31 lines
458 B
Go
31 lines
458 B
Go
package main
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import (
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"fmt"
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"sync"
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)
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// 互斥锁
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// 保证同一时间只有一个goroutine进入临界区，其他的goroutine在等待锁的释放，多个goroutine等待同一个锁的时候，唤醒的策略是随机的
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var x = 0
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var wg sync.WaitGroup
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var lock sync.Mutex
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func add() {
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for i := 0; i < 5000; i++ {
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lock.Lock()
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x = x + 1
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lock.Unlock()
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}
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wg.Done()
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}
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func main() {
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wg.Add(2)
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go add()
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go add()
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wg.Wait()
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fmt.Println(x)
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}
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