| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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 internal |
| |
| import ( |
| "sync" |
| "testing" |
| "time" |
| |
| "github.com/stretchr/testify/assert" |
| ) |
| |
| func TestSemaphore(t *testing.T) { |
| s := NewSemaphore(3) |
| |
| const n = 10 |
| |
| wg := sync.WaitGroup{} |
| wg.Add(n) |
| |
| for i := 0; i < n; i++ { |
| go func() { |
| s.Acquire() |
| time.Sleep(100 * time.Millisecond) |
| s.Release() |
| wg.Done() |
| }() |
| } |
| |
| wg.Wait() |
| } |
| |
| func TestSemaphore_TryAcquire(t *testing.T) { |
| s := NewSemaphore(1) |
| |
| s.Acquire() |
| |
| assert.False(t, s.TryAcquire()) |
| |
| s.Release() |
| |
| assert.True(t, s.TryAcquire()) |
| assert.False(t, s.TryAcquire()) |
| s.Release() |
| } |