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        "description": "Introduction\n============\n\n``SystemEvent`` provides a simple synchronization primitive for use across multiple\nprocesses. The ``SystemEvent`` object emulates the ``threading.Event`` API exactly. In\naddition, simple scripts (``evt_set``, ``evt_wait``, and ``evt_clear``) are installed for\neasy usage from shell scripts.\n\nThe main reason to use ``SystemEvent`` is in situations when you want processes to wait\non other processes without the need for polling.\n\nInstallation\n============\n\n``pip install SystemEvent``\n\nUsage\n=====\n\n``SystemEvent`` uses named posix semaphores under the hood, so you need to choose event\nnames that are unique to your application. Any event references will use this unique name.\n\n>From Python, use it *exactly* like you would use a ``threading.Event`` instances, with the\nmain difference being that you need to give your event a name so that other processes can\nreference it.\n\nFor example, in as many consoles as you like, set up an event and have it wait (the last\nline will block on each ```wait()`` call):\n\n    >>> import SystemEvent\n    >>> evt = SystemEvent.SystemEvent(\"my_event\")\n    >>> evt.wait()\n\nAlternatively, you can just run ``evt_wait my_event`` from your favorite shell (this is\njust a small script that does the above almost exactly).\n\nIn another console, set the event and note that the first event releases:\n\n    >>> import SystemEvent\n    >>> evt = SystemEvent.SystemEvent(\"my_event\")\n    >>> evt.set()\n\nAll events blocking on \"my_event\" will be immediately released by this ``set()`` call.\nSubsequent calls to ``evt.wait()`` from any process will not block, since the event is now\nglobally latched.\n\nTo clear the event (so that calls to ``evt.wait()`` will block again), call\n``evt.clear()``.\n\nAs with ``threading.Event`` (and ``multiprocessing.Event``) there is also an ``isSet()``\nmethod which tells you the current state (but watch out for race conditions when checking\nit).\n\nShell scripts\n=============\n\nThree shell scripts are provided, with the following usage:\n\n    evt_wait <event_name> [timeout_s]\n\n    evt_set <event_name>\n\n    evt_clear <event_name>\n\nThese scripts are thin shells over ``SystemEvent`` usage. The ``timeout_s`` option on\n``evt_wait`` is optional, and defaults to infinity.\n\nAll scripts have an exit code of 0, unless ``evt_wait`` times out, in which case it\nreturns 1.\n\nHow does it work?\n=================\n\n``SystemEvent`` currently uses a posix semaphore internally. To integrate with other\nnon-python applications, you can just access the same named semaphore. Just be careful\nthat you increment and decrement correctly. Check out the code for details... it is\nridiculously small.\n\nLicense\n=======\nMIT.  See ``LICENSE`` file.\n\nTODO\n====\n\n1. Add tests\n2. Make it work in Windows, too\n3. Remove the ``posix_ipc`` requirement\n\n\n\n",
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        "name": "SystemEvent",
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