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Name	Size	Permission	Date
2to3.rst	16.15 KB	-rw-r--r--	2024-03-19 22:46
__future__.rst	6 KB	-rw-r--r--	2024-03-19 22:46
__main__.rst	12.34 KB	-rw-r--r--	2024-03-19 22:46
_thread.rst	7.88 KB	-rw-r--r--	2024-03-19 22:46
abc.rst	12.19 KB	-rw-r--r--	2024-03-19 22:46
aifc.rst	7.48 KB	-rw-r--r--	2024-03-19 22:46
allos.rst	678 B	-rw-r--r--	2024-03-19 22:46
archiving.rst	440 B	-rw-r--r--	2024-03-19 22:46
argparse.rst	80.31 KB	-rw-r--r--	2024-03-19 22:46
array.rst	10.45 KB	-rw-r--r--	2024-03-19 22:46
ast.rst	75.95 KB	-rw-r--r--	2024-03-19 22:46
asynchat.rst	8.44 KB	-rw-r--r--	2024-03-19 22:46
asyncio-api-index.rst	4.61 KB	-rw-r--r--	2024-03-19 22:46
asyncio-dev.rst	7.31 KB	-rw-r--r--	2024-03-19 22:46
asyncio-eventloop.rst	59.33 KB	-rw-r--r--	2024-03-19 22:46
asyncio-exceptions.rst	1.7 KB	-rw-r--r--	2024-03-19 22:46
asyncio-future.rst	8.31 KB	-rw-r--r--	2024-03-19 22:46
asyncio-llapi-index.rst	14.06 KB	-rw-r--r--	2024-03-19 22:46
asyncio-platforms.rst	3.03 KB	-rw-r--r--	2024-03-19 22:46
asyncio-policy.rst	9.17 KB	-rw-r--r--	2024-03-19 22:46
asyncio-protocol.rst	31.55 KB	-rw-r--r--	2024-03-19 22:46
asyncio-queue.rst	5.5 KB	-rw-r--r--	2024-03-19 22:46
asyncio-stream.rst	14.88 KB	-rw-r--r--	2024-03-19 22:46
asyncio-subprocess.rst	11.4 KB	-rw-r--r--	2024-03-19 22:46
asyncio-sync.rst	8.84 KB	-rw-r--r--	2024-03-19 22:46
asyncio-task.rst	32.29 KB	-rw-r--r--	2024-03-19 22:46
asyncio.rst	2.63 KB	-rw-r--r--	2024-03-19 22:46
asyncore.rst	13.43 KB	-rw-r--r--	2024-03-19 22:46
atexit.rst	3.84 KB	-rw-r--r--	2024-03-19 22:46
audioop.rst	10.59 KB	-rw-r--r--	2024-03-19 22:46
audit_events.rst	2.29 KB	-rw-r--r--	2024-03-19 22:46
base64.rst	10.87 KB	-rw-r--r--	2024-03-19 22:46
bdb.rst	14.54 KB	-rw-r--r--	2024-03-19 22:46
binary.rst	654 B	-rw-r--r--	2024-03-19 22:46
binascii.rst	7.66 KB	-rw-r--r--	2024-03-19 22:46
binhex.rst	1.69 KB	-rw-r--r--	2024-03-19 22:46
bisect.rst	9.06 KB	-rw-r--r--	2024-03-19 22:46
builtins.rst	1.43 KB	-rw-r--r--	2024-03-19 22:46
bz2.rst	11.87 KB	-rw-r--r--	2024-03-19 22:46
calendar.rst	14.17 KB	-rw-r--r--	2024-03-19 22:46
cgi.rst	21.49 KB	-rw-r--r--	2024-03-19 22:46
cgitb.rst	3.75 KB	-rw-r--r--	2024-03-19 22:46
chunk.rst	5.1 KB	-rw-r--r--	2024-03-19 22:46
cmath.rst	9.42 KB	-rw-r--r--	2024-03-19 22:46
cmd.rst	13.6 KB	-rw-r--r--	2024-03-19 22:46
code.rst	7.64 KB	-rw-r--r--	2024-03-19 22:46
codecs.rst	75.37 KB	-rw-r--r--	2024-03-19 22:46
codeop.rst	3 KB	-rw-r--r--	2024-03-19 22:46
collections.abc.rst	16.73 KB	-rw-r--r--	2024-03-19 22:46
collections.rst	52.13 KB	-rw-r--r--	2024-03-19 22:46
colorsys.rst	1.77 KB	-rw-r--r--	2024-03-19 22:46
compileall.rst	13.45 KB	-rw-r--r--	2024-03-19 22:46
concurrency.rst	685 B	-rw-r--r--	2024-03-19 22:46
concurrent.futures.rst	20.76 KB	-rw-r--r--	2024-03-19 22:46
concurrent.rst	171 B	-rw-r--r--	2024-03-19 22:46
configparser.rst	49.91 KB	-rw-r--r--	2024-03-19 22:46
constants.rst	3.77 KB	-rw-r--r--	2024-03-19 22:46
contextlib.rst	34.35 KB	-rw-r--r--	2024-03-19 22:46
contextvars.rst	8.32 KB	-rw-r--r--	2024-03-19 22:46
copy.rst	3.39 KB	-rw-r--r--	2024-03-19 22:46
copyreg.rst	1.97 KB	-rw-r--r--	2024-03-19 22:46
crypt.rst	5.84 KB	-rw-r--r--	2024-03-19 22:46
crypto.rst	411 B	-rw-r--r--	2024-03-19 22:46
csv.rst	20.91 KB	-rw-r--r--	2024-03-19 22:46
ctypes.rst	90.63 KB	-rw-r--r--	2024-03-19 22:46
curses.ascii.rst	8.85 KB	-rw-r--r--	2024-03-19 22:46
curses.panel.rst	2.7 KB	-rw-r--r--	2024-03-19 22:46
curses.rst	77.03 KB	-rw-r--r--	2024-03-19 22:46
custominterp.rst	569 B	-rw-r--r--	2024-03-19 22:46
dataclasses.rst	29.22 KB	-rw-r--r--	2024-03-19 22:46
datatypes.rst	817 B	-rw-r--r--	2024-03-19 22:46
datetime.rst	101.93 KB	-rw-r--r--	2024-03-19 22:46
dbm.rst	15.05 KB	-rw-r--r--	2024-03-19 22:46
debug.rst	611 B	-rw-r--r--	2024-03-19 22:46
decimal.rst	76.21 KB	-rw-r--r--	2024-03-19 22:46
development.rst	719 B	-rw-r--r--	2024-03-19 22:46
devmode.rst	7.28 KB	-rw-r--r--	2024-03-19 22:46
dialog.rst	6.12 KB	-rw-r--r--	2024-03-19 22:46
difflib.rst	29.76 KB	-rw-r--r--	2024-03-19 22:46
dis.rst	35.33 KB	-rw-r--r--	2024-03-19 22:46
distribution.rst	452 B	-rw-r--r--	2024-03-19 22:46
distutils.rst	2.09 KB	-rw-r--r--	2024-03-19 22:46
doctest.rst	69.87 KB	-rw-r--r--	2024-03-19 22:46
email.charset.rst	7.83 KB	-rw-r--r--	2024-03-19 22:46
email.compat32-message.rst	32.89 KB	-rw-r--r--	2024-03-19 22:46
email.contentmanager.rst	8.9 KB	-rw-r--r--	2024-03-19 22:46
email.encoders.rst	2.92 KB	-rw-r--r--	2024-03-19 22:46
email.errors.rst	4.8 KB	-rw-r--r--	2024-03-19 22:46
email.examples.rst	1.87 KB	-rw-r--r--	2024-03-19 22:46
email.generator.rst	13.49 KB	-rw-r--r--	2024-03-19 22:46
email.header.rst	8.97 KB	-rw-r--r--	2024-03-19 22:46
email.headerregistry.rst	18.04 KB	-rw-r--r--	2024-03-19 22:46
email.iterators.rst	2.73 KB	-rw-r--r--	2024-03-19 22:46
email.message.rst	32.25 KB	-rw-r--r--	2024-03-19 22:46
email.mime.rst	11.45 KB	-rw-r--r--	2024-03-19 22:46
email.parser.rst	13.76 KB	-rw-r--r--	2024-03-19 22:46
email.policy.rst	26.39 KB	-rw-r--r--	2024-03-19 22:46
email.rst	6.63 KB	-rw-r--r--	2024-03-19 22:46
email.utils.rst	9.17 KB	-rw-r--r--	2024-03-19 22:46
ensurepip.rst	4.9 KB	-rw-r--r--	2024-03-19 22:46
enum.rst	35.96 KB	-rw-r--r--	2024-03-19 22:46
errno.rst	7.81 KB	-rw-r--r--	2024-03-19 22:46
exceptions.rst	29.86 KB	-rw-r--r--	2024-03-19 22:46
faulthandler.rst	6.51 KB	-rw-r--r--	2024-03-19 22:46
fcntl.rst	7.99 KB	-rw-r--r--	2024-03-19 22:46
filecmp.rst	5.89 KB	-rw-r--r--	2024-03-19 22:46
fileformats.rst	273 B	-rw-r--r--	2024-03-19 22:46
fileinput.rst	8.99 KB	-rw-r--r--	2024-03-19 22:46
filesys.rst	946 B	-rw-r--r--	2024-03-19 22:46
fnmatch.rst	3.31 KB	-rw-r--r--	2024-03-19 22:46
fractions.rst	6.2 KB	-rw-r--r--	2024-03-19 22:46
frameworks.rst	391 B	-rw-r--r--	2024-03-19 22:46
ftplib.rst	18.13 KB	-rw-r--r--	2024-03-19 22:46
functional.rst	365 B	-rw-r--r--	2024-03-19 22:46
functions.rst	84.5 KB	-rw-r--r--	2024-03-19 22:46
functools.rst	25.99 KB	-rw-r--r--	2024-03-19 22:46
gc.rst	11.16 KB	-rw-r--r--	2024-03-19 22:46
getopt.rst	6.4 KB	-rw-r--r--	2024-03-19 22:46
getpass.rst	1.84 KB	-rw-r--r--	2024-03-19 22:46
gettext.rst	27.35 KB	-rw-r--r--	2024-03-19 22:46
glob.rst	5.07 KB	-rw-r--r--	2024-03-19 22:46
graphlib.rst	8.56 KB	-rw-r--r--	2024-03-19 22:46
grp.rst	2.32 KB	-rw-r--r--	2024-03-19 22:46
gzip.rst	9.7 KB	-rw-r--r--	2024-03-19 22:46
hashlib-blake2-tree.png	10.81 KB	-rw-r--r--	2024-03-19 22:46
hashlib.rst	27.32 KB	-rw-r--r--	2024-03-19 22:46
heapq.rst	13.59 KB	-rw-r--r--	2024-03-19 22:46
hmac.rst	4.93 KB	-rw-r--r--	2024-03-19 22:46
html.entities.rst	1.31 KB	-rw-r--r--	2024-03-19 22:46
html.parser.rst	11.02 KB	-rw-r--r--	2024-03-19 22:46
html.rst	1.27 KB	-rw-r--r--	2024-03-19 22:46
http.client.rst	20.86 KB	-rw-r--r--	2024-03-19 22:46
http.cookiejar.rst	27.68 KB	-rw-r--r--	2024-03-19 22:46
http.cookies.rst	8.79 KB	-rw-r--r--	2024-03-19 22:46
http.rst	7.61 KB	-rw-r--r--	2024-03-19 22:46
http.server.rst	19.68 KB	-rw-r--r--	2024-03-19 22:46
i18n.rst	408 B	-rw-r--r--	2024-03-19 22:46
idle.rst	38.83 KB	-rw-r--r--	2024-03-19 22:46
imaplib.rst	21.42 KB	-rw-r--r--	2024-03-19 22:46
imghdr.rst	3.01 KB	-rw-r--r--	2024-03-19 22:46
imp.rst	15.15 KB	-rw-r--r--	2024-03-19 22:46
importlib.metadata.rst	12.12 KB	-rw-r--r--	2024-03-19 22:46
importlib.rst	66.95 KB	-rw-r--r--	2024-03-19 22:46
index.rst	2.37 KB	-rw-r--r--	2024-03-19 22:46
inspect.rst	59.36 KB	-rw-r--r--	2024-03-19 22:46
internet.rst	923 B	-rw-r--r--	2024-03-19 22:46
intro.rst	2.95 KB	-rw-r--r--	2024-03-19 22:46
io.rst	44.14 KB	-rw-r--r--	2024-03-19 22:46
ipaddress.rst	35.22 KB	-rw-r--r--	2024-03-19 22:46
ipc.rst	643 B	-rw-r--r--	2024-03-19 22:46
itertools.rst	42.1 KB	-rw-r--r--	2024-03-19 22:46
json.rst	28.07 KB	-rw-r--r--	2024-03-19 22:46
keyword.rst	1.12 KB	-rw-r--r--	2024-03-19 22:46
language.rst	494 B	-rw-r--r--	2024-03-19 22:46
linecache.rst	2.49 KB	-rw-r--r--	2024-03-19 22:46
locale.rst	26.03 KB	-rw-r--r--	2024-03-19 22:46
logging.config.rst	36.69 KB	-rw-r--r--	2024-03-19 22:46
logging.handlers.rst	47.53 KB	-rw-r--r--	2024-03-19 22:46
logging.rst	66.77 KB	-rw-r--r--	2024-03-19 22:46
lzma.rst	16.95 KB	-rw-r--r--	2024-03-19 22:46
mailbox.rst	61.47 KB	-rw-r--r--	2024-03-19 22:46
mailcap.rst	4.43 KB	-rw-r--r--	2024-03-19 22:46
markup.rst	679 B	-rw-r--r--	2024-03-19 22:46
marshal.rst	5.35 KB	-rw-r--r--	2024-03-19 22:46
math.rst	21.01 KB	-rw-r--r--	2024-03-19 22:46
mimetypes.rst	9.96 KB	-rw-r--r--	2024-03-19 22:46
mm.rst	331 B	-rw-r--r--	2024-03-19 22:46
mmap.rst	13.41 KB	-rw-r--r--	2024-03-19 22:46
modulefinder.rst	3.16 KB	-rw-r--r--	2024-03-19 22:46
modules.rst	381 B	-rw-r--r--	2024-03-19 22:46
msilib.rst	18.51 KB	-rw-r--r--	2024-03-19 22:46
msvcrt.rst	4.5 KB	-rw-r--r--	2024-03-19 22:46
multiprocessing.rst	108.08 KB	-rw-r--r--	2024-03-19 22:46
multiprocessing.shared_memory.rst	14.44 KB	-rw-r--r--	2024-03-19 22:46
netdata.rst	314 B	-rw-r--r--	2024-03-19 22:46
netrc.rst	3.32 KB	-rw-r--r--	2024-03-19 22:46
nis.rst	2.07 KB	-rw-r--r--	2024-03-19 22:46
nntplib.rst	21.25 KB	-rw-r--r--	2024-03-19 22:46
numbers.rst	8.09 KB	-rw-r--r--	2024-03-19 22:46
numeric.rst	696 B	-rw-r--r--	2024-03-19 22:46
operator.rst	18.84 KB	-rw-r--r--	2024-03-19 22:46
optparse.rst	75.3 KB	-rw-r--r--	2024-03-19 22:46
os.path.rst	17.4 KB	-rw-r--r--	2024-03-19 22:46
os.rst	168.21 KB	-rw-r--r--	2024-03-19 22:46
ossaudiodev.rst	17.56 KB	-rw-r--r--	2024-03-19 22:46
pathlib-inheritance.png	6.28 KB	-rw-r--r--	2024-03-19 22:46
pathlib-inheritance.svg	55.23 KB	-rw-r--r--	2024-03-19 22:46
pathlib.rst	39.66 KB	-rw-r--r--	2024-03-19 22:46
pdb.rst	20.26 KB	-rw-r--r--	2024-03-19 22:46
persistence.rst	591 B	-rw-r--r--	2024-03-19 22:46
pickle.rst	46.52 KB	-rw-r--r--	2024-03-19 22:46
pickletools.rst	3.64 KB	-rw-r--r--	2024-03-19 22:46
pipes.rst	2.72 KB	-rw-r--r--	2024-03-19 22:46
pkgutil.rst	10.26 KB	-rw-r--r--	2024-03-19 22:46
platform.rst	9.7 KB	-rw-r--r--	2024-03-19 22:46
plistlib.rst	5.32 KB	-rw-r--r--	2024-03-19 22:46
poplib.rst	8.98 KB	-rw-r--r--	2024-03-19 22:46
posix.rst	3.52 KB	-rw-r--r--	2024-03-19 22:46
pprint.rst	16.34 KB	-rw-r--r--	2024-03-19 22:46
profile.rst	29.55 KB	-rw-r--r--	2024-03-19 22:46
pty.rst	4.5 KB	-rw-r--r--	2024-03-19 22:46
pwd.rst	2.67 KB	-rw-r--r--	2024-03-19 22:46
py_compile.rst	6.52 KB	-rw-r--r--	2024-03-19 22:46
pyclbr.rst	4.45 KB	-rw-r--r--	2024-03-19 22:46
pydoc.rst	5.01 KB	-rw-r--r--	2024-03-19 22:46
pyexpat.rst	29.52 KB	-rw-r--r--	2024-03-19 22:46
python.rst	480 B	-rw-r--r--	2024-03-19 22:46
queue.rst	10 KB	-rw-r--r--	2024-03-19 22:46
quopri.rst	2.51 KB	-rw-r--r--	2024-03-19 22:46
random.rst	22.98 KB	-rw-r--r--	2024-03-19 22:46
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readline.rst	12.13 KB	-rw-r--r--	2024-03-19 22:46
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resource.rst	13 KB	-rw-r--r--	2024-03-19 22:46
rlcompleter.rst	2.24 KB	-rw-r--r--	2024-03-19 22:46
runpy.rst	8.09 KB	-rw-r--r--	2024-03-19 22:46
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security_warnings.rst	1.56 KB	-rw-r--r--	2024-03-19 22:46
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signal.rst	25.12 KB	-rw-r--r--	2024-03-19 22:46
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sqlite3.rst	66.94 KB	-rw-r--r--	2024-03-19 22:46
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stringprep.rst	4.18 KB	-rw-r--r--	2024-03-19 22:46
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subprocess.rst	57.99 KB	-rw-r--r--	2024-03-19 22:46
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telnetlib.rst	8.03 KB	-rw-r--r--	2024-03-19 22:46
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termios.rst	3.66 KB	-rw-r--r--	2024-03-19 22:46
test.rst	54.87 KB	-rw-r--r--	2024-03-19 22:46
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threading.rst	42.74 KB	-rw-r--r--	2024-03-19 22:46
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Rename

.. currentmodule:: asyncio

.. _asyncio-sync:

==========================
Synchronization Primitives
==========================

**Source code:** :source:`Lib/asyncio/locks.py`

-----------------------------------------------

asyncio synchronization primitives are designed to be similar to
those of the :mod:`threading` module with two important caveats:

* asyncio primitives are not thread-safe, therefore they should not
  be used for OS thread synchronization (use :mod:`threading` for
  that);

* methods of these synchronization primitives do not accept the *timeout*
  argument; use the :func:`asyncio.wait_for` function to perform
  operations with timeouts.

asyncio has the following basic synchronization primitives:

* :class:`Lock`
* :class:`Event`
* :class:`Condition`
* :class:`Semaphore`
* :class:`BoundedSemaphore`

---------

Lock
====

.. class:: Lock()

Implements a mutex lock for asyncio tasks.  Not thread-safe.

An asyncio lock can be used to guarantee exclusive access to a
   shared resource.

The preferred way to use a Lock is an :keyword:`async with`
   statement::

lock = asyncio.Lock()

# ... later
       async with lock:
           # access shared state

which is equivalent to::

lock = asyncio.Lock()

# ... later
       await lock.acquire()
       try:
           # access shared state
       finally:
           lock.release()

.. versionchanged:: 3.10
      Removed the *loop* parameter.

.. coroutinemethod:: acquire()

Acquire the lock.

This method waits until the lock is *unlocked*, sets it to
      *locked* and returns ``True``.

When more than one coroutine is blocked in :meth:`acquire`
      waiting for the lock to be unlocked, only one coroutine
      eventually proceeds.

Acquiring a lock is *fair*: the coroutine that proceeds will be
      the first coroutine that started waiting on the lock.

.. method:: release()

Release the lock.

When the lock is *locked*, reset it to *unlocked* and return.

If the lock is *unlocked*, a :exc:`RuntimeError` is raised.

.. method:: locked()

Return ``True`` if the lock is *locked*.

Event
=====

.. class:: Event()

An event object.  Not thread-safe.

An asyncio event can be used to notify multiple asyncio tasks
   that some event has happened.

An Event object manages an internal flag that can be set to *true*
   with the :meth:`~Event.set` method and reset to *false* with the
   :meth:`clear` method.  The :meth:`~Event.wait` method blocks until the
   flag is set to *true*.  The flag is set to *false* initially.

.. versionchanged:: 3.10
      Removed the *loop* parameter.

.. _asyncio_example_sync_event:

Example::

async def waiter(event):
          print('waiting for it ...')
          await event.wait()
          print('... got it!')

async def main():
          # Create an Event object.
          event = asyncio.Event()

# Spawn a Task to wait until 'event' is set.
          waiter_task = asyncio.create_task(waiter(event))

# Sleep for 1 second and set the event.
          await asyncio.sleep(1)
          event.set()

# Wait until the waiter task is finished.
          await waiter_task

asyncio.run(main())

.. coroutinemethod:: wait()

Wait until the event is set.

If the event is set, return ``True`` immediately.
      Otherwise block until another task calls :meth:`~Event.set`.

.. method:: set()

Set the event.

All tasks waiting for event to be set will be immediately
      awakened.

.. method:: clear()

Clear (unset) the event.

Tasks awaiting on :meth:`~Event.wait` will now block until the
      :meth:`~Event.set` method is called again.

.. method:: is_set()

Return ``True`` if the event is set.

Condition
=========

.. class:: Condition(lock=None)

A Condition object.  Not thread-safe.

An asyncio condition primitive can be used by a task to wait for
   some event to happen and then get exclusive access to a shared
   resource.

In essence, a Condition object combines the functionality
   of an :class:`Event` and a :class:`Lock`.  It is possible to have
   multiple Condition objects share one Lock, which allows coordinating
   exclusive access to a shared resource between different tasks
   interested in particular states of that shared resource.

The optional *lock* argument must be a :class:`Lock` object or
   ``None``.  In the latter case a new Lock object is created
   automatically.

.. versionchanged:: 3.10
      Removed the *loop* parameter.

The preferred way to use a Condition is an :keyword:`async with`
   statement::

cond = asyncio.Condition()

# ... later
       async with cond:
           await cond.wait()

which is equivalent to::

cond = asyncio.Condition()

# ... later
       await cond.acquire()
       try:
           await cond.wait()
       finally:
           cond.release()

.. coroutinemethod:: acquire()

Acquire the underlying lock.

This method waits until the underlying lock is *unlocked*,
      sets it to *locked* and returns ``True``.

.. method:: notify(n=1)

Wake up at most *n* tasks (1 by default) waiting on this
      condition.  The method is no-op if no tasks are waiting.

The lock must be acquired before this method is called and
      released shortly after.  If called with an *unlocked* lock
      a :exc:`RuntimeError` error is raised.

.. method:: locked()

Return ``True`` if the underlying lock is acquired.

.. method:: notify_all()

Wake up all tasks waiting on this condition.

This method acts like :meth:`notify`, but wakes up all waiting
      tasks.

The lock must be acquired before this method is called and
      released shortly after.  If called with an *unlocked* lock
      a :exc:`RuntimeError` error is raised.

.. method:: release()

Release the underlying lock.

When invoked on an unlocked lock, a :exc:`RuntimeError` is
      raised.

.. coroutinemethod:: wait()

Wait until notified.

If the calling task has not acquired the lock when this method is
      called, a :exc:`RuntimeError` is raised.

This method releases the underlying lock, and then blocks until
      it is awakened by a :meth:`notify` or :meth:`notify_all` call.
      Once awakened, the Condition re-acquires its lock and this method
      returns ``True``.

.. coroutinemethod:: wait_for(predicate)

Wait until a predicate becomes *true*.

The predicate must be a callable which result will be
      interpreted as a boolean value.  The final value is the
      return value.

Semaphore
=========

.. class:: Semaphore(value=1)

A Semaphore object.  Not thread-safe.

A semaphore manages an internal counter which is decremented by each
   :meth:`acquire` call and incremented by each :meth:`release` call.
   The counter can never go below zero; when :meth:`acquire` finds
   that it is zero, it blocks, waiting until some task calls
   :meth:`release`.

The optional *value* argument gives the initial value for the
   internal counter (``1`` by default). If the given value is
   less than ``0`` a :exc:`ValueError` is raised.

.. versionchanged:: 3.10
      Removed the *loop* parameter.

The preferred way to use a Semaphore is an :keyword:`async with`
   statement::

sem = asyncio.Semaphore(10)

# ... later
       async with sem:
           # work with shared resource

which is equivalent to::

sem = asyncio.Semaphore(10)

# ... later
       await sem.acquire()
       try:
           # work with shared resource
       finally:
           sem.release()

.. coroutinemethod:: acquire()

Acquire a semaphore.

If the internal counter is greater than zero, decrement
      it by one and return ``True`` immediately.  If it is zero, wait
      until a :meth:`release` is called and return ``True``.

.. method:: locked()

Returns ``True`` if semaphore can not be acquired immediately.

.. method:: release()

Release a semaphore, incrementing the internal counter by one.
      Can wake up a task waiting to acquire the semaphore.

Unlike :class:`BoundedSemaphore`, :class:`Semaphore` allows
      making more ``release()`` calls than ``acquire()`` calls.

BoundedSemaphore
================

.. class:: BoundedSemaphore(value=1)

A bounded semaphore object.  Not thread-safe.

Bounded Semaphore is a version of :class:`Semaphore` that raises
   a :exc:`ValueError` in :meth:`~Semaphore.release` if it
   increases the internal counter above the initial *value*.

.. versionchanged:: 3.10
      Removed the *loop* parameter.

---------

.. versionchanged:: 3.9

Acquiring a lock using ``await lock`` or ``yield from lock`` and/or
   :keyword:`with` statement (``with await lock``, ``with (yield from
   lock)``) was removed.  Use ``async with lock`` instead.