waitgroup_test.go

Documentation: k8s.io/apimachinery/pkg/util/waitgroup

     1  /*
     2  Copyright 2017 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  // Package waitgroup test cases reference golang sync.WaitGroup https://golang.org/src/sync/waitgroup_test.go.
    18  package waitgroup
    19  
    20  import (
    21  	"testing"
    22  )
    23  
    24  func TestWaitGroup(t *testing.T) {
    25  	wg1 := &SafeWaitGroup{}
    26  	wg2 := &SafeWaitGroup{}
    27  	n := 16
    28  	wg1.Add(n)
    29  	wg2.Add(n)
    30  	exited := make(chan bool, n)
    31  	for i := 0; i != n; i++ {
    32  		go func(i int) {
    33  			wg1.Done()
    34  			wg2.Wait()
    35  			exited <- true
    36  		}(i)
    37  	}
    38  	wg1.Wait()
    39  	for i := 0; i != n; i++ {
    40  		select {
    41  		case <-exited:
    42  			t.Fatal("SafeWaitGroup released group too soon")
    43  		default:
    44  		}
    45  		wg2.Done()
    46  	}
    47  	for i := 0; i != n; i++ {
    48  		<-exited // Will block if barrier fails to unlock someone.
    49  	}
    50  }
    51  
    52  func TestWaitGroupAddFail(t *testing.T) {
    53  	wg := &SafeWaitGroup{}
    54  	wg.Add(1)
    55  	wg.Done()
    56  	wg.Wait()
    57  	if err := wg.Add(1); err == nil {
    58  		t.Errorf("Should return error when add positive after Wait")
    59  	}
    60  }
    61
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