1000
const iters = 100000
v := 0
var wg sync.WaitGroup
for i := 0; i < gr; i++ {
wg.Add(1)
go func() {
for j := 0; j < iters; j++ {
m.Lock(nil)
v++
m.Unlock()
}
wg.Done()
}()
}
wg.Wait()
if v != gr*iters {
t.Fatalf("Bad count: got %v, want %v", v, gr*iters)
}
}
func TestAbortWait(t *testing.T) {
var s sleeper
var m AbortableMutex
m.Init()
// Lock the mutex.
m.Lock(&s)
// Lock again, but this time cancel after 500ms.
s.ch = make(chan struct{}, 1)
go func() {
time.Sleep(500 * time.Millisecond)
s.ch <- struct{}{}
}()
if v := m.Lock(&s); v {
t.Fatalf("Lock succeeded when it should have failed")
}
// Lock again, but cancel right away.
s.ch <- struct{}{}
if v := m.Lock(&s); v {
t.Fatalf("Lock succeeded when it should have failed")
}
}
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