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Edit File : queues.py \| Size : 12.37 KB
# # 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 types import weakref import errno from queue import Empty, Full 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._reset() 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._reset() def _after_fork(self): debug('Queue._after_fork()') self._reset(after_fork=True) def _reset(self, after_fork=False): if after_fork: self._notempty._at_fork_reinit() else: 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): if self._closed: raise ValueError(f"Queue {self!r} is 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 self._closed: raise ValueError(f"Queue {self!r} is closed") 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 close = self._close if close: self._close = None close() def join_thread(self): debug('Queue.join_thread()') assert self._closed, "Queue {0!r} not closed".format(self) 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 _terminate_broken(self): # Close a Queue on error. # gh-94777: Prevent queue writing to a pipe which is no longer read. self._reader.close() # gh-107219: Close the connection writer which can unblock # Queue._feed() if it was stuck in send_bytes(). if sys.platform == 'win32': self._writer.close() self.close() self.join_thread() 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._reader.close, self._writer.close, self._ignore_epipe, self._on_queue_feeder_error, self._sem), name='QueueFeederThread', daemon=True, ) try: debug('doing self._thread.start()') self._thread.start() debug('... done self._thread.start()') except: # gh-109047: During Python finalization, creating a thread # can fail with RuntimeError. self._thread = None raise 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, reader_close, writer_close, ignore_epipe, onerror, queue_sem): 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') reader_close() writer_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: # Since the object has not been sent in the queue, we need # to decrease the size of the queue. The error acts as # if the object had been silently removed from the queue # and this step is necessary to have a properly working # queue. queue_sem.release() onerror(e, obj) @staticmethod def _on_queue_feeder_error(e, obj): """ Private API hook called when feeding data in the background thread raises an exception. For overriding by concurrent.futures. """ import traceback traceback.print_exc() __class_getitem__ = classmethod(types.GenericAlias) _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): if self._closed: raise ValueError(f"Queue {self!r} is 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 close(self): self._reader.close() self._writer.close() 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) __class_getitem__ = classmethod(types.GenericAlias) Back

Edit File : queues.py | Size : 12.37 KB

#
# 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 types
import weakref
import errno

from queue import Empty, Full

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._reset()

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._reset()

def _after_fork(self):
        debug('Queue._after_fork()')
        self._reset(after_fork=True)

def _reset(self, after_fork=False):
        if after_fork:
            self._notempty._at_fork_reinit()
        else:
            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):
        if self._closed:
            raise ValueError(f"Queue {self!r} is 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 self._closed:
            raise ValueError(f"Queue {self!r} is closed")
        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
        close = self._close
        if close:
            self._close = None
            close()

def join_thread(self):
        debug('Queue.join_thread()')
        assert self._closed, "Queue {0!r} not closed".format(self)
        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 _terminate_broken(self):
        # Close a Queue on error.

# gh-94777: Prevent queue writing to a pipe which is no longer read.
        self._reader.close()

# gh-107219: Close the connection writer which can unblock
        # Queue._feed() if it was stuck in send_bytes().
        if sys.platform == 'win32':
            self._writer.close()

self.close()
        self.join_thread()

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._reader.close, self._writer.close,
                  self._ignore_epipe, self._on_queue_feeder_error,
                  self._sem),
            name='QueueFeederThread',
            daemon=True,
        )

try:
            debug('doing self._thread.start()')
            self._thread.start()
            debug('... done self._thread.start()')
        except:
            # gh-109047: During Python finalization, creating a thread
            # can fail with RuntimeError.
            self._thread = None
            raise

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, reader_close,
              writer_close, ignore_epipe, onerror, queue_sem):
        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')
                            reader_close()
                            writer_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:
                    # Since the object has not been sent in the queue, we need
                    # to decrease the size of the queue. The error acts as
                    # if the object had been silently removed from the queue
                    # and this step is necessary to have a properly working
                    # queue.
                    queue_sem.release()
                    onerror(e, obj)

@staticmethod
    def _on_queue_feeder_error(e, obj):
        """
        Private API hook called when feeding data in the background thread
        raises an exception.  For overriding by concurrent.futures.
        """
        import traceback
        traceback.print_exc()

__class_getitem__ = classmethod(types.GenericAlias)

_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:]

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 close(self):
        self._reader.close()
        self._writer.close()

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)

__class_getitem__ = classmethod(types.GenericAlias)

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