asyncio: sync with Tulip

Issue #23347: send_signal(), kill() and terminate() methods of
BaseSubprocessTransport now check if the transport was closed and if the
process exited.

Issue #23347: Refactor creation of subprocess transports. Changes on
BaseSubprocessTransport:

* Add a wait() method to wait until the child process exit
* The constructor now accepts an optional waiter parameter. The _post_init()
  coroutine must not be called explicitly anymore. It makes subprocess
  transports closer to other transports, and it gives more freedom if we want
  later to change completly how subprocess transports are created.
* close() now kills the process instead of kindly terminate it: the child
  process may ignore SIGTERM and continue to run. Call explicitly terminate()
  and wait() if you want to kindly terminate the child process.
* close() now logs a warning in debug mode if the process is still running and
  needs to be killed
* _make_subprocess_transport() is now fully asynchronous again: if the creation
  of the transport failed, wait asynchronously for the process eixt. Before the
  wait was synchronous. This change requires close() to *kill*, and not
  terminate, the child process.
* Remove the _kill_wait() method, replaced with a more agressive close()
  method. It fixes _make_subprocess_transport() on error.
  BaseSubprocessTransport.close() calls the close() method of pipe transports,
  whereas _kill_wait() closed directly pipes of the subprocess.Popen object
  without unregistering file descriptors from the selector (which caused severe
  bugs).

These changes simplifies the code of subprocess.py.

1 files changed, 18 insertions, 17 deletions

diff --git a/Lib/test/test_asyncio/test_events.py b/Lib/test/test_asyncio/test_events.py
index 12af62b..4b957d8 100644
--- a/Lib/test/test_asyncio/test_events.py
+++ b/Lib/test/test_asyncio/test_events.py
@@ -1551,9 +1551,10 @@ class SubprocessTestsMixin:
         stdin = transp.get_pipe_transport(0)
         stdin.write(b'Python The Winner')
         self.loop.run_until_complete(proto.got_data[1].wait())
-        transp.close()
+        with test_utils.disable_logger():
+            transp.close()
         self.loop.run_until_complete(proto.completed)
-        self.check_terminated(proto.returncode)
+        self.check_killed(proto.returncode)
         self.assertEqual(b'Python The Winner', proto.data[1])
 
     def test_subprocess_interactive(self):
@@ -1567,21 +1568,20 @@ class SubprocessTestsMixin:
         self.loop.run_until_complete(proto.connected)
         self.assertEqual('CONNECTED', proto.state)
 
-        try:
-            stdin = transp.get_pipe_transport(0)
-            stdin.write(b'Python ')
-            self.loop.run_until_complete(proto.got_data[1].wait())
-            proto.got_data[1].clear()
-            self.assertEqual(b'Python ', proto.data[1])
-
-            stdin.write(b'The Winner')
-            self.loop.run_until_complete(proto.got_data[1].wait())
-            self.assertEqual(b'Python The Winner', proto.data[1])
-        finally:
-            transp.close()
+        stdin = transp.get_pipe_transport(0)
+        stdin.write(b'Python ')
+        self.loop.run_until_complete(proto.got_data[1].wait())
+        proto.got_data[1].clear()
+        self.assertEqual(b'Python ', proto.data[1])
 
+        stdin.write(b'The Winner')
+        self.loop.run_until_complete(proto.got_data[1].wait())
+        self.assertEqual(b'Python The Winner', proto.data[1])
+
+        with test_utils.disable_logger():
+            transp.close()
         self.loop.run_until_complete(proto.completed)
-        self.check_terminated(proto.returncode)
+        self.check_killed(proto.returncode)
 
     def test_subprocess_shell(self):
         connect = self.loop.subprocess_shell(
@@ -1739,9 +1739,10 @@ class SubprocessTestsMixin:
             # GetLastError()==ERROR_INVALID_NAME on Windows!?!  (Using
             # WriteFile() we get ERROR_BROKEN_PIPE as expected.)
             self.assertEqual(b'ERR:OSError', proto.data[2])
-        transp.close()
+        with test_utils.disable_logger():
+            transp.close()
         self.loop.run_until_complete(proto.completed)
-        self.check_terminated(proto.returncode)
+        self.check_killed(proto.returncode)
 
     def test_subprocess_wait_no_same_group(self):
         # start the new process in a new session