29 lines
500 B
Go
29 lines
500 B
Go
package main
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import (
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"fmt"
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"sync"
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"sync/atomic"
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)
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var a int64 //并发修改a变量的值，可能会导致数字错误
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var WG sync.WaitGroup
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//var mLock sync.Mutex //方法1,添加互斥锁
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func main() {
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for i := 0; i < 1000; i++ {
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WG.Add(1)
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go func() {
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//mLock.Lock() //加锁
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//a++ //加法操作
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atomic.AddInt64(&a, 1) //传递全局变量指针,和要加的值,默认就是加锁和释放锁
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//mLock.Unlock() //解锁
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WG.Done()
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}()
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}
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WG.Wait()
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fmt.Println(a)
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}
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