course/sync/sync.map.go

33 lines
438 B
Go

package main
import (
"fmt"
"strconv"
"sync"
)
// GO内置的map不是并发安全的
var m = make(map[string]int)
func get(key string) int {
return m[key]
}
func set(key string, value int) {
m[key] = value
}
func main() {
wg := sync.WaitGroup{}
for i := 0; i < 10; i++ {
wg.Add(1)
go func(n int) {
key := strconv.Itoa(n)
set(key, n)
fmt.Printf("k=:%v,v:=%v\n", key, get(key))
wg.Done()
}(i)
}
wg.Wait()
}