如何获取另一个线程的ThreadStatic值? [英] How to get ThreadStatic value of another thread?

问题描述

是否有可能给定Thread引用以获取该线程的ThreadStatic值?

Is it possible given the Thread reference to get ThreadStatic value for that thread?

推荐答案

否，这是不可能的.与此类属性一样，[ThreadStatic]属性可被抖动识别.它生成对CLR的调用，以获得指向类的线程本地存储的指针.此帮助程序方法有多种版本，基本的是JIT_GetSharedGCThreadStaticBase().但是对于通用类来说，它变得更加复杂，例如，它可以基于类型参数具有多个静态变量. helper函数采用两个不明显的参数，即模块ID和类ID.这些ID取决于加载代码的AppDomain.

No, that's not possible. As common with attributes like this one, the [ThreadStatic] attribute is recognized by the jitter. It generates a call into the CLR to obtain a pointer to the thread-local storage for a class. There are multiple versions of this helper method, the basic one is JIT_GetSharedGCThreadStaticBase(). But it gets more convoluted for a generic class for example, it can have multiple static variables based on the type parameter. The helper function takes two non-obvious arguments, the module ID and the class ID. Those IDs depend on the AppDomain in which the code was loaded.

长话短说，您没有机会进行相同的调用，帮助方法甚至也没有获取线程ID，这是调用上下文所隐含的.

Long story short, you don't stand a chance to make this same call, nor does the helper method even take the thread ID, it is implied by the call context.

您可以使用Thread.AllocateNamedDataSlot()将任意数据挂起在线程外.但是请注意，它是静态方法，也不使用线程ID，它还是基于调用上下文.

You can hang arbitrary data off a thread with Thread.AllocateNamedDataSlot(). But note that it is static method and doesn't take a thread ID either, it is again based on the call context.

这都是故意的.线程本地存储的一个很好的特性是它始终是线程安全的.允许从另一个线程访问它的后门将完全破坏该功能.如果您想这样做，那会让您非常担心.例如，您可以使用以ManagedThreadId为关键字的自己的查找表.

This is all quite intentional. A very nice property of thread-local storage is that it is always thread-safe. A backdoor that would permit accessing it from another thread would completely destroy that feature. Something that should worry you a great deal if you want to do this. You could, with, say, your own lookup table that's keyed by the ManagedThreadId.

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