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A1B2C3: Two Go Routine Print A1B2C3....Z26	LEETCODELINK	2022-07-25 13:11:00 +0800	2022-07-25 13:11:00 +0800	false	Kimi.Tsai	https://kimi0230.github.io/	Two Go Routine Print A1B2C3....Z26			Algorithm Golang A1B2C3	Algorithm			false	false	false	true	true	true	true	false	false	enable auto true true	copy maxShownLines true 200	enable		enable true	enable true	css js	images

A1B2C3

用兩個 go routine 印出 A1B2C3....Z26 Two Go Routine Print A1B2C3....Z26

Channle With Buffer

func ChannelWBuffer() {
	abc := make(chan struct{}, 1)
	num := make(chan struct{}, 1)
	done := make(chan struct{})
	abc <- struct{}{}

	go func() {
		for i := 65; i <= 90; i++ {
			<-abc
			// fmt.Printf("%v", string(rune(i)))
			num <- struct{}{}
		}
	}()
	go func() {
		for i := 1; i <= 26; i++ {
			<-num
			// fmt.Printf("%v", i)
			abc <- struct{}{}
		}
		done <- struct{}{}
	}()
	// time.Sleep(1 * time.Second)
	<-done
}

Channel Without Buffer

func ChannelWOBuffer() {
	abc := make(chan struct{})
	num := make(chan struct{})
	done := make(chan struct{})

	go func() {
		for i := 65; i <= 90; i++ {
			// fmt.Printf("%v", string(rune(i)))
			abc <- struct{}{}
			<-num
		}
	}()
	go func() {
		for i := 1; i <= 26; i++ {
			<-abc
			// fmt.Printf("%v", i)
			num <- struct{}{}
		}
		done <- struct{}{}
	}()
	// time.Sleep(1 * time.Second)
	<-done
}

Wait Group

func WGLock() {
	abcMux := sync.Mutex{}
	numMux := sync.Mutex{}

	numMux.Lock()
	wg := sync.WaitGroup{}
	wg.Add(2)
	go func() {
		defer wg.Done()
		for i := 65; i <= 90; i++ {
			abcMux.Lock()
			// fmt.Printf("%v", string(rune(i)))
			numMux.Unlock()
		}
	}()
	go func() {
		defer wg.Done()
		for i := 1; i <= 26; i++ {
			numMux.Lock()
			// fmt.Printf("%v", i)
			abcMux.Unlock()
		}
	}()
	wg.Wait()
}

Benchmark

goos: darwin
goarch: amd64
pkg: LeetcodeGolang/Algorithms/A1B2C3
cpu: Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz
BenchmarkChannelWBuffer-4          79159             14612 ns/op             344 B/op          5 allocs/op
BenchmarkChannelWOBuffer-4         83068             14451 ns/op             344 B/op          5 allocs/op
BenchmarkWGLock-4                  51303             23072 ns/op              96 B/op          5 allocs/op
PASS
ok      LeetcodeGolang/Algorithms/A1B2C3        4.092s