зеркало из https://github.com/microsoft/docker.git
125 строки
2.0 KiB
Go
125 строки
2.0 KiB
Go
package locker
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import (
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"sync"
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"testing"
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"time"
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)
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func TestLockCounter(t *testing.T) {
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l := &lockCtr{}
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l.inc()
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if l.waiters != 1 {
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t.Fatal("counter inc failed")
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}
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l.dec()
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if l.waiters != 0 {
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t.Fatal("counter dec failed")
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}
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}
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func TestLockerLock(t *testing.T) {
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l := New()
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l.Lock("test")
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ctr := l.locks["test"]
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if ctr.count() != 0 {
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t.Fatalf("expected waiters to be 0, got :%d", ctr.waiters)
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}
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chDone := make(chan struct{})
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go func() {
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l.Lock("test")
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close(chDone)
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}()
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chWaiting := make(chan struct{})
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go func() {
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for range time.Tick(1 * time.Millisecond) {
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if ctr.count() == 1 {
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close(chWaiting)
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break
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}
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}
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}()
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select {
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case <-chWaiting:
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case <-time.After(3 * time.Second):
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t.Fatal("timed out waiting for lock waiters to be incremented")
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}
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select {
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case <-chDone:
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t.Fatal("lock should not have returned while it was still held")
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default:
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}
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if err := l.Unlock("test"); err != nil {
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t.Fatal(err)
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}
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select {
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case <-chDone:
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case <-time.After(3 * time.Second):
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t.Fatalf("lock should have completed")
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}
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if ctr.count() != 0 {
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t.Fatalf("expected waiters to be 0, got: %d", ctr.count())
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}
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}
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func TestLockerUnlock(t *testing.T) {
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l := New()
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l.Lock("test")
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l.Unlock("test")
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chDone := make(chan struct{})
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go func() {
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l.Lock("test")
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close(chDone)
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}()
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select {
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case <-chDone:
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case <-time.After(3 * time.Second):
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t.Fatalf("lock should not be blocked")
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}
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}
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func TestLockerConcurrency(t *testing.T) {
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l := New()
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var wg sync.WaitGroup
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for i := 0; i <= 10000; i++ {
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wg.Add(1)
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go func() {
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l.Lock("test")
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// if there is a concurrency issue, will very likely panic here
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l.Unlock("test")
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wg.Done()
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}()
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}
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chDone := make(chan struct{})
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go func() {
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wg.Wait()
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close(chDone)
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}()
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select {
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case <-chDone:
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case <-time.After(10 * time.Second):
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t.Fatal("timeout waiting for locks to complete")
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}
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// Since everything has unlocked this should not exist anymore
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if ctr, exists := l.locks["test"]; exists {
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t.Fatalf("lock should not exist: %v", ctr)
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}
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}
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