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59 lines
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ReStructuredText
59 lines
2 KiB
ReStructuredText
.. image:: https://secure.travis-ci.org/python-greenlet/greenlet.png
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:target: http://travis-ci.org/python-greenlet/greenlet
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The greenlet package is a spin-off of Stackless, a version of CPython
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that supports micro-threads called "tasklets". Tasklets run
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pseudo-concurrently (typically in a single or a few OS-level threads)
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and are synchronized with data exchanges on "channels".
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A "greenlet", on the other hand, is a still more primitive notion of
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micro-thread with no implicit scheduling; coroutines, in other
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words. This is useful when you want to control exactly when your code
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runs. You can build custom scheduled micro-threads on top of greenlet;
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however, it seems that greenlets are useful on their own as a way to
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make advanced control flow structures. For example, we can recreate
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generators; the difference with Python's own generators is that our
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generators can call nested functions and the nested functions can
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yield values too. Additionally, you don't need a "yield" keyword. See
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the example in tests/test_generator.py.
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Greenlets are provided as a C extension module for the regular
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unmodified interpreter.
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Greenlets are lightweight coroutines for in-process concurrent
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programming.
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Who is using Greenlet?
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======================
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There are several libraries that use Greenlet as a more flexible
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alternative to Python's built in coroutine support:
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- `Concurrence`_
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- `Eventlet`_
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- `Gevent`_
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.. _Concurrence: http://opensource.hyves.org/concurrence/
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.. _Eventlet: http://eventlet.net/
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.. _Gevent: http://www.gevent.org/
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Getting Greenlet
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================
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The easiest way to get Greenlet is to install it with pip or
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easy_install::
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pip install greenlet
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easy_install greenlet
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Source code archives and windows installers are available on the
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python package index at https://pypi.python.org/pypi/greenlet
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The source code repository is hosted on github:
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https://github.com/python-greenlet/greenlet
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Documentation is available on readthedocs.org:
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https://greenlet.readthedocs.org
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