go 併發策略

go的多線程併發策略

 

 

package main

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"time"

	//"sync"
)

func Done(id) {
	//參數爲默認
	client := &http.Client{} //生成要訪問的url
	url := fmt.Sprintf("http://a.b.c?a=1&b=%s",id) //提交請求/request 請求連接
	//get請求
	reqest, err := http.NewRequest("GET", url, nil) //增加header選項
	//post請求
	/*
	reqest, err := http.NewRequest("POST", url,strings.NewReader("a=xxx")) //增加header選項
	*/
	reqest.Header.Add("Cookie","");
	reqest.Header.Add("User-Agent", "Mozilla/5.0")
	reqest.Header.Add("X-Requested-With", "XMLHttpRequest")
	if err != nil {
		panic(err)
	}
	//處理返回結果
	response, _ := client.Do(reqest)
	body, err := ioutil.ReadAll(response.Body)
	if err != nil {
		// handle error
	}

	fmt.Println(string(body))
	defer response.Body.Close()
}

func ThreadP() {
	loopNum := 5
	//開啓三個線程，說明線程池中只有三個線程， 在實際情況下可以動態設置開啓線程數量
	for w := 1; w <= loopNum; w++ {
		//go worker(w, jobs, results)
		go Done(1);  //id=1
	}
}
func ThreadY() {
	loopNum := 2
	//開啓三個線程，說明線程池中只有三個線程， 在實際情況下可以動態設置開啓線程數量
	for w := 1; w <= loopNum; w++ {
		//go worker(w, jobs, results)
		go Done(1); //id=1
	}
}

func main()  {
	/*var wg sync.WaitGroup
	loop :=1
	wg.Add(16);
	for i :=0;i<=loop;i++{
		go func(i int) {
			ThreadP()
			//ThreadY()
			wg.Done()
		}(i)
	}
	wg.Wait()
*/

	for w := 1; w <= 3; w++ {
		//go worker(w, jobs, results)
		Done(1)  //id =1
		time.Sleep(1*time.Second)
	}
}


/*func main()  {
	wg := sync.WaitGroup{}
	wg.Add(2)
	for i := 0; i < 3; i++ {
		go func(i int) {
			//fmt.Println(i)
			Done()
			wg.Done()
		}(i)
	}
	wg.Wait()
}*/