I have a thread with a class and its method that raises a "question" signal and needs to wait with a timeout for an "answer" signal.

There are several worker threads, some of which may be connected to the question signal. The answer signal will be raised by a worker thread only if it knows the answer; it is possible that no worker thread knows the answer so no answer signal will be raised  (hence need for timeout). The question thread cannot know which worker thread to ask.

What is a good way to achieve this using boost 1.58 and/or C++11? I am using g++ 4.9 on 64bit ubuntu 14.04.

Thanks,

Vic