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87 lines
2.1 KiB
87 lines
2.1 KiB
// Copyright 2019 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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package bitmap
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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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. "github.com/pingcap/check"
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)
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func TestT(t *testing.T) {
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TestingT(t)
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}
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var _ = Suite(&testBitmap{})
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type testBitmap struct{}
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func (s *testBitmap) TestConcurrentBitmapSet(c *C) {
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const loopCount = 1000
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const interval = 2
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bm := NewConcurrentBitmap(loopCount * interval)
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wg := &sync.WaitGroup{}
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for i := 0; i < loopCount; i++ {
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wg.Add(1)
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go func(bitIndex int) {
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bm.Set(bitIndex)
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wg.Done()
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}(i * interval)
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}
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wg.Wait()
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for i := 0; i < loopCount; i++ {
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if i%interval == 0 {
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c.Assert(bm.UnsafeIsSet(i), IsTrue)
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} else {
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c.Assert(bm.UnsafeIsSet(i), IsFalse)
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}
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}
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}
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// TestConcurrentBitmapUniqueSetter checks if isSetter is unique everytime
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// when a bit is set.
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func (s *testBitmap) TestConcurrentBitmapUniqueSetter(c *C) {
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const loopCount = 10000
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const competitorsPerSet = 50
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wg := &sync.WaitGroup{}
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bm := NewConcurrentBitmap(32)
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var setterCounter uint64
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var clearCounter uint64
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// Concurrently set bit, and check if isSetter count matchs zero clearing count.
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for i := 0; i < loopCount; i++ {
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// Clear bitmap to zero.
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if atomic.CompareAndSwapUint32(&(bm.segments[0]), 0x00000001, 0x00000000) {
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atomic.AddUint64(&clearCounter, 1)
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}
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// Concurrently set.
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for j := 0; j < competitorsPerSet; j++ {
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wg.Add(1)
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go func() {
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if bm.Set(31) {
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atomic.AddUint64(&setterCounter, 1)
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}
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wg.Done()
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}()
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}
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}
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wg.Wait()
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// If clearCounter is too big, it means setter concurrency of this test is not enough.
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c.Assert(clearCounter < loopCount, Equals, true)
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c.Assert(setterCounter, Equals, clearCounter+1)
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}
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