cyield (C) Jurriaan Bremer 2012
Introduction
cyield is a simple implementation of the python `yield' keyword in C using the
win32 and linux pthread api (it is compatible with both x86 and x64
architectures), it uses threads which give some overhead, but due to the
simplicity of programming with so-called Generators this might be worth
considering. For more information on the `yield' keyword, see the official
python docs.
Explanation of the implementation
So, assuming the readers knows the yield keyword by now, we have to store the
state whenever a value is `returned', I could not think of a simpler method than
using another thread, because the Operating System keeps track of the stack and
registers, so all you have to do is make sure the thread executes on the right
data on the right time.
This implementation is based on an existing implementation in Objective-C using
so-called Blocks, this article can be found here:
http://www.mikeash.com/pyblog/friday-qa-2009-10-30-generators-in-objective-c.html
Examples
For three simple, but possibly realistic, examples, see main.cpp
Notes
The fact that this implementation uses threads to emulate yield makes it quite
resource-hungry in certain scenario's, such as the nested example in main.cpp
(a new thread is created, including two event objects, every iteration.)