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    <p>Instead of using a member variable to signal that the thread is done, why not use a <a href="http://www.boost.org/doc/libs/1_36_0/doc/html/thread/synchronization.html#thread.synchronization.condvar_ref" rel="nofollow noreferrer"><code>condition</code></a>? You are already are using the boost libraries, and <a href="http://www.boost.org/doc/libs/1_36_0/doc/html/thread/synchronization.html#thread.synchronization.condvar_ref" rel="nofollow noreferrer"><code>condition</code></a> is part of the thread library.</p> <p>Check it <a href="http://www.boost.org/doc/libs/1_36_0/doc/html/thread/synchronization.html#thread.synchronization.condvar_ref" rel="nofollow noreferrer">out</a>. It allows the worker thread to 'signal' that is has finished, and the main thread can check during execution if the condition has been signaled and then do whatever it needs to do with the completed work. There are examples in the link.</p> <p>As a general case I would neve make the assumption that a resource will only be modified by the thread. You might know what it is for, however someone else might not - causing no ends of grief as the main thread thinks that the work is done and tries to access data that is not correct! It might even delete it while the worker thread is still using it, and causing the app to crash. Using a <a href="http://www.boost.org/doc/libs/1_36_0/doc/html/thread/synchronization.html#thread.synchronization.condvar_ref" rel="nofollow noreferrer"><code>condition</code></a> will help this.</p> <p>Looking at the <a href="http://www.boost.org/doc/libs/1_36_0/doc/html/thread/thread_management.html#thread.thread_management.thread" rel="nofollow noreferrer"><code>thread</code></a> documentation, you could also call <code>thread.timed_join</code> in the main thread. <code>timed_join</code> will wait for a specified amount for the thread to 'join' (join means that the thread has finsihed)</p>
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