How Can I Handle Exceptions Thrown by Boost::ASIO's io_service::run()?

Handling Exceptions from Boost::ASIO's io_service::run() Method

Boost::ASIO's io_service::run() method can throw various types of exceptions, including boost::system::system_error in case of an error. It's crucial to handle these exceptions appropriately to avoid unexpected termination of your application.

Why Handle Exceptions?

Exceptions from completion handlers are propagated to run(). This means that any error that occurs during the execution of a completion handler will be forwarded to run(). Therefore, it's essential to handle these exceptions to ensure that your application can respond appropriately or continue operation if possible.

How to Handle Exceptions

One common approach for handling exceptions from run() is to use a try-catch block. In this block, you can capture the exception and make a decision based on the error type. For example, if you encounter a std::bad_alloc exception, you may choose to terminate your application with an error message. Alternatively, for non-critical errors, you could log the error and attempt to continue the run() loop.

Sample Code

The following code snippet illustrates how to catch and handle exceptions thrown from run():

try {
  boost::asio::io_service queue;
  boost::asio::io_service::work work(queue);
  {
    // set some handlers...
    queue.run();
  }
  // join some workers...
} catch (std::exception& e) {
  // Handle the exception based on its type
  ...
} catch (...) {
  // Handle unknown exceptions
  ...
}

Documentation Link

For further details on the effect of exceptions thrown from handlers, refer to the Boost.ASIO 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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