59d5404bc7
In Python 3.2 and earlier, Process.join() and Connection.poll() treated negative timeouts as zero timeouts. Earlier versions from the 3.3 line of development treat them as infinite timeouts. The patch reverts to the old behaviour.
881 lines
27 KiB
Python
881 lines
27 KiB
Python
#
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# A higher level module for using sockets (or Windows named pipes)
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#
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# multiprocessing/connection.py
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#
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# Copyright (c) 2006-2008, R Oudkerk
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# Licensed to PSF under a Contributor Agreement.
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#
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__all__ = [ 'Client', 'Listener', 'Pipe', 'wait' ]
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import io
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import os
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import sys
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import pickle
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import select
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import socket
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import struct
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import errno
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import time
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import tempfile
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import itertools
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import _multiprocessing
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from multiprocessing import current_process, AuthenticationError, BufferTooShort
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from multiprocessing.util import get_temp_dir, Finalize, sub_debug, debug
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from multiprocessing.forking import ForkingPickler
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try:
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import _winapi
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from _winapi import WAIT_OBJECT_0, WAIT_TIMEOUT, INFINITE
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except ImportError:
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if sys.platform == 'win32':
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raise
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_winapi = None
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#
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#
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#
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BUFSIZE = 8192
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# A very generous timeout when it comes to local connections...
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CONNECTION_TIMEOUT = 20.
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_mmap_counter = itertools.count()
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default_family = 'AF_INET'
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families = ['AF_INET']
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if hasattr(socket, 'AF_UNIX'):
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default_family = 'AF_UNIX'
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families += ['AF_UNIX']
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if sys.platform == 'win32':
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default_family = 'AF_PIPE'
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families += ['AF_PIPE']
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def _init_timeout(timeout=CONNECTION_TIMEOUT):
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return time.time() + timeout
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def _check_timeout(t):
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return time.time() > t
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#
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#
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#
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def arbitrary_address(family):
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'''
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Return an arbitrary free address for the given family
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'''
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if family == 'AF_INET':
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return ('localhost', 0)
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elif family == 'AF_UNIX':
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return tempfile.mktemp(prefix='listener-', dir=get_temp_dir())
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elif family == 'AF_PIPE':
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return tempfile.mktemp(prefix=r'\\.\pipe\pyc-%d-%d-' %
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(os.getpid(), next(_mmap_counter)))
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else:
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raise ValueError('unrecognized family')
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def _validate_family(family):
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'''
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Checks if the family is valid for the current environment.
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'''
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if sys.platform != 'win32' and family == 'AF_PIPE':
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raise ValueError('Family %s is not recognized.' % family)
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if sys.platform == 'win32' and family == 'AF_UNIX':
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# double check
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if not hasattr(socket, family):
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raise ValueError('Family %s is not recognized.' % family)
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def address_type(address):
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'''
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Return the types of the address
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This can be 'AF_INET', 'AF_UNIX', or 'AF_PIPE'
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'''
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if type(address) == tuple:
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return 'AF_INET'
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elif type(address) is str and address.startswith('\\\\'):
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return 'AF_PIPE'
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elif type(address) is str:
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return 'AF_UNIX'
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else:
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raise ValueError('address type of %r unrecognized' % address)
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#
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# Connection classes
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#
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class _ConnectionBase:
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_handle = None
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def __init__(self, handle, readable=True, writable=True):
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handle = handle.__index__()
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if handle < 0:
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raise ValueError("invalid handle")
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if not readable and not writable:
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raise ValueError(
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"at least one of `readable` and `writable` must be True")
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self._handle = handle
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self._readable = readable
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self._writable = writable
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# XXX should we use util.Finalize instead of a __del__?
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def __del__(self):
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if self._handle is not None:
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self._close()
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def _check_closed(self):
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if self._handle is None:
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raise IOError("handle is closed")
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def _check_readable(self):
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if not self._readable:
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raise IOError("connection is write-only")
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def _check_writable(self):
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if not self._writable:
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raise IOError("connection is read-only")
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def _bad_message_length(self):
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if self._writable:
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self._readable = False
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else:
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self.close()
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raise IOError("bad message length")
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@property
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def closed(self):
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"""True if the connection is closed"""
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return self._handle is None
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@property
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def readable(self):
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"""True if the connection is readable"""
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return self._readable
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@property
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def writable(self):
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"""True if the connection is writable"""
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return self._writable
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def fileno(self):
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"""File descriptor or handle of the connection"""
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self._check_closed()
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return self._handle
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def close(self):
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"""Close the connection"""
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if self._handle is not None:
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try:
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self._close()
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finally:
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self._handle = None
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def send_bytes(self, buf, offset=0, size=None):
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"""Send the bytes data from a bytes-like object"""
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self._check_closed()
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self._check_writable()
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m = memoryview(buf)
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# HACK for byte-indexing of non-bytewise buffers (e.g. array.array)
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if m.itemsize > 1:
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m = memoryview(bytes(m))
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n = len(m)
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if offset < 0:
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raise ValueError("offset is negative")
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if n < offset:
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raise ValueError("buffer length < offset")
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if size is None:
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size = n - offset
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elif size < 0:
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raise ValueError("size is negative")
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elif offset + size > n:
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raise ValueError("buffer length < offset + size")
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self._send_bytes(m[offset:offset + size])
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def send(self, obj):
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"""Send a (picklable) object"""
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self._check_closed()
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self._check_writable()
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buf = io.BytesIO()
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ForkingPickler(buf, pickle.HIGHEST_PROTOCOL).dump(obj)
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self._send_bytes(buf.getbuffer())
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def recv_bytes(self, maxlength=None):
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"""
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Receive bytes data as a bytes object.
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"""
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self._check_closed()
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self._check_readable()
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if maxlength is not None and maxlength < 0:
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raise ValueError("negative maxlength")
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buf = self._recv_bytes(maxlength)
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if buf is None:
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self._bad_message_length()
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return buf.getvalue()
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def recv_bytes_into(self, buf, offset=0):
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"""
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Receive bytes data into a writeable buffer-like object.
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Return the number of bytes read.
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"""
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self._check_closed()
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self._check_readable()
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with memoryview(buf) as m:
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# Get bytesize of arbitrary buffer
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itemsize = m.itemsize
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bytesize = itemsize * len(m)
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if offset < 0:
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raise ValueError("negative offset")
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elif offset > bytesize:
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raise ValueError("offset too large")
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result = self._recv_bytes()
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size = result.tell()
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if bytesize < offset + size:
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raise BufferTooShort(result.getvalue())
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# Message can fit in dest
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result.seek(0)
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result.readinto(m[offset // itemsize :
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(offset + size) // itemsize])
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return size
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def recv(self):
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"""Receive a (picklable) object"""
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self._check_closed()
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self._check_readable()
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buf = self._recv_bytes()
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return pickle.loads(buf.getbuffer())
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def poll(self, timeout=0.0):
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"""Whether there is any input available to be read"""
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self._check_closed()
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self._check_readable()
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return self._poll(timeout)
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if _winapi:
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class PipeConnection(_ConnectionBase):
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"""
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Connection class based on a Windows named pipe.
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Overlapped I/O is used, so the handles must have been created
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with FILE_FLAG_OVERLAPPED.
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"""
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_got_empty_message = False
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def _close(self, _CloseHandle=_winapi.CloseHandle):
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_CloseHandle(self._handle)
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def _send_bytes(self, buf):
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ov, err = _winapi.WriteFile(self._handle, buf, overlapped=True)
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try:
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if err == _winapi.ERROR_IO_PENDING:
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waitres = _winapi.WaitForMultipleObjects(
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[ov.event], False, INFINITE)
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assert waitres == WAIT_OBJECT_0
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except:
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ov.cancel()
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raise
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finally:
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nwritten, err = ov.GetOverlappedResult(True)
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assert err == 0
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assert nwritten == len(buf)
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def _recv_bytes(self, maxsize=None):
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if self._got_empty_message:
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self._got_empty_message = False
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return io.BytesIO()
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else:
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bsize = 128 if maxsize is None else min(maxsize, 128)
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try:
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ov, err = _winapi.ReadFile(self._handle, bsize,
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overlapped=True)
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try:
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if err == _winapi.ERROR_IO_PENDING:
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waitres = _winapi.WaitForMultipleObjects(
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[ov.event], False, INFINITE)
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assert waitres == WAIT_OBJECT_0
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except:
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ov.cancel()
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raise
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finally:
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nread, err = ov.GetOverlappedResult(True)
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if err == 0:
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f = io.BytesIO()
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f.write(ov.getbuffer())
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return f
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elif err == _winapi.ERROR_MORE_DATA:
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return self._get_more_data(ov, maxsize)
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except IOError as e:
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if e.winerror == _winapi.ERROR_BROKEN_PIPE:
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raise EOFError
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else:
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raise
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raise RuntimeError("shouldn't get here; expected KeyboardInterrupt")
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def _poll(self, timeout):
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if (self._got_empty_message or
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_winapi.PeekNamedPipe(self._handle)[0] != 0):
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return True
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return bool(wait([self], timeout))
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def _get_more_data(self, ov, maxsize):
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buf = ov.getbuffer()
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f = io.BytesIO()
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f.write(buf)
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left = _winapi.PeekNamedPipe(self._handle)[1]
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assert left > 0
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if maxsize is not None and len(buf) + left > maxsize:
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self._bad_message_length()
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ov, err = _winapi.ReadFile(self._handle, left, overlapped=True)
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rbytes, err = ov.GetOverlappedResult(True)
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assert err == 0
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assert rbytes == left
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f.write(ov.getbuffer())
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return f
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class Connection(_ConnectionBase):
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"""
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Connection class based on an arbitrary file descriptor (Unix only), or
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a socket handle (Windows).
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"""
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if _winapi:
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def _close(self, _close=_multiprocessing.closesocket):
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_close(self._handle)
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_write = _multiprocessing.send
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_read = _multiprocessing.recv
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else:
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def _close(self, _close=os.close):
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_close(self._handle)
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_write = os.write
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_read = os.read
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def _send(self, buf, write=_write):
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remaining = len(buf)
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while True:
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n = write(self._handle, buf)
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remaining -= n
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if remaining == 0:
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break
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buf = buf[n:]
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def _recv(self, size, read=_read):
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buf = io.BytesIO()
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handle = self._handle
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remaining = size
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while remaining > 0:
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chunk = read(handle, remaining)
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n = len(chunk)
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if n == 0:
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if remaining == size:
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raise EOFError
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else:
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raise IOError("got end of file during message")
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buf.write(chunk)
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remaining -= n
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return buf
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def _send_bytes(self, buf):
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# For wire compatibility with 3.2 and lower
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n = len(buf)
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self._send(struct.pack("!i", n))
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# The condition is necessary to avoid "broken pipe" errors
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# when sending a 0-length buffer if the other end closed the pipe.
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if n > 0:
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self._send(buf)
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def _recv_bytes(self, maxsize=None):
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buf = self._recv(4)
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size, = struct.unpack("!i", buf.getvalue())
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if maxsize is not None and size > maxsize:
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return None
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return self._recv(size)
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def _poll(self, timeout):
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r = wait([self._handle], timeout)
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return bool(r)
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#
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# Public functions
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#
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class Listener(object):
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'''
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Returns a listener object.
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This is a wrapper for a bound socket which is 'listening' for
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connections, or for a Windows named pipe.
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'''
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def __init__(self, address=None, family=None, backlog=1, authkey=None):
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family = family or (address and address_type(address)) \
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or default_family
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address = address or arbitrary_address(family)
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_validate_family(family)
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if family == 'AF_PIPE':
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self._listener = PipeListener(address, backlog)
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else:
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self._listener = SocketListener(address, family, backlog)
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if authkey is not None and not isinstance(authkey, bytes):
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raise TypeError('authkey should be a byte string')
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self._authkey = authkey
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def accept(self):
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'''
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Accept a connection on the bound socket or named pipe of `self`.
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Returns a `Connection` object.
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'''
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c = self._listener.accept()
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if self._authkey:
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deliver_challenge(c, self._authkey)
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answer_challenge(c, self._authkey)
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return c
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def close(self):
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'''
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Close the bound socket or named pipe of `self`.
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'''
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return self._listener.close()
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address = property(lambda self: self._listener._address)
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last_accepted = property(lambda self: self._listener._last_accepted)
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def Client(address, family=None, authkey=None):
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'''
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Returns a connection to the address of a `Listener`
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'''
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family = family or address_type(address)
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_validate_family(family)
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if family == 'AF_PIPE':
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c = PipeClient(address)
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else:
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c = SocketClient(address)
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if authkey is not None and not isinstance(authkey, bytes):
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raise TypeError('authkey should be a byte string')
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if authkey is not None:
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answer_challenge(c, authkey)
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deliver_challenge(c, authkey)
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return c
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if sys.platform != 'win32':
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def Pipe(duplex=True):
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'''
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Returns pair of connection objects at either end of a pipe
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'''
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if duplex:
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s1, s2 = socket.socketpair()
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c1 = Connection(s1.detach())
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c2 = Connection(s2.detach())
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else:
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fd1, fd2 = os.pipe()
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c1 = Connection(fd1, writable=False)
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c2 = Connection(fd2, readable=False)
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return c1, c2
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else:
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def Pipe(duplex=True):
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'''
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Returns pair of connection objects at either end of a pipe
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'''
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address = arbitrary_address('AF_PIPE')
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if duplex:
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openmode = _winapi.PIPE_ACCESS_DUPLEX
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access = _winapi.GENERIC_READ | _winapi.GENERIC_WRITE
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obsize, ibsize = BUFSIZE, BUFSIZE
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else:
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openmode = _winapi.PIPE_ACCESS_INBOUND
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access = _winapi.GENERIC_WRITE
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obsize, ibsize = 0, BUFSIZE
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h1 = _winapi.CreateNamedPipe(
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address, openmode | _winapi.FILE_FLAG_OVERLAPPED |
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_winapi.FILE_FLAG_FIRST_PIPE_INSTANCE,
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_winapi.PIPE_TYPE_MESSAGE | _winapi.PIPE_READMODE_MESSAGE |
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_winapi.PIPE_WAIT,
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1, obsize, ibsize, _winapi.NMPWAIT_WAIT_FOREVER, _winapi.NULL
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)
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h2 = _winapi.CreateFile(
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address, access, 0, _winapi.NULL, _winapi.OPEN_EXISTING,
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_winapi.FILE_FLAG_OVERLAPPED, _winapi.NULL
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)
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_winapi.SetNamedPipeHandleState(
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h2, _winapi.PIPE_READMODE_MESSAGE, None, None
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)
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overlapped = _winapi.ConnectNamedPipe(h1, overlapped=True)
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_, err = overlapped.GetOverlappedResult(True)
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assert err == 0
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c1 = PipeConnection(h1, writable=duplex)
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c2 = PipeConnection(h2, readable=duplex)
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return c1, c2
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#
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# Definitions for connections based on sockets
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#
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class SocketListener(object):
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'''
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Representation of a socket which is bound to an address and listening
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'''
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def __init__(self, address, family, backlog=1):
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self._socket = socket.socket(getattr(socket, family))
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try:
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# SO_REUSEADDR has different semantics on Windows (issue #2550).
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if os.name == 'posix':
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self._socket.setsockopt(socket.SOL_SOCKET,
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socket.SO_REUSEADDR, 1)
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self._socket.bind(address)
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self._socket.listen(backlog)
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self._address = self._socket.getsockname()
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except OSError:
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self._socket.close()
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raise
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self._family = family
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self._last_accepted = None
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if family == 'AF_UNIX':
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self._unlink = Finalize(
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|
self, os.unlink, args=(address,), exitpriority=0
|
|
)
|
|
else:
|
|
self._unlink = None
|
|
|
|
def accept(self):
|
|
s, self._last_accepted = self._socket.accept()
|
|
return Connection(s.detach())
|
|
|
|
def close(self):
|
|
self._socket.close()
|
|
if self._unlink is not None:
|
|
self._unlink()
|
|
|
|
|
|
def SocketClient(address):
|
|
'''
|
|
Return a connection object connected to the socket given by `address`
|
|
'''
|
|
family = address_type(address)
|
|
with socket.socket( getattr(socket, family) ) as s:
|
|
s.connect(address)
|
|
return Connection(s.detach())
|
|
|
|
#
|
|
# Definitions for connections based on named pipes
|
|
#
|
|
|
|
if sys.platform == 'win32':
|
|
|
|
class PipeListener(object):
|
|
'''
|
|
Representation of a named pipe
|
|
'''
|
|
def __init__(self, address, backlog=None):
|
|
self._address = address
|
|
self._handle_queue = [self._new_handle(first=True)]
|
|
|
|
self._last_accepted = None
|
|
sub_debug('listener created with address=%r', self._address)
|
|
self.close = Finalize(
|
|
self, PipeListener._finalize_pipe_listener,
|
|
args=(self._handle_queue, self._address), exitpriority=0
|
|
)
|
|
|
|
def _new_handle(self, first=False):
|
|
flags = _winapi.PIPE_ACCESS_DUPLEX | _winapi.FILE_FLAG_OVERLAPPED
|
|
if first:
|
|
flags |= _winapi.FILE_FLAG_FIRST_PIPE_INSTANCE
|
|
return _winapi.CreateNamedPipe(
|
|
self._address, flags,
|
|
_winapi.PIPE_TYPE_MESSAGE | _winapi.PIPE_READMODE_MESSAGE |
|
|
_winapi.PIPE_WAIT,
|
|
_winapi.PIPE_UNLIMITED_INSTANCES, BUFSIZE, BUFSIZE,
|
|
_winapi.NMPWAIT_WAIT_FOREVER, _winapi.NULL
|
|
)
|
|
|
|
def accept(self):
|
|
self._handle_queue.append(self._new_handle())
|
|
handle = self._handle_queue.pop(0)
|
|
try:
|
|
ov = _winapi.ConnectNamedPipe(handle, overlapped=True)
|
|
except OSError as e:
|
|
if e.winerror != _winapi.ERROR_NO_DATA:
|
|
raise
|
|
# ERROR_NO_DATA can occur if a client has already connected,
|
|
# written data and then disconnected -- see Issue 14725.
|
|
else:
|
|
try:
|
|
res = _winapi.WaitForMultipleObjects(
|
|
[ov.event], False, INFINITE)
|
|
except:
|
|
ov.cancel()
|
|
_winapi.CloseHandle(handle)
|
|
raise
|
|
finally:
|
|
_, err = ov.GetOverlappedResult(True)
|
|
assert err == 0
|
|
return PipeConnection(handle)
|
|
|
|
@staticmethod
|
|
def _finalize_pipe_listener(queue, address):
|
|
sub_debug('closing listener with address=%r', address)
|
|
for handle in queue:
|
|
_winapi.CloseHandle(handle)
|
|
|
|
def PipeClient(address):
|
|
'''
|
|
Return a connection object connected to the pipe given by `address`
|
|
'''
|
|
t = _init_timeout()
|
|
while 1:
|
|
try:
|
|
_winapi.WaitNamedPipe(address, 1000)
|
|
h = _winapi.CreateFile(
|
|
address, _winapi.GENERIC_READ | _winapi.GENERIC_WRITE,
|
|
0, _winapi.NULL, _winapi.OPEN_EXISTING,
|
|
_winapi.FILE_FLAG_OVERLAPPED, _winapi.NULL
|
|
)
|
|
except WindowsError as e:
|
|
if e.winerror not in (_winapi.ERROR_SEM_TIMEOUT,
|
|
_winapi.ERROR_PIPE_BUSY) or _check_timeout(t):
|
|
raise
|
|
else:
|
|
break
|
|
else:
|
|
raise
|
|
|
|
_winapi.SetNamedPipeHandleState(
|
|
h, _winapi.PIPE_READMODE_MESSAGE, None, None
|
|
)
|
|
return PipeConnection(h)
|
|
|
|
#
|
|
# Authentication stuff
|
|
#
|
|
|
|
MESSAGE_LENGTH = 20
|
|
|
|
CHALLENGE = b'#CHALLENGE#'
|
|
WELCOME = b'#WELCOME#'
|
|
FAILURE = b'#FAILURE#'
|
|
|
|
def deliver_challenge(connection, authkey):
|
|
import hmac
|
|
assert isinstance(authkey, bytes)
|
|
message = os.urandom(MESSAGE_LENGTH)
|
|
connection.send_bytes(CHALLENGE + message)
|
|
digest = hmac.new(authkey, message).digest()
|
|
response = connection.recv_bytes(256) # reject large message
|
|
if response == digest:
|
|
connection.send_bytes(WELCOME)
|
|
else:
|
|
connection.send_bytes(FAILURE)
|
|
raise AuthenticationError('digest received was wrong')
|
|
|
|
def answer_challenge(connection, authkey):
|
|
import hmac
|
|
assert isinstance(authkey, bytes)
|
|
message = connection.recv_bytes(256) # reject large message
|
|
assert message[:len(CHALLENGE)] == CHALLENGE, 'message = %r' % message
|
|
message = message[len(CHALLENGE):]
|
|
digest = hmac.new(authkey, message).digest()
|
|
connection.send_bytes(digest)
|
|
response = connection.recv_bytes(256) # reject large message
|
|
if response != WELCOME:
|
|
raise AuthenticationError('digest sent was rejected')
|
|
|
|
#
|
|
# Support for using xmlrpclib for serialization
|
|
#
|
|
|
|
class ConnectionWrapper(object):
|
|
def __init__(self, conn, dumps, loads):
|
|
self._conn = conn
|
|
self._dumps = dumps
|
|
self._loads = loads
|
|
for attr in ('fileno', 'close', 'poll', 'recv_bytes', 'send_bytes'):
|
|
obj = getattr(conn, attr)
|
|
setattr(self, attr, obj)
|
|
def send(self, obj):
|
|
s = self._dumps(obj)
|
|
self._conn.send_bytes(s)
|
|
def recv(self):
|
|
s = self._conn.recv_bytes()
|
|
return self._loads(s)
|
|
|
|
def _xml_dumps(obj):
|
|
return xmlrpclib.dumps((obj,), None, None, None, 1).encode('utf-8')
|
|
|
|
def _xml_loads(s):
|
|
(obj,), method = xmlrpclib.loads(s.decode('utf-8'))
|
|
return obj
|
|
|
|
class XmlListener(Listener):
|
|
def accept(self):
|
|
global xmlrpclib
|
|
import xmlrpc.client as xmlrpclib
|
|
obj = Listener.accept(self)
|
|
return ConnectionWrapper(obj, _xml_dumps, _xml_loads)
|
|
|
|
def XmlClient(*args, **kwds):
|
|
global xmlrpclib
|
|
import xmlrpc.client as xmlrpclib
|
|
return ConnectionWrapper(Client(*args, **kwds), _xml_dumps, _xml_loads)
|
|
|
|
#
|
|
# Wait
|
|
#
|
|
|
|
if sys.platform == 'win32':
|
|
|
|
def _exhaustive_wait(handles, timeout):
|
|
# Return ALL handles which are currently signalled. (Only
|
|
# returning the first signalled might create starvation issues.)
|
|
L = list(handles)
|
|
ready = []
|
|
while L:
|
|
res = _winapi.WaitForMultipleObjects(L, False, timeout)
|
|
if res == WAIT_TIMEOUT:
|
|
break
|
|
elif WAIT_OBJECT_0 <= res < WAIT_OBJECT_0 + len(L):
|
|
res -= WAIT_OBJECT_0
|
|
elif WAIT_ABANDONED_0 <= res < WAIT_ABANDONED_0 + len(L):
|
|
res -= WAIT_ABANDONED_0
|
|
else:
|
|
raise RuntimeError('Should not get here')
|
|
ready.append(L[res])
|
|
L = L[res+1:]
|
|
timeout = 0
|
|
return ready
|
|
|
|
_ready_errors = {_winapi.ERROR_BROKEN_PIPE, _winapi.ERROR_NETNAME_DELETED}
|
|
|
|
def wait(object_list, timeout=None):
|
|
'''
|
|
Wait till an object in object_list is ready/readable.
|
|
|
|
Returns list of those objects in object_list which are ready/readable.
|
|
'''
|
|
if timeout is None:
|
|
timeout = INFINITE
|
|
elif timeout < 0:
|
|
timeout = 0
|
|
else:
|
|
timeout = int(timeout * 1000 + 0.5)
|
|
|
|
object_list = list(object_list)
|
|
waithandle_to_obj = {}
|
|
ov_list = []
|
|
ready_objects = set()
|
|
ready_handles = set()
|
|
|
|
try:
|
|
for o in object_list:
|
|
try:
|
|
fileno = getattr(o, 'fileno')
|
|
except AttributeError:
|
|
waithandle_to_obj[o.__index__()] = o
|
|
else:
|
|
# start an overlapped read of length zero
|
|
try:
|
|
ov, err = _winapi.ReadFile(fileno(), 0, True)
|
|
except OSError as e:
|
|
err = e.winerror
|
|
if err not in _ready_errors:
|
|
raise
|
|
if err == _winapi.ERROR_IO_PENDING:
|
|
ov_list.append(ov)
|
|
waithandle_to_obj[ov.event] = o
|
|
else:
|
|
# If o.fileno() is an overlapped pipe handle and
|
|
# err == 0 then there is a zero length message
|
|
# in the pipe, but it HAS NOT been consumed.
|
|
ready_objects.add(o)
|
|
timeout = 0
|
|
|
|
ready_handles = _exhaustive_wait(waithandle_to_obj.keys(), timeout)
|
|
finally:
|
|
# request that overlapped reads stop
|
|
for ov in ov_list:
|
|
ov.cancel()
|
|
|
|
# wait for all overlapped reads to stop
|
|
for ov in ov_list:
|
|
try:
|
|
_, err = ov.GetOverlappedResult(True)
|
|
except OSError as e:
|
|
err = e.winerror
|
|
if err not in _ready_errors:
|
|
raise
|
|
if err != _winapi.ERROR_OPERATION_ABORTED:
|
|
o = waithandle_to_obj[ov.event]
|
|
ready_objects.add(o)
|
|
if err == 0:
|
|
# If o.fileno() is an overlapped pipe handle then
|
|
# a zero length message HAS been consumed.
|
|
if hasattr(o, '_got_empty_message'):
|
|
o._got_empty_message = True
|
|
|
|
ready_objects.update(waithandle_to_obj[h] for h in ready_handles)
|
|
return [o for o in object_list if o in ready_objects]
|
|
|
|
else:
|
|
|
|
def wait(object_list, timeout=None):
|
|
'''
|
|
Wait till an object in object_list is ready/readable.
|
|
|
|
Returns list of those objects in object_list which are ready/readable.
|
|
'''
|
|
if timeout is not None:
|
|
if timeout <= 0:
|
|
return select.select(object_list, [], [], 0)[0]
|
|
else:
|
|
deadline = time.time() + timeout
|
|
while True:
|
|
try:
|
|
return select.select(object_list, [], [], timeout)[0]
|
|
except OSError as e:
|
|
if e.errno != errno.EINTR:
|
|
raise
|
|
if timeout is not None:
|
|
timeout = deadline - time.time()
|
|
|
|
#
|
|
# Make connection and socket objects sharable if possible
|
|
#
|
|
|
|
if sys.platform == 'win32':
|
|
from . import reduction
|
|
ForkingPickler.register(socket.socket, reduction.reduce_socket)
|
|
ForkingPickler.register(Connection, reduction.reduce_connection)
|
|
ForkingPickler.register(PipeConnection, reduction.reduce_pipe_connection)
|
|
else:
|
|
try:
|
|
from . import reduction
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
ForkingPickler.register(socket.socket, reduction.reduce_socket)
|
|
ForkingPickler.register(Connection, reduction.reduce_connection)
|