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Commit 35d429f

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Create goroutine.md
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‎Multi-Thread/goroutine.md

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# Goroutine
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1. 两个协程轮流打印 `1, 2`
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```go
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package main
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import (
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"fmt"
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"sync"
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)
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var wg sync.WaitGroup
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func main() {
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wg.Add(2)
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ch1 := make(chan int)
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go func() {
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defer wg.Done()
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for i := 0; i < 10; i++ {
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ch1 <- i
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if i%2 == 0 {
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fmt.Println("1: ", i)
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}
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}
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}()
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go func() {
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defer wg.Done()
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for i := 0; i < 10; i++ {
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<-ch1
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if i%2 == 1 {
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fmt.Println("2: ", i)
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}
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}
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}()
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wg.Wait()
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}
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```
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2. 三个协程轮流打印 `1, 2, 3`
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```go
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package main
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import (
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"fmt"
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"sync"
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)
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func main() {
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var wg sync.WaitGroup
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wg.Add(2)
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ch1 := make(chan int)
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ch2 := make(chan int)
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go func() {
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defer wg.Done()
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for i := 0; i < 100; i++ {
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<-ch1
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<-ch2
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if i%3 == 0 {
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fmt.Println(1, ": ", i)
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}
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}
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}()
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go func() {
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defer wg.Done()
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for i := 0; i < 100; i++ {
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ch1 <- 1
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if i%3 == 1 {
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fmt.Println(2, ": ", i)
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}
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}
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}()
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go func() {
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defer wg.Done()
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for i := 0; i < 100; i++ {
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ch2 <- 1
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if i%3 == 2 {
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fmt.Println(3, ": ", i)
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}
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}
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}()
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wg.Wait()
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}
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```
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3. 生产者消费者模型
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```go
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package main
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import (
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"fmt"
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"sync"
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)
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var wg sync.WaitGroup
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var lock sync.Mutex
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func main() {
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ch := make(chan int, 100)
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producer(ch)
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cnt := 3
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wg.Add(cnt)
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for i := 0; i < cnt; i++ {
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go consumer(i, ch)
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}
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wg.Wait()
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}
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func producer(ch chan int) {
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defer close(ch)
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for i := 0; i < 10; i++ {
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fmt.Println("producer: ", i)
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ch <- i
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}
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}
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func consumer(i int, ch chan int) {
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for {
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if v, ok := <-ch; ok {
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fmt.Println("consumer ", i, ":", v)
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} else {
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break
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}
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}
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wg.Done()
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}
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```
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