Handling exceptions from thread functions

In the first recipe, we introduced the thread support library and saw how to do some basic operations with threads. In that recipe, we briefly discussed exception handling in thread functions and mentioned that exceptions cannot be caught with a try…catch statement in the context where the thread was started. On the other hand, exceptions can be transported between threads within a std::exception_ptr wrapper. In this recipe, we will see how to handle exceptions from thread functions.

Getting ready

You are now familiar with the thread operations we discussed in the previous recipe, Working with threads. The exception_ptr class is available in the std namespace, which is in the <exception> header; mutex (which we discussed in more detail previously) is also available in the same namespace but in the <mutex> header.

How to do it...

To properly handle exceptions thrown in a worker thread from the main thread...