问题描述

boost::asio::io_service::run() 在发生错误时抛出 boost::system::system_error 异常.我应该处理这个异常吗?如果是，怎么办?

boost::asio::io_service::run() throws a boost::system::system_error exception in case of error. Should I handle this exception? If so, how?

我的 main.cpp 代码是这样的:

my main.cpp code is something like this:

main()
{
    boost::asio::io_service queue;
    boost::asio::io_service::work work(queue);
    {
      // set some handlers...
      **queue.run();**
    }
    // join some workers...
    return 0;
}

推荐答案

是的.

据记载，完成处理程序抛出的异常会被传播.所以你需要根据你的应用来处理它们.

It is documented that exceptions thrown from completion handlers are propagated. So you need to handle them as appropriate for your application.

在许多情况下，这会循环并重复 run() 直到它没有错误地退出.

In many cases, this would be looping and repeating the run() until it exits without an error.

在我们的代码库中，我有类似的东西

In our code base I have something like

static void m_asio_event_loop(boost::asio::io_service& svc, std::string name) {
    // http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/io_service.html#boost_asio.reference.io_service.effect_of_exceptions_thrown_from_handlers
    for (;;) {
        try {
            svc.run();
            break; // exited normally
        } catch (std::exception const &e) {
            logger.log(LOG_ERR) << "[eventloop] An unexpected error occurred running " << name << " task: " << e.what();
        } catch (...) {
            logger.log(LOG_ERR) << "[eventloop] An unexpected error occurred running " << name << " task";
        }
    }
}

这里是文档链接 http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/io_service.html#boost_asio.reference.io_service.effect_of_exceptions_throw_from_handlers

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