Asynchronous threads in standard C++

Question

Hi, I wonder how could I implement an asynchronous call in standard C++.

I have a image/video processing program and I want to add another function/feature but I would like it to be run in a another thread or to be run asynchronously to the original thread.

I just want to notify the main thread when something happened in this new thread. (This does not happen always and there is no reason why the main thread should wait for this new process to end. Hence I prefer an asynchronous call, if that is simpler than multithread programming)

I hope I am in the right path.

Thanks in advance.

Ignacio.

UPDATE: Currently I am not using any thread library yet because up until now I didn't need it. I was thinking in Boost ... is it a good idea? Where should I start If I want to get to work some asynchronous calls?

Answer 1

The current C++ standard doesn't define such a thing, but C++0x does. That leaves a couple of choices. The cleanest is to probably use a current implementation that includes the C++ future class (and relatives). This seems to be exactly the sort of thing you're looking for. Depending on the compiler you're using, support may already be packaged (e.g., I believe it's normally included in gcc 4.5), or you might want/need to use the Boost version (though I don't believe it's part of the official Boost release -- you need to look in the vault).

Otherwise, you can do something on your own with spawning a thread pool and submitting a task to it. If you decide to, my advice would be to follow the standard interface for a future as closely as possible; it's almost inevitable that at some point you'll have futures available, and probably prefer to use them instead of maintaining your own version.