mirror of https://github.com/k3s-io/k3s
62 lines
1.3 KiB
Go
62 lines
1.3 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package runtime
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import (
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"sync"
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"sync/atomic"
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"testing"
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"time"
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)
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func Test_LatchAcquireBasic(t *testing.T) {
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var x Latch
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if !x.Acquire() {
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t.Fatalf("expected first acquire to succeed")
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}
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if x.Acquire() {
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t.Fatalf("expected second acquire to fail")
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}
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if x.Acquire() {
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t.Fatalf("expected third acquire to fail")
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}
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}
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func Test_LatchAcquireConcurrent(t *testing.T) {
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var x Latch
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const NUM = 10
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ch := make(chan struct{})
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var success int32
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var wg sync.WaitGroup
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wg.Add(NUM)
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for i := 0; i < NUM; i++ {
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go func() {
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defer wg.Done()
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<-ch
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if x.Acquire() {
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atomic.AddInt32(&success, 1)
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}
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}()
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}
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time.Sleep(200 * time.Millisecond)
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close(ch)
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wg.Wait()
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if success != 1 {
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t.Fatalf("expected single acquire to succeed instead of %d", success)
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}
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}
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