Cancellation and Exception Handling

More or less frequently, we all get bitten by run-time errors, either in our sequential or parallel developments. To try to assuage the pain, we have learnt to capture them using error codes or a more high-level alternative like exception handling. C++, as most OO languages, supports exception handling, which, when conveniently exercised, enables the development of robust applications. Now, considering that TBB adds task-based parallelism on top of C++, it is perfectly understandable that developers should expect that exception handling is well supported. As we will see in this chapter, exception handling is indeed well and automatically supported in TBB. This means that in case of an error, perish the thought, our code can resort to an exception handler if such is available, or terminate the whole work otherwise. Implementing support in TBB was certainly nontrivial considering that