73 lines
1.4 KiB
Go
73 lines
1.4 KiB
Go
// Copyright 2023 PingCAP, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package membuf
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import (
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"sync"
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"testing"
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"github.com/stretchr/testify/require"
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"go.uber.org/atomic"
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)
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func TestLimiter(t *testing.T) {
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limit := 20
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cur := atomic.NewInt64(0)
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l := NewLimiter(limit)
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wg := sync.WaitGroup{}
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for range 100 {
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wg.Add(1)
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go func() {
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defer wg.Done()
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l.Acquire(1)
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val := cur.Inc()
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require.LessOrEqual(t, val, int64(limit))
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cur.Dec()
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l.Release(1)
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}()
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}
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wg.Wait()
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require.Equal(t, limit, l.limit)
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}
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func TestWaitUpMultipleCaller(t *testing.T) {
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limit := 20
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l := NewLimiter(limit)
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l.Acquire(18)
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start := make(chan struct{}, 3)
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finish := make(chan struct{}, 3)
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for range 3 {
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go func() {
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start <- struct{}{}
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l.Acquire(3)
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finish <- struct{}{}
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}()
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}
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for range 3 {
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<-start
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}
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require.Len(t, finish, 0)
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l.Release(18)
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for range 3 {
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<-finish
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}
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require.Equal(t, limit-3*3, l.limit)
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}
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