mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-05-22 21:32:31 +00:00
python-3.6.zip added from Github
README.cosmo contains the necessary links.
This commit is contained in:
ahgamut
Justine Tunney
parent
75fc601ff5
commit
0c4c56ff39
4219 changed files with 1968626 additions and 0 deletions
347
third_party/python/Lib/multiprocessing/queues.py
vendored
Normal file
347
third_party/python/Lib/multiprocessing/queues.py
vendored
Normal file
|
|
@ -0,0 +1,347 @@
|
|||
#
|
||||
# Module implementing queues
|
||||
#
|
||||
# multiprocessing/queues.py
|
||||
#
|
||||
# Copyright (c) 2006-2008, R Oudkerk
|
||||
# Licensed to PSF under a Contributor Agreement.
|
||||
#
|
||||
|
||||
__all__ = ['Queue', 'SimpleQueue', 'JoinableQueue']
|
||||
|
||||
import sys
|
||||
import os
|
||||
import threading
|
||||
import collections
|
||||
import time
|
||||
import weakref
|
||||
import errno
|
||||
|
||||
from queue import Empty, Full
|
||||
|
||||
import _multiprocessing
|
||||
|
||||
from . import connection
|
||||
from . import context
|
||||
_ForkingPickler = context.reduction.ForkingPickler
|
||||
|
||||
from .util import debug, info, Finalize, register_after_fork, is_exiting
|
||||
|
||||
#
|
||||
# Queue type using a pipe, buffer and thread
|
||||
#
|
||||
|
||||
class Queue(object):
|
||||
|
||||
def __init__(self, maxsize=0, *, ctx):
|
||||
if maxsize <= 0:
|
||||
# Can raise ImportError (see issues #3770 and #23400)
|
||||
from .synchronize import SEM_VALUE_MAX as maxsize
|
||||
self._maxsize = maxsize
|
||||
self._reader, self._writer = connection.Pipe(duplex=False)
|
||||
self._rlock = ctx.Lock()
|
||||
self._opid = os.getpid()
|
||||
if sys.platform == 'win32':
|
||||
self._wlock = None
|
||||
else:
|
||||
self._wlock = ctx.Lock()
|
||||
self._sem = ctx.BoundedSemaphore(maxsize)
|
||||
# For use by concurrent.futures
|
||||
self._ignore_epipe = False
|
||||
|
||||
self._after_fork()
|
||||
|
||||
if sys.platform != 'win32':
|
||||
register_after_fork(self, Queue._after_fork)
|
||||
|
||||
def __getstate__(self):
|
||||
context.assert_spawning(self)
|
||||
return (self._ignore_epipe, self._maxsize, self._reader, self._writer,
|
||||
self._rlock, self._wlock, self._sem, self._opid)
|
||||
|
||||
def __setstate__(self, state):
|
||||
(self._ignore_epipe, self._maxsize, self._reader, self._writer,
|
||||
self._rlock, self._wlock, self._sem, self._opid) = state
|
||||
self._after_fork()
|
||||
|
||||
def _after_fork(self):
|
||||
debug('Queue._after_fork()')
|
||||
self._notempty = threading.Condition(threading.Lock())
|
||||
self._buffer = collections.deque()
|
||||
self._thread = None
|
||||
self._jointhread = None
|
||||
self._joincancelled = False
|
||||
self._closed = False
|
||||
self._close = None
|
||||
self._send_bytes = self._writer.send_bytes
|
||||
self._recv_bytes = self._reader.recv_bytes
|
||||
self._poll = self._reader.poll
|
||||
|
||||
def put(self, obj, block=True, timeout=None):
|
||||
assert not self._closed
|
||||
if not self._sem.acquire(block, timeout):
|
||||
raise Full
|
||||
|
||||
with self._notempty:
|
||||
if self._thread is None:
|
||||
self._start_thread()
|
||||
self._buffer.append(obj)
|
||||
self._notempty.notify()
|
||||
|
||||
def get(self, block=True, timeout=None):
|
||||
if block and timeout is None:
|
||||
with self._rlock:
|
||||
res = self._recv_bytes()
|
||||
self._sem.release()
|
||||
else:
|
||||
if block:
|
||||
deadline = time.monotonic() + timeout
|
||||
if not self._rlock.acquire(block, timeout):
|
||||
raise Empty
|
||||
try:
|
||||
if block:
|
||||
timeout = deadline - time.monotonic()
|
||||
if not self._poll(timeout):
|
||||
raise Empty
|
||||
elif not self._poll():
|
||||
raise Empty
|
||||
res = self._recv_bytes()
|
||||
self._sem.release()
|
||||
finally:
|
||||
self._rlock.release()
|
||||
# unserialize the data after having released the lock
|
||||
return _ForkingPickler.loads(res)
|
||||
|
||||
def qsize(self):
|
||||
# Raises NotImplementedError on Mac OSX because of broken sem_getvalue()
|
||||
return self._maxsize - self._sem._semlock._get_value()
|
||||
|
||||
def empty(self):
|
||||
return not self._poll()
|
||||
|
||||
def full(self):
|
||||
return self._sem._semlock._is_zero()
|
||||
|
||||
def get_nowait(self):
|
||||
return self.get(False)
|
||||
|
||||
def put_nowait(self, obj):
|
||||
return self.put(obj, False)
|
||||
|
||||
def close(self):
|
||||
self._closed = True
|
||||
try:
|
||||
self._reader.close()
|
||||
finally:
|
||||
close = self._close
|
||||
if close:
|
||||
self._close = None
|
||||
close()
|
||||
|
||||
def join_thread(self):
|
||||
debug('Queue.join_thread()')
|
||||
assert self._closed
|
||||
if self._jointhread:
|
||||
self._jointhread()
|
||||
|
||||
def cancel_join_thread(self):
|
||||
debug('Queue.cancel_join_thread()')
|
||||
self._joincancelled = True
|
||||
try:
|
||||
self._jointhread.cancel()
|
||||
except AttributeError:
|
||||
pass
|
||||
|
||||
def _start_thread(self):
|
||||
debug('Queue._start_thread()')
|
||||
|
||||
# Start thread which transfers data from buffer to pipe
|
||||
self._buffer.clear()
|
||||
self._thread = threading.Thread(
|
||||
target=Queue._feed,
|
||||
args=(self._buffer, self._notempty, self._send_bytes,
|
||||
self._wlock, self._writer.close, self._ignore_epipe),
|
||||
name='QueueFeederThread'
|
||||
)
|
||||
self._thread.daemon = True
|
||||
|
||||
debug('doing self._thread.start()')
|
||||
self._thread.start()
|
||||
debug('... done self._thread.start()')
|
||||
|
||||
if not self._joincancelled:
|
||||
self._jointhread = Finalize(
|
||||
self._thread, Queue._finalize_join,
|
||||
[weakref.ref(self._thread)],
|
||||
exitpriority=-5
|
||||
)
|
||||
|
||||
# Send sentinel to the thread queue object when garbage collected
|
||||
self._close = Finalize(
|
||||
self, Queue._finalize_close,
|
||||
[self._buffer, self._notempty],
|
||||
exitpriority=10
|
||||
)
|
||||
|
||||
@staticmethod
|
||||
def _finalize_join(twr):
|
||||
debug('joining queue thread')
|
||||
thread = twr()
|
||||
if thread is not None:
|
||||
thread.join()
|
||||
debug('... queue thread joined')
|
||||
else:
|
||||
debug('... queue thread already dead')
|
||||
|
||||
@staticmethod
|
||||
def _finalize_close(buffer, notempty):
|
||||
debug('telling queue thread to quit')
|
||||
with notempty:
|
||||
buffer.append(_sentinel)
|
||||
notempty.notify()
|
||||
|
||||
@staticmethod
|
||||
def _feed(buffer, notempty, send_bytes, writelock, close, ignore_epipe):
|
||||
debug('starting thread to feed data to pipe')
|
||||
nacquire = notempty.acquire
|
||||
nrelease = notempty.release
|
||||
nwait = notempty.wait
|
||||
bpopleft = buffer.popleft
|
||||
sentinel = _sentinel
|
||||
if sys.platform != 'win32':
|
||||
wacquire = writelock.acquire
|
||||
wrelease = writelock.release
|
||||
else:
|
||||
wacquire = None
|
||||
|
||||
while 1:
|
||||
try:
|
||||
nacquire()
|
||||
try:
|
||||
if not buffer:
|
||||
nwait()
|
||||
finally:
|
||||
nrelease()
|
||||
try:
|
||||
while 1:
|
||||
obj = bpopleft()
|
||||
if obj is sentinel:
|
||||
debug('feeder thread got sentinel -- exiting')
|
||||
close()
|
||||
return
|
||||
|
||||
# serialize the data before acquiring the lock
|
||||
obj = _ForkingPickler.dumps(obj)
|
||||
if wacquire is None:
|
||||
send_bytes(obj)
|
||||
else:
|
||||
wacquire()
|
||||
try:
|
||||
send_bytes(obj)
|
||||
finally:
|
||||
wrelease()
|
||||
except IndexError:
|
||||
pass
|
||||
except Exception as e:
|
||||
if ignore_epipe and getattr(e, 'errno', 0) == errno.EPIPE:
|
||||
return
|
||||
# Since this runs in a daemon thread the resources it uses
|
||||
# may be become unusable while the process is cleaning up.
|
||||
# We ignore errors which happen after the process has
|
||||
# started to cleanup.
|
||||
if is_exiting():
|
||||
info('error in queue thread: %s', e)
|
||||
return
|
||||
else:
|
||||
import traceback
|
||||
traceback.print_exc()
|
||||
|
||||
_sentinel = object()
|
||||
|
||||
#
|
||||
# A queue type which also supports join() and task_done() methods
|
||||
#
|
||||
# Note that if you do not call task_done() for each finished task then
|
||||
# eventually the counter's semaphore may overflow causing Bad Things
|
||||
# to happen.
|
||||
#
|
||||
|
||||
class JoinableQueue(Queue):
|
||||
|
||||
def __init__(self, maxsize=0, *, ctx):
|
||||
Queue.__init__(self, maxsize, ctx=ctx)
|
||||
self._unfinished_tasks = ctx.Semaphore(0)
|
||||
self._cond = ctx.Condition()
|
||||
|
||||
def __getstate__(self):
|
||||
return Queue.__getstate__(self) + (self._cond, self._unfinished_tasks)
|
||||
|
||||
def __setstate__(self, state):
|
||||
Queue.__setstate__(self, state[:-2])
|
||||
self._cond, self._unfinished_tasks = state[-2:]
|
||||
|
||||
def put(self, obj, block=True, timeout=None):
|
||||
assert not self._closed
|
||||
if not self._sem.acquire(block, timeout):
|
||||
raise Full
|
||||
|
||||
with self._notempty, self._cond:
|
||||
if self._thread is None:
|
||||
self._start_thread()
|
||||
self._buffer.append(obj)
|
||||
self._unfinished_tasks.release()
|
||||
self._notempty.notify()
|
||||
|
||||
def task_done(self):
|
||||
with self._cond:
|
||||
if not self._unfinished_tasks.acquire(False):
|
||||
raise ValueError('task_done() called too many times')
|
||||
if self._unfinished_tasks._semlock._is_zero():
|
||||
self._cond.notify_all()
|
||||
|
||||
def join(self):
|
||||
with self._cond:
|
||||
if not self._unfinished_tasks._semlock._is_zero():
|
||||
self._cond.wait()
|
||||
|
||||
#
|
||||
# Simplified Queue type -- really just a locked pipe
|
||||
#
|
||||
|
||||
class SimpleQueue(object):
|
||||
|
||||
def __init__(self, *, ctx):
|
||||
self._reader, self._writer = connection.Pipe(duplex=False)
|
||||
self._rlock = ctx.Lock()
|
||||
self._poll = self._reader.poll
|
||||
if sys.platform == 'win32':
|
||||
self._wlock = None
|
||||
else:
|
||||
self._wlock = ctx.Lock()
|
||||
|
||||
def empty(self):
|
||||
return not self._poll()
|
||||
|
||||
def __getstate__(self):
|
||||
context.assert_spawning(self)
|
||||
return (self._reader, self._writer, self._rlock, self._wlock)
|
||||
|
||||
def __setstate__(self, state):
|
||||
(self._reader, self._writer, self._rlock, self._wlock) = state
|
||||
self._poll = self._reader.poll
|
||||
|
||||
def get(self):
|
||||
with self._rlock:
|
||||
res = self._reader.recv_bytes()
|
||||
# unserialize the data after having released the lock
|
||||
return _ForkingPickler.loads(res)
|
||||
|
||||
def put(self, obj):
|
||||
# serialize the data before acquiring the lock
|
||||
obj = _ForkingPickler.dumps(obj)
|
||||
if self._wlock is None:
|
||||
# writes to a message oriented win32 pipe are atomic
|
||||
self._writer.send_bytes(obj)
|
||||
else:
|
||||
with self._wlock:
|
||||
self._writer.send_bytes(obj)
|
||||
Loading…
Add table
Add a link
Reference in a new issue