race.go

gistfile1.txt

package main

import (
    "fmt"
    "math/rand"
    "os"
    "strconv"
    "sync"
    "time"
)

func main() {
    race := make(map[int]int)
    /*
        var keys []int
        for i := 0; i < 10000; i++ {
            keys = append(keys, i)
        }
    */
    for j := 0; j < 5000; j++ {
        race[j] = rand.Int()
    }

    for i := 0; i < 1; i++ {
        go func() {
            race2 := make(map[int]int, len(race))
            for j := 5000; j < 8000; j++ {
                race2[j] = rand.Int()
            }
            race = race2
        }()
    }

    var wg sync.WaitGroup
    for i := 0; i < 100; i++ {
        wg.Add(1)
        go func(index int) {
            fd, _ := os.Create(strconv.FormatInt(time.Now().Unix(), 10) + "-" + strconv.Itoa(index))
            var keys []int
            for k := range race {
                keys = append(keys, k)
            }

            for _, k := range keys {
                fd.Write([]byte(fmt.Sprintf("id: %d, key: %d, value: %d\n", index, k, race[k])))
            }
            fd.Close()
            wg.Done()
        }(i)
    }
    wg.Wait()
    /*
        fd1, _ := os.Create("singchia")
        for _, i := range keys {
            v, ok := race[i]
            if ok {
                fd1.Write([]byte(fmt.Sprintf("key: %d, value: %d\n", i, v)))
            } else {
                fd1.Write([]byte(fmt.Sprintf("key: %d, not exists\n", i)))
            }
        }
        fd1.Close()
    */
}