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        "author": "Renato Cunha, Marcos Assuncao",
        "author_email": "erangb@erangbphaun.pbz, nffhapnb@npz.bet",
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            "Development Status :: 3 - Alpha",
            "Intended Audience :: Developers",
            "License :: OSI Approved :: MIT License",
            "Operating System :: MacOS :: MacOS X",
            "Operating System :: Microsoft :: Windows :: Windows 7",
            "Operating System :: Microsoft :: Windows :: Windows Server 2003",
            "Operating System :: Microsoft :: Windows :: Windows Server 2008",
            "Operating System :: Microsoft :: Windows :: Windows Vista",
            "Operating System :: Microsoft :: Windows :: Windows XP",
            "Operating System :: POSIX :: BSD :: FreeBSD",
            "Operating System :: POSIX :: BSD :: OpenBSD",
            "Operating System :: POSIX :: Linux",
            "Programming Language :: Python :: 2",
            "Programming Language :: Python :: 3",
            "Topic :: Software Development :: Libraries",
            "Topic :: System :: Operating System"
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        "description": "Process-shared Reader-Writer locks for Python\n=============================================\n\n.. image:: https://travis-ci.org/trovao/prwlock.svg\n    :target: https://travis-ci.org/trovao/prwlock\n\n.. image:: https://coveralls.io/repos/trovao/prwlock/badge.svg?branch=master&service=github\n    :target: https://coveralls.io/github/trovao/prwlock?branch=master\n\nA `reader-writer lock <https://en.wikipedia.org/wiki/Readers%E2%80%93writer_lock>`_ for\nPython that can (*must*, actually) be used for locking across multiple Python processes.\n\nThe rationale and initial implementation of the project can be found in the\n`accompanying blog post <https://renatocunha.com/blog/2015/11/ctypes-mmap-rwlock/>`_.\n\nInstallation\n------------\n\nThis package is `available on PyPi\n<https://pypi.python.org/pypi/prwlock>`_, so you can install the latest stable\nrelease with a simple `pip` call:\n\n.. code-block:: bash\n\n    $ pip install prwlock\n\nUsage\n-----\n\nAll you have to do is import the module and start using it. There is no need\nfor initialization. Therefore, a code block such as the one below is enough to\nget an RWLock instance.\n\n.. code-block:: python\n\n    from prwlock import RWLock\n\n    rwlock = RWLock()\n\nThe RWLock itself is pickleable and, therefore, can be passed around to child processes,\nsuch as in the code block below.\n\n.. code-block:: python\n\n    from __future__ import print_function\n\n    import os\n    import time\n\n    from multiprocessing import Pool\n    from prwlock import RWLock\n    def f(rwlock):\n        for i in range(2):\n            print(os.getpid(), 'Acquiring read lock')\n            rwlock.acquire_read()\n            print(os.getpid(), 'Sleeping for a while')\n            time.sleep(1)\n            print(os.getpid(), 'Releasing lock')\n            rwlock.release()\n            time.sleep(.1)\n\n    r = RWLock()\n    children = 20\n    pool = Pool(processes=children)\n    for child in range(children):\n        pool.apply_async(f, [r])\n\nContext Managers\n^^^^^^^^^^^^^^^^^\n\n`prwlock` also supports context managers using the `with` syntax. The code\nblock below displays one possible way of using it.\n\n.. code-block:: python\n\n    from prwlock import RWLock\n\n    # First you instantiate the lock\n    rwlock = RWLock()\n\n    # Now you can lock it in read or in write mode\n    with rwlock.reader_lock():\n        # If this executes, then reader lock access has been acquired\n        print('Reading data')\n\n    # Likewise, you can lock in writer mode with:\n    with rwlock.writer_lock():\n        print('Writing data')\n\nContributors\n------------\n\n * `Renato Cunha <https://renatocunha.com>`_\n * `Marcos Assun\u00e7\u00e3o <https://marcosassuncao.com>`_\n * `Vyronas Tsingaras <https://vtsingaras.me/>`_\n\nChanges\n-------\n\n* 0.4.0: Added context-management support using the `with` syntax;\n* 0.3.0: Completed the API's implementation. Namely:\n     * Added support for immediate failure when locks cannot be obtained;\n     * Added timeouts for obtaining the locks.\n* 0.2.0: Added support for RWLocks on Windows XP and above. Changed the API so\n  that the lock can be imported as `from prwlock import RWLock`, instead of the\n  slightly awkward `from prwlock.prwlock import RWLock` method.\n* 0.1.1: Fixed the value of the `PTHREAD_PROCESS_SHARED` constant for Mac OS\n  X. Also added a check to prevent double destruction of the underlying lock\n  on Mac OS X.\n* 0.1.0: Initial release",
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