November 2020
Intermediate to advanced
226 pages
5h 34m
Chinese
Content preview from C#并发编程经典实例（第2版）
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同步
｜
169
参阅
9.6
节探讨阻塞队列。
12.1
节探讨阻塞锁。
12.4
节探讨异步信号。
12.4
异步信号
问题
假设需要在不同部分的代码间发送通知，且接收者必须异步等待通知。
解决方案
如果只需要发送一次通知，那就使用
TaskCompletionSource<T>
异步发送。发送代码会调用
TrySetResult
，接收代码则会等待
Task
属性：
class
MyClass
{
private readonly
TaskCompletionSource<
object
> _initialized =
new
TaskCompletionSource<
object
>();
private int
_value1;
private int
_value2;
public async
Task<
int
> WaitForInitializationAsync()
{
await
_initialized.Task;
return
_value1 + _value2;
}
public void
Initialize()
{
_value1 = 13;
_value2 = 17;
_initialized.TrySetResult(
null
);
}
}
TaskCompletionSource<T>
类型可用于任何异步等待情况，在本例中就是等待来自代码另一
部分的通知。在只发送一次信号的情况下，这种方式很管用，但如果既需要开启信号，又
需要关闭信号，它就不那么好用了。 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.