C# 异步锁 await async锁,lock,Monitor,SemaphoreSlim

异步方法内无法使用Monitor 和lock
所以只能用System.Threading.SemaphoreSlim了

            //Semaphore (int initialCount, int maximumCount); //initialCount代表还分配几个线程,比如是1,那就是还能允许一个线程继续跑锁起来的代码 //maximumCount代表最大允许数,比如是1,那就是进去1个线程,就会锁起来 System.Threading.SemaphoreSlim slimlock = new SemaphoreSlim(1, 1); await slimlock.WaitAsync(); try { await Task.Delay(3000); } finally { slimlock.Release(); } 

而Monitor和lock只能用在非异步上面

//1.Monitor object lockObject= new object(); bool acquiredLock = false; try { Monitor.TryEnter(lockObject, ref acquiredLock); if (acquiredLock) { // Code that accesses resources that are protected by the lock. } else { // Code to deal with the fact that the lock was not acquired. } } finally { if (acquiredLock) { Monitor.Exit(lockObject); } } //2.Monitor lock //Monitor try { Monitor.Enter(lockObject); // Code that accesses resources that are protected by the lock. } finally { Monitor.Exit(lockObject); } //lock: lock(lockObject) { //Code that accesses resources that are protected by the lock. } 

上述2两个加锁的例子完全是等价的,都是在非异步的时候锁定某段代码

作者：牧场小明
链接：https://www.jianshu.com/p/1609c50279ac
来源：简书
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