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        "author": "Rob Blackbourn",
        "author_email": "rob.blackbourn@gmail.com",
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            "License :: OSI Approved :: Apache Software License",
            "Programming Language :: Python :: 3",
            "Programming Language :: Python :: 3.7"
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        "description": "# countdown-event\n\nA synchronization class which blocks when the count is not zero.\n\nHere's an example\n\n```python\nimport asyncio\nfrom countdown_event import CountdownEvent\n\nasync def long_running_task(countdown_event,cancellation_event):\n    count = countdown_event.increment()\n    print(f'incremented count to {count}')\n    try:\n        print('Waiting for cancellation event')\n        await cancellation_event.wait()\n    finally:\n        count = countdown_event.decrement()\n        print(f'decremented count to {count}')\n\nasync def stop_tasks(secs, countdown_event, cancellation_event):\n    print(f'waiting {secs} seconds before setting the cancellation event')\n    await asyncio.sleep(secs)\n    print('setting the cancellation event')\n    cancellation_event.set()\n    print('waiting for tasks to finish')\n    await countdown_event.wait()\n    print('countdown event cleared')\n\nasync def main_async():\n    cancellation_event = asyncio.Event()\n    countdown_event = CountdownEvent()\n    tasks = [\n        long_running_task(countdown_event, cancellation_event),\n        long_running_task(countdown_event, cancellation_event),\n        long_running_task(countdown_event, cancellation_event),\n        stop_tasks(5, countdown_event, cancellation_event)\n    ]\n    await asyncio.wait(tasks)\n    assert countdown_event.count == 0\n    print(\"done\")\n\nif __name__ == \"__main__\":\n    asyncio.run(main_async())\n```\n\nHere's the output.\n\n```\nincremented count to 1\nWaiting for cancellation event\nincremented count to 2\nWaiting for cancellation event\nwaiting 5 seconds before setting the cancellation event\nincremented count to 3\nWaiting for cancellation event\nsetting the cancellation event\nwaiting for tasks to finish\ndecremented count to 2\ndecremented count to 1\ndecremented count to 0\ncountdown event cleared\ndone\n```",
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        "license": "Apache-2.0",
        "maintainer": "Rob Blackbourn",
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