package main
import (
	"fmt"
	"runtime"
	"strconv"
	"time"
)
func main() {
	//編寫一個函數(shù),每隔1s輸出"hello,world"
	//要求主線程和gorutine同時執(zhí)行
	go test()
	//在主線程中,開啟一個goroutine,該協(xié)程每隔1s輸出"hello,world"
	for i:=1;i<=10 ; i++ {
		fmt.Println("main() hello world", strconv.Itoa(i))
		time.Sleep(time.Second)
	}
	//查詢Golang運行的cpu數(shù)
	fmt.Println(runtime.NumCPU()) //4
	//設置Golang運行的cpu數(shù)
	//runtime.GOMAXPROCS(runtime.NumCPU()-1)	//3
}
func test(){
	for i:=1;i<=10 ; i++ {
		fmt.Println("test() hello world",strconv.Itoa(i))
		time.Sleep(time.Second)
	}
}

package main
import "fmt"
func main() {
	//定義管道
	var intChan chan int
	intChan =make(chan int,3)
	//寫入數(shù)據(jù)
	intChan<-10
	intChan<-20
	intChan<-30
	//遍歷
	close(intChan) //關閉管道
	for value := range intChan {
		fmt.Printf("%d\t",value) //10	20	30	
	}
}

package main
import "fmt"
func main() {
	numChan := make(chan int, 2000)
	resChan := make(chan int, 2000)
	exitChan := make(chan bool, 8)
	go putNum(numChan) //存放數(shù)據(jù)
	//開啟八個協(xié)程
	for i := 0; i < 8; i++ {
		go add(numChan, resChan, exitChan)
	}
	go func() {
		for i:=0;i<8 ;i++  {
			<-exitChan
		}
		close(resChan)
	}()
	for i := 1; i <=2000 ; i++ {
		fmt.Printf("resChan[%d]=%d\n", i, <-resChan)
	}
}
func putNum(numChan chan int) {
	for i := 1; i <= 2000; i++ {
		numChan <- i
	}
	close(numChan)
}
func add(numChan chan int, resChan chan int, exitChan chan bool) {
	for {
		n,ok := <-numChan
		if !ok{
			break
		}
		res := 0
		for i := 1; i <= n; i++ {
			res += i
		}
		resChan <- res
	}
	exitChan<-true
}