green threading library for C on top of libuv and PyPy's stacklet

This is just an experiment, only useful to benchmark things. See gevent.h for documentation.

Python wrappers

For documentation on Python API see examples and tests in python/.

The channel performance (if it's indication of anything) is pretty good, only half as slow as Stackless (which uses soft-switching there I believe).

Testing pypy: 2.7.3 (2.2.1+dfsg-1~ppa1, Nov 28 2013, 02:02:56) [PyPy 2.2.1 with GCC 4.6.3]
+ pypy channel_comparison.py test_pypy
<module 'stackless' from '/usr/lib/pypy/lib_pypy/stackless.py'>
1000000 sends took 0.397s

Testing stackless: 2.7.6 Stackless 3.1b3 060516 (v2.7.6-slp:2f45143b8ccb, Apr 30 2014, 23:14:55)  [GCC 4.6.3]
+ stackless channel_comparison.py test_stackless
<module 'stackless' (built-in)>
1000000 sends took 0.283s

Testing /usr/bin/python: 2.7.3 (default, Feb 27 2014, 19:58:35)  [GCC 4.6.3]
+ /usr/bin/python channel_comparison.py test_gevent2
<module 'gevent2' from '/home/denis/work/libgevent/python/gevent2.so'>
1000000 sends took 0.503s

Testing /usr/bin/python: 2.7.3 (default, Feb 27 2014, 19:58:35)  [GCC 4.6.3]
+ /usr/bin/python channel_comparison.py test_gevent1
<module 'gevent' from '/usr/lib/pymodules/python2.7/gevent/__init__.pyc'> 1.0.1
1000000 sends took 17.720s