Author yselivanov
Recipients asvetlov, yselivanov
Date 2017-12-18.05:33:40
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asyncio.Task now uses asyncio.iscoroutine() to give a comprehensible error if a user creates a Task for a non-awaitable type.

The problem is that iscoroutine() is quite expensive for non-native coroutines (like the ones compiled with Cython), as it uses `isinstance(obj,` call.  This makes 'loop.create_task(cython_coroutine)' 20% slower than 'loop.create_task(python_coroutine)'.

The PR adds a positive type cache to the iscoroutine() function and to the asyncio.Task C implementation.  Both caches make 'loop.create_task()' equally fast for all kinds of coroutines.
Date User Action Args
2017-12-18 05:33:40yselivanovsetrecipients: + yselivanov, asvetlov
2017-12-18 05:33:40yselivanovsetmessageid: <>
2017-12-18 05:33:40yselivanovlinkissue32357 messages
2017-12-18 05:33:40yselivanovcreate