boost :: asio内部线程 [英] boost::asio internal threads

问题描述

当使用boost :: asio进行一些异步TCP通信时，我注意到它启动了很多(3-4)内部线程.阅读文档，它说

When using boost::asio for some asynchronous TCP communication I noticed it starts a lot of (3-4) internal threads. Reading in the documentation, it says

"The implementation of this library for a particular platform may 
 make use of one or more internal threads to emulate asynchronicity"

现在，我的库对不启动任何额外的线程有非常严格的要求(客户端提供的线程除外，该线程现在启动io_service::run()).有什么方法可以阻止boost :: asio创建这些额外的线程?

Now my lib has very strict requirements to not start any extra threads (except one that is supplied by the client and which now starts io_service::run()). Is there any way to stop boost::asio from creating these extra threads?

或者，还有其他异步库只能在一个线程中运行吗?

Alternatively, is there any other async library out there that can run in only one thread?

推荐答案

您可以通过在相应的转换单元中定义BOOST_ASIO_DISABLE_THREADS来禁用仿真的异步操作支持. 文档的内容是这样的:

You can disable the emulated asynchronous operation support by defining BOOST_ASIO_DISABLE_THREADS in the appropriate translation units. The documentation has this to say about the definition

明确禁用Boost.Asio的线程 支持，与Boost整体是否支持无关 线程.

Explicitly disables Boost.Asio's threading support, independent of whether or not Boost as a whole supports threads.

如果找不到平台具体的实施说明，其中明确说明了哪些操作使用了此仿真.例如，我知道几乎每个平台上的async_resolve()都以这种方式进行仿真，该线程是在第一次调用async_resolve()时创建的.某些(全部?)Windows平台模拟了其他一些操作，例如deadline_timer操作.

If you didn't find the platform specific implementation notes, it clearly states which operations use this emulation. For example I know on nearly every platform async_resolve() is emulated in this fashion, the thread is created upon the first invocation of async_resolve(). Some (all?) Windows platforms emulate several other operations such as deadline_timer operations.

禁用线程支持的一种替代方法可能是避免这些模拟操作.我个人没有在项目中使用BOOST_ASIO_DISABLE_THREADS，所以不确定它是否还有其他副作用.

One alternative to disabling threading support might be to avoid these emulated operations. I personally have not used BOOST_ASIO_DISABLE_THREADS in a project so I'm unsure if it has other side effects.

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