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Issue #20400: Merge Tulip into Python: add the new asyncio.subprocess module

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* Add a new asyncio.subprocess module
* Add new create_subprocess_exec() and create_subprocess_shell() functions
* The new asyncio.subprocess.SubprocessStreamProtocol creates stream readers
  for stdout and stderr and a stream writer for stdin.
* The new asyncio.subprocess.Process class offers an API close to the
  subprocess.Popen class:

  - pid, returncode, stdin, stdout and stderr attributes
  - communicate(), wait(), send_signal(), terminate() and kill() methods

* Remove STDIN (0), STDOUT (1) and STDERR (2) constants from base_subprocess
  and unix_events, to not be confused with the symbols with the same name of
  subprocess and asyncio.subprocess modules
* _ProactorBasePipeTransport.get_write_buffer_size() now counts also the size
  of the pending write
* _ProactorBaseWritePipeTransport._loop_writing() may now pause the protocol if
  the write buffer size is greater than the high water mark (64 KB by default)
This commit is contained in:
Victor Stinner 2014-02-01 22:49:59 +01:00
parent 153d97b24e
commit 915bcb0111
9 changed files with 434 additions and 50 deletions
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8
Lib/test/test_asyncio/test_events.py
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@ -1179,14 +1179,6 @@ class EventLoopTestsMixin:
calls.append(self.loop._run_once_counter)
self.assertEqual(calls, [1, 3, 5, 6])
def test_granularity(self):
granularity = self.loop._granularity
self.assertGreater(granularity, 0.0)
# Worst expected granularity: 1 ms on Linux (limited by poll/epoll
# resolution), 15.6 ms on Windows (limited by time.monotonic
# resolution)
self.assertLess(granularity, 0.050)
class SubprocessTestsMixin: