17. Goroutine 的并发与超时控制

Goroutine 的并发与超时控制

并发

package main

import (
    "fmt"
    "time"
)

func run(task_id, sleeptime int, ch chan string) {
   
    time.Sleep(time.Duration(sleeptime) * time.Second)
    ch <- fmt.Sprintf("task id %d , sleep %d second", task_id, sleeptime)
    return
}

func main() {
   
    input := []int{
   3, 2, 1}
    ch := make(chan string)
    startTime := time.Now()
    fmt.Println("Multirun start")
    for i, sleeptime := range input {
   
        go run(i, sleeptime, ch)
    }

    for range input {
   
        fmt.Println(<-ch)
    }

    endTime := time.Now()
    fmt.Printf("Multissh finished. Process time %s. Number of tasks is %d", endTime.Sub(startTime), len(input))
}

Multirun start
task id 2 , sleep 1 second
task id 1 , sleep 2 second
task id 0 , sleep 3 second
Multissh finished. Process time 3s. Number of tasks is 3
Program exited.

按序返回

package main

import (
    "fmt"
    "time"
)

func run(task_id, sleeptime int, ch chan string) {
   

    time.Sleep(time