問題描述

boost::asio::io_service::run() 在出錯時拋出 boost::system::system_error 異常.我應該處理這個異常嗎?如果是，怎么辦?

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 代碼是這樣的:

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;
}

推薦答案

是.

據記載，從完成處理程序拋出的異常會被傳播.因此，您需要根據您的應用程序適當地處理它們.

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

在許多情況下，這會循環并重復 run() 直到它無錯誤退出.

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

在我們的代碼庫中，我有類似的東西

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";
        }
    }
}

這是文檔鏈接 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_thrown_from_handlers

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