如何使用boost :: asio :: io_service :: run_one（） [英] How to use boost::asio::io_service::run_one()

问题描述

我正在阅读 boost :: asio :: io_service :: run_one（），并对其功能块的含义感到困惑。

I was reading up on boost::asio::io_service::run_one() and am confused by what it means by the function block. What has been blocked and where is the handler defined?

推荐答案

我正在阅读boost： ：asio :: io_service :: run_one（），并对其功能块的含义感到困惑。被阻止的内容

I was reading up on boost::asio::io_service::run_one() and am confused by what it means by the function block. What has been blocked

被阻止的意思是 run_one（）阻止，直到完成一个

Blocked means run_one() blocks until it completes one handler.

在哪里定义处理程序？

and where is the handler defined?

不是。 在逻辑上在文档中进行了描述。处理程序是服务中待处理的任何操作。因此，如果您这样做：

It isn't. Logically it's described in the documentation. A handler is whatever action is pending in the service. So, if you do:

 void foo() { /*.... */ }
 void bar() { /*.... */ }

 io_service svc;
 svc.post(foo);
 svc.post(bar);

现在第一次拨打电话

 svc.run_one();

阻塞直到 foo 完成。

 svc.run_one();

将阻塞，直到 bar 完成。之后， run_one（）将不会阻塞，仅返回0。如果使该服务保持不变，例如：

will block until bar is completed. After that, run_one() will NOT block and just return 0. If you make the service stay around, e.g.:

 io_service::work keep_around(svc);
 svc.run_one();

在执行其他操作之前将一直处于阻止状态。

would block until some other action was posted.

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