[issue17986] Alternative async subprocesses (pep 3145)

[STINNER Victor]

STINNER Victor added the comment:

Subprocess support of asyncio has nice features and is efficient:

- async read from stdout and stderr
- async write into stdin
- async wait for the process exit
- async communicate()
- timeout on any async operation
- support running multiple child processes in parallel
- epoll, kqueue, devpoll or IOCP selector
- On POSIX, fast child watcher waiting for SIGCHLD signal

If possible, I would prefer to not write a second "async subprocess".

It's possible to write a blocking API on top of asyncio using loop.run_until_complete().

sync_proc_asyncio.py: incomplete proof-of-concept (no working select() method).

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Added file: http://bugs.python.org/file38123/sync_proc_asyncio.py

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