Should You Catch Exceptions Thrown by boost::asio::io_service::run()?

Should Exceptions Thrown by boost::asio::io_service::run() Be Caught?

Problem:

boost::asio::io_service::run() can throw a boost::system::system_error exception if an error occurs during execution. It's important to consider whether this exception should be handled.

Answer:

Yes, the exception should be handled.

Explanation:

As per the boost documentation, exceptions thrown from completion handlers are propagated. Therefore, exceptions thrown by run() should be handled appropriately for the specific application.

In many cases, it's recommended to loop and repeat run() until it exits without an error. This ensures continuous operation unless an unrecoverable error occurs.

Example Handling Code:

An example of handling exceptions thrown by run() in a loop:

void asio_event_loop(boost::asio::io_service& svc, std::string name) {
    while (true) {
        try {
            svc.run();
            break;
        } catch (std::exception const &e) {
            std::cout << "[eventloop] An unexpected error occurred running " << name << " task: " << e.what() << std::endl;
        } catch (...) {
            std::cout << "[eventloop] An unexpected error occurred running " << name << " task" << std::endl;
        }
    }
}

Documentation Link:

For more information, refer to the Boost documentation: 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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