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40 lines
610 B
Go
40 lines
610 B
Go
package main
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import (
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"fmt"
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"sync"
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"time"
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)
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// 验证 map 的delete方法是否并发安全
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func main() {
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// 创建一个初始化的map
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m := make(map[int]int)
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for i := 0; i < 10000; i++ {
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m[i] = i
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}
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fmt.Println("map size:", len(m))
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wg := sync.WaitGroup{}
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ev := make(chan struct{}, 0)
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// 创建10个并发的goroutine，使用ev控制并发开始事件，更容易模拟data race
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for i := 0; i < 10; i++ {
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wg.Add(1)
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go func() {
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<-ev
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fmt.Println("start")
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for i := 0; i < 10000; i++ {
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delete(m, i)
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}
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wg.Done()
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}()
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}
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time.Sleep(time.Second)
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close(ev)
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wg.Wait()
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}
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