Should You Catch Exceptions Thrown by Boost.Asio's io_service::run()?

Handling Exceptions in Boost.Asio's io_service::run()

Boost.Asio's io_service::run() method plays a vital role in asynchronous event processing. However, it also raises a boost::system::system_error exception when encountering errors. The question arises whether it's advisable to catch this exception.

Should You Catch the Exception?

Yes, it is strongly recommended to handle the exception thrown by io_service::run(). As per the documentation, exceptions thrown from completion handlers are propagated. Ignoring them can lead to incorrect program behavior or termination.

How to Handle the Exception

In most cases, an appropriate approach is to loop and continue running the io_service until it exits without errors. The following code snippet provides an example:

static void asio_event_loop(boost::asio::io_service& svc, std::string name) {
    for (;;) {
        try {
            svc.run();
            break; // Exited normally
        } catch (std::exception const &e) {
            // Log error and handle appropriately
        } catch (...) {
            // Handle unknown exceptions as well
        }
    }
}

Reference Documentation

For further details, refer to the Boost.Asio documentation at:
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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