fully qualified class names of Python implemented classes.

coroutine

Replace also _make_drain_waiter() function with a classic _drain_helper()
coroutine.

Replace also _make_drain_waiter() function with a classic _drain_helper()
coroutine.

when contain an id in form " at 0x...".

now display special message when and only when there are failures.

now display special message when and only when there are failures.

Fix localhost checking in FileHandler. Raised in #21970.

Thanks to William Orr.

Thanks to William Orr.

Sort also imports in support/__init__.py

Sort also imports in support/__init__.py

* Issue #19811, #22022: test_pathlib uses support.rmtree() instead of
  shutil.rmtree() to remove the temporary directory.

* Issue #19629: Fix support.rmtree(), use os.lstat() to check if the file is a
  directory, not os.path.isdir()

shutil.rmtree() to remove the temporary directory.

directory, not os.path.isdir()

ValueError on fstat() failure.

- Use _testcapi.raise_signal() in test_signal
- close also os.pipe() file descriptors in some test_signal tests where they
  were not closed properly
- Remove faulthandler._sigill() and faulthandler._sigbus(): reuse
  _testcapi.raise_signal() in test_faulthandler

symbols

For example, on Windows, it was not possible to get ProactorEventLoop or
DefaultEventLoopPolicy using "from asyncio import *".

For example, on Windows, it was not possible to get ProactorEventLoop or
DefaultEventLoopPolicy using "from asyncio import *".

Add a basic synchronization mechanism to wait until the child process is ready
before sending it a signal.

Add a basic synchronization mechanism to wait until the child process is ready
before sending it a signal.

Since Python 3.3, the C signal handler writes the signal number into the wakeup
file descriptor and then schedules the Python call using Py_AddPendingCall().

asyncio uses the wakeup file descriptor to wake up the event loop, and relies
on Py_AddPendingCall() to schedule the final callback with call_soon().

If the C signal handler is called in a thread different than the thread of the
event loop, the loop is awaken but Py_AddPendingCall() was not called yet. In
this case, the event loop has nothing to do and go to sleep again.
Py_AddPendingCall() is called while the event loop is sleeping again and so the
final callback is not scheduled immediatly.

This patch changes how asyncio handles signals. Instead of relying on
Py_AddPendingCall() and the wakeup file descriptor, asyncio now only relies on
the wakeup file descriptor. asyncio reads signal numbers from the wakeup file
descriptor to call its signal handler.