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    <p>If I understand your problem, you have a C++ program that calls into python. When python finishes executing a function, you want to pause the interpreter and pick up where the C++ code left off. Some time later your C++ program needs to cal back into python, and have the python interpreter pick up where it left off.</p> <p>I don't think you can do this very easily with one thread. Before you pause the interpreter the stack looks like this:</p> <pre><code>[ top of stack ] [ some interpreter frames ] [ some c++ frames ] </code></pre> <p>To pause the interpreter, you need to save off the interpreter frames, and jump back to the top-most C++ frame. Then to unpause, you need to restore the interpreter frames, and jump up the stack to where you left off. Jumping is doable (see <a href="http://en.wikipedia.org/wiki/Setjmp.h" rel="nofollow">http://en.wikipedia.org/wiki/Setjmp.h</a>), but saving and restoring the stack is harder. I don't know of an API to do this.</p> <p>However you could do this with two threads. The thread created at the start of your c++ program (call it thread 1) runs the c++ code, and it creates thread 2 to run the python interpreter.</p> <p>Initially (when were running c++ code), thread 1 is executing and thread 2 is blocked (say on a condition variable, see <a href="https://computing.llnl.gov/tutorials/pthreads/" rel="nofollow">https://computing.llnl.gov/tutorials/pthreads/</a>). When you run or unpause the interpreter thread 1 signals the condition variable, and waits on it. This wakes up thread 2 (which runs the interpreter) and causes thread 1 to block. When the interpreter needs to pause, thread 2 signals the condition variable and waits on it (so thread 2 blocks, thread 1 wakes up). You can bounce back and forth between the threads to your heart's content. Hope this helps.</p>
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    1. COThanks! I just googled the vocab in your answer that I didn't understand, so now I get what you mean. Worked like a charm.
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