def write(self, buf, full=False, timeout=None):
"""Write data in 'buf' to file. If 'full' is True, the function
waits till all data in buf is written; otherwise, it waits
until one write completes. It returns length of data written.
If no data has been written before timeout, then
IOError('timedout') will be thrown.
If timeout is given and full is True and timeout expires
before all the data could be written, it returns length of
data written before timeout if any data has been written.
Must be used with 'yield' as
'n = yield fd.write(buf)' to write (some) data in buf.
"""
def _write(view, written):
try:
n = os.write(self._fileno, view)
except (OSError, IOError) as exc:
if exc.errno in (errno.EAGAIN, errno.EINTR):
n = 0
else:
self._notifier.clear(self, _AsyncPoller._Write)
if full:
view.release()
self._write_task.throw(*sys.exc_info())
self._write_task = self._write_fn = None
return
written += n
if n == len(view) or not full:
self._notifier.clear(self, _AsyncPoller._Write)
if full:
view.release()
self._write_task._proceed_(written)
self._write_task = self._write_fn = None
else:
view = view[n:]
self._write_fn = partial_func(_write, view, written)
if not self._pycos:
self._pycos = Pycos.scheduler()
self._notifier = self._pycos._notifier
if hasattr(self._fd, '_fileno'):
self._notifier.unregister(self._fd)
if full:
view = memoryview(buf)
else:
view = buf
self._timeout = timeout
self._write_task = Pycos.cur_task(self._pycos)
self._write_task._await_()
self._write_fn = partial_func(_write, view, 0)
self._notifier.add(self, _AsyncPoller._Write)
def write(self, buf, full=False, timeout=None):
"""Write data in 'buf' to file. If 'full' is True, the function
waits till all data in buf is written; otherwise, it waits
until one write completes. It returns length of data written.
If no data has been written before timeout, then
IOError('timedout') will be thrown.
If timeout is given and full is True and timeout expires
before all the data could be written, it returns length of
data written before timeout if any data has been written.
Must be used with 'yield' as
'n = yield fd.write(buf)' to write (some) data in buf.
"""
def _write(view, written):
try:
n = os.write(self._fileno, view)
except (OSError, IOError) as exc:
if exc.errno in (errno.EAGAIN, errno.EINTR):
n = 0
else:
self._notifier.clear(self, _AsyncPoller._Write)
self._write_task.throw(*sys.exc_info())
self._write_task = self._write_fn = None
return
written += n
if n == len(view) or not full:
self._notifier.clear(self, _AsyncPoller._Write)
self._write_task._proceed_(written)
self._write_task = self._write_fn = None
else:
view = view[n:]
self._write_fn = partial_func(_write, view, written)
if not self._pycos:
self._pycos = Pycos.scheduler()
self._notifier = self._pycos._notifier
if hasattr(self._fd, '_fileno'):
self._notifier.unregister(self._fd)
if full:
view = buffer(buf)
else:
view = buf
self._timeout = timeout
self._write_task = Pycos.cur_task(self._pycos)
self._write_task._await_()
self._write_fn = partial_func(_write, view, 0)
self._notifier.add(self, _AsyncPoller._Write)
def __init__(self, fd):
"""'fd' is either a file object (e.g., obtained with 'open')
or a file number (e.g., obtained with socket's fileno()).
"""
if hasattr(fd, 'fileno'):
self._fd = fd
self._fileno = fd.fileno()
elif isinstance(fd, int):
self._fd, self._fileno = None, self._fd
else:
raise ValueError('invalid file descriptor')
self._pycos = Pycos.scheduler()
if self._pycos:
self._notifier = self._pycos._notifier
if hasattr(fd, '_fileno'): # assume it is AsyncSocket
self._notifier.unregister(fd)
else:
self._notifier = None
self._timeout = None
self._read_task = None
self._read_fn = None
self._write_task = None
self._write_fn = None
self._buflist = []
self._event = None
flags = fcntl.fcntl(self._fileno, fcntl.F_GETFL)
fcntl.fcntl(self._fileno, fcntl.F_SETFL, flags | os.O_NONBLOCK)
def __init__(self, fd):
"""'fd' is either a file object (e.g., obtained with 'open')
or a file number (e.g., obtained with socket's fileno()).
"""
if hasattr(fd, 'fileno'):
self._fd = fd
self._fileno = fd.fileno()
elif isinstance(fd, int):
self._fd, self._fileno = None, self._fd
else:
raise ValueError('invalid file descriptor')
self._pycos = Pycos.scheduler()
if self._pycos:
self._notifier = self._pycos._notifier
if hasattr(fd, '_fileno'): # assume it is AsyncSocket
self._notifier.unregister(fd)
else:
self._notifier = None
self._timeout = None
self._read_task = None
self._read_fn = None
self._write_task = None
self._write_fn = None
self._buflist = []
flags = fcntl.fcntl(self._fileno, fcntl.F_GETFL)
fcntl.fcntl(self._fileno, fcntl.F_SETFL, flags | os.O_NONBLOCK)
def read(self, size=0, full=False, timeout=None):
"""Read at most 'size' bytes from file; if 'size' <= 0,
all data up to EOF is read and returned. If 'full' is
True, exactly 'size' bytes are returned (unless EOF or
timeout occur before). If EOF is encountered before any
more data is available, empty buffer is returned.
If no data has been read before timeout, then
IOError('timedout') will be thrown.
If timeout is given and full is True and timeout expires
before all the data could be read, it returns partial data
read before timeout if any data has been read.
Must be used in a task with 'yield' as
'data = yield fd.read(1024)'
"""
def _read(size, full):
if size > 0:
count = size
else:
count = 16384
try:
buf = os.read(self._fileno, count)
except (OSError, IOError) as exc:
if exc.errno in (errno.EAGAIN, errno.EWOULDBLOCK):
return
else:
raise
except Exception:
self._notifier.clear(self, _AsyncPoller._Read)
self._read_task.throw(*sys.exc_info())
self._read_task = self._read_fn = None
return
if buf:
if size > 0:
size -= len(buf)
# assert size >= 0
if size == 0:
full = False
self._buflist.append(buf)
if full:
self._read_fn = partial_func(_read, size, full)
return
if self._buflist:
buf, self._buflist = ''.join(self._buflist), []
self._notifier.clear(self, _AsyncPoller._Read)
self._read_task._proceed_(buf)
self._read_task = self._read_fn = None
if not self._pycos:
self._pycos = Pycos.scheduler()
self._notifier = self._pycos._notifier
if hasattr(self._fd, '_fileno'):
self._notifier.unregister(self._fd)
if not size or size < 0:
size = 0
full = True
elif self._buflist:
buf, self._buflist = ''.join(self._buflist), []
if len(buf) > size:
buf, self._buflist = buf[:size], [buf[size:]]
if (not full) or (len(buf) == size):
return buf
self._buflist = [buf]
size -= len(buf)
self._timeout = timeout
self._read_task = Pycos.cur_task(self._pycos)
self._read_task._await_()
self._read_fn = partial_func(_read, size, full)
self._notifier.add(self, _AsyncPoller._Read)
def write(self, buf, full=False, timeout=None):
"""Write data in 'buf' to file. If 'full' is True, the function
waits till all data in buf is written; otherwise, it waits
until one write completes. It returns length of data written.
If no data has been written before timeout, then
IOError('timedout') will be thrown.
If timeout is given and full is True and timeout expires
before all the data could be written, it returns length of
data written before timeout if any data has been written.
Must be used with 'yield' as
'n = yield fd.write(buf)' to write (some) data in buf.
"""
def _write(written, rc, n):
if rc or n == 0:
if self._timeout:
self._notifier._del_timeout(self)
if rc != winerror.ERROR_OPERATION_ABORTED:
if written:
self._write_task._proceed_(written)
else:
self._write_task.throw(IOError(rc, 'WriteFile', str(rc)))
self._overlap.object = self._write_task = self._write_result = None
return
written += n
self._overlap.Offset += n
self._write_result = self._write_result[n:]
if not full or len(self._write_result) == 0:
self._overlap.object = self._write_result = None
if self._timeout:
self._notifier._del_timeout(self)
self._write_task._proceed_(written)
self._write_task = None
return
self._overlap.object = partial_func(_write, written)
try:
rc, _ = win32file.WriteFile(self._handle, self._write_result, self._overlap)
except pywintypes.error as exc:
rc = exc.winerror
if rc and rc != winerror.ERROR_IO_PENDING:
self._overlap.object = self._write_result = None
if self._timeout:
self._notifier._del_timeout(self)
if written:
self._write_task._proceed_(written)
else:
self._write_task.throw(IOError(rc, 'WriteFile', str(rc)))
self._write_task = None
return
self._write_result = buffer(buf)
self._overlap.object = partial_func(_write, 0)
if not self._pycos:
self._pycos = Pycos.scheduler()
self._notifier = self._pycos._notifier
self._notifier.register(self._handle)
self._write_task = Pycos.cur_task(self._pycos)
self._write_task._await_()
try:
rc, _ = win32file.WriteFile(self._handle, self._write_result, self._overlap)
except pywintypes.error as exc:
if exc.winerror == winerror.ERROR_BROKEN_PIPE:
self._write_task._proceed_(0)
self._write_result = self._write_task = self._overlap.object = None
return
else:
rc = exc.winerror
if rc and rc != winerror.ERROR_IO_PENDING:
self._overlap.object = self._write_result = self._write_task = None
self._write_task._proceed_(None)
raise IOError(rc, 'WriteFile', str(rc))
if timeout:
self._timeout = timeout
self._notifier._add_timeout(self)
def read(self, size=0, full=False, timeout=None):
"""Read at most 'size' bytes from file; if 'size' <= 0,
all data up to EOF is read and returned. If 'full' is
True, exactly 'size' bytes are returned (unless EOF or
timeout occur before). If EOF is encountered before any
more data is available, empty buffer is returned.
If no data has been read before timeout, then
IOError('timedout') will be thrown.
If timeout is given and full is True and timeout expires
before all the data could be read, it returns partial data
read before timeout if any data has been read.
Must be used in a task with 'yield' as
'data = yield fd.read(1024)'
"""
def _read(size, full, rc, n):
if rc or n == 0:
if self._timeout:
self._notifier._del_timeout(self)
self._overlap.object = self._read_result = None
if rc != winerror.ERROR_OPERATION_ABORTED:
if (self._buflist or rc == winerror.ERROR_HANDLE_EOF or
rc == winerror.ERROR_BROKEN_PIPE):
buf, self._buflist = ''.join(self._buflist), []
self._read_task._proceed_(buf)
return
self._read_task.throw(IOError(rc, 'ReadFile', str(rc)))
self._overlap.object = self._read_task = self._read_result = None
return
buf = self._read_result[:n]
if size > 0:
size -= len(buf)
assert size >= 0
if size == 0:
full = False
self._buflist.append(buf)
self._overlap.Offset += n
if full:
self._overlap.object = partial_func(_read, size, full)
try:
rc, _ = win32file.ReadFile(self._handle, self._read_result, self._overlap)
except pywintypes.error as exc:
rc = exc.winerror
if rc and rc != winerror.ERROR_IO_PENDING:
buf, self._buflist = ''.join(self._buflist), []
self._overlap.object = self._read_result = None
if self._timeout:
self._notifier._del_timeout(self)
self._read_task._proceed_(buf)
self._read_task = None
return
if self._buflist:
buf, self._buflist = ''.join(self._buflist), []
if self._timeout:
self._notifier._del_timeout(self)
self._overlap.object = self._read_result = None
self._read_task._proceed_(buf)
self._read_task = None
if not self._pycos:
self._pycos = Pycos.scheduler()
self._notifier = self._pycos._notifier
self._notifier.register(self._handle)
if not size or size < 0:
count = 16384
full = True
else:
if self._buflist:
buf, self._buflist = ''.join(self._buflist), []
if len(buf) > size:
buf, self._buflist = buf[:size], [buf[size:]]
if (not full) or (len(buf) == size):
return buf
self._buflist = [buf]
size -= len(buf)
count = size
self._read_result = win32file.AllocateReadBuffer(count)
self._overlap.object = partial_func(_read, size, full)
self._read_task = Pycos.cur_task(self._pycos)
self._read_task._await_()
try:
rc, _ = win32file.ReadFile(self._handle, self._read_result, self._overlap)
except pywintypes.error as exc:
if exc.winerror == winerror.ERROR_BROKEN_PIPE:
buf, self._buflist = ''.join(self._buflist), []
self._read_task._proceed_(buf)
self._read_result = self._read_task = self._overlap.object = None
return
else:
rc = exc.winerror
if rc and rc != winerror.ERROR_IO_PENDING:
self._overlap.object = self._read_result = self._read_task = None
self._read_task.throw(IOError(rc, 'ReadFile', str(rc)))
if timeout:
self._timeout = timeout
self._notifier._add_timeout(self)
def __init__(self, path_handle, mode='r', share=None):
"""If 'path_handle' is a string, opens that file for
asynchronous I/O; if it is a handle (pipe client / server,
for example), sets up for asynchronous I/O. 'mode' is as
per 'open' Python function, although limited to
basic/common modes.
"""
self._overlap = pywintypes.OVERLAPPED()
if isinstance(path_handle, str):
self._path = path_handle
if mode.startswith('r'):
access = win32file.GENERIC_READ
if share is None:
share = win32con.FILE_SHARE_READ | win32con.FILE_SHARE_WRITE
create = win32file.OPEN_EXISTING
if '+' in mode:
access |= win32file.GENERIC_WRITE
elif mode.startswith('w'):
access = win32file.GENERIC_WRITE
if share is None:
share = win32con.FILE_SHARE_READ | win32con.FILE_SHARE_WRITE
create = win32file.CREATE_ALWAYS
if '+' in mode:
access |= win32file.GENERIC_READ
elif mode.startswith('a'):
access = win32file.GENERIC_WRITE
if share is None:
share = win32con.FILE_SHARE_READ | win32con.FILE_SHARE_WRITE
create = win32file.OPEN_ALWAYS
if '+' in mode:
access |= win32file.GENERIC_READ
# TODO: if reading, offset should be 0?
sb = os.stat(path_handle)
self._overlap.Offset = sb.st_size
else:
self._overlap = None
raise ValueError('invalid mode "%s"' % mode)
flags = win32file.FILE_FLAG_OVERLAPPED
try:
self._handle = win32file.CreateFile(path_handle, access, share, None, create,
flags, None)
except Exception:
self._overlap = None
raise
if mode.startswith('r'):
flags = os.O_RDONLY
elif mode.startswith('a'):
flags = os.O_APPEND
else:
flags = 0
self._fileno = msvcrt.open_osfhandle(self._handle, flags)
else:
self._handle = path_handle
# pipe mode should be either 'r' or 'w'
flags = os.O_RDONLY if mode.startswith('r') else 0
self._fileno = msvcrt.open_osfhandle(self._handle, flags)
self._buflist = []
self._read_result = None
self._write_result = None
self._timeout = None
self._timeout_id = None
self._pycos = Pycos.scheduler()
if self._pycos:
self._notifier = self._pycos._notifier
self._notifier.register(self._handle)
else:
self._notifier = None
self._event = None
def read(self, size=0, full=False, timeout=None):
"""Read at most 'size' bytes from file; if 'size' <= 0,
all data up to EOF is read and returned. If 'full' is
True, exactly 'size' bytes are returned (unless EOF or
timeout occur before). If EOF is encountered before any
more data is available, empty buffer is returned.
If no data has been read before timeout, then
IOError('timedout') will be thrown.
If timeout is given and full is True and timeout expires
before all the data could be read, it returns partial data
read before timeout if any data has been read.
Must be used in a task with 'yield' as
'data = yield fd.read(1024)'
"""
def _read(size, full):
if size > 0:
count = size
else:
count = 16384
try:
buf = os.read(self._fileno, count)
except (OSError, IOError) as exc:
if exc.errno in (errno.EAGAIN, errno.EWOULDBLOCK):
return
else:
raise
except:
self._notifier.clear(self, _AsyncPoller._Read)
self._read_task.throw(*sys.exc_info())
self._read_task = self._read_fn = None
return
if buf:
if size > 0:
size -= len(buf)
# assert size >= 0
if size == 0:
full = False
self._buflist.append(buf)
if full:
self._read_fn = partial_func(_read, size, full)
return
if self._buflist:
buf, self._buflist = ''.join(self._buflist), []
self._notifier.clear(self, _AsyncPoller._Read)
self._read_task._proceed_(buf)
self._read_task = self._read_fn = None
if not self._pycos:
self._pycos = Pycos.scheduler()
self._notifier = self._pycos._notifier
if hasattr(self._fd, '_fileno'):
self._notifier.unregister(self._fd)
if not size or size < 0:
size = 0
full = True
elif self._buflist:
buf, self._buflist = ''.join(self._buflist), []
if len(buf) > size:
buf, self._buflist = buf[:size], [buf[size:]]
if (not full) or (len(buf) == size):
return buf
self._buflist = [buf]
size -= len(buf)
self._timeout = timeout
self._read_task = Pycos.cur_task(self._pycos)
self._read_task._await_()
self._read_fn = partial_func(_read, size, full)
self._notifier.add(self, _AsyncPoller._Read)
def write(self, buf, full=False, timeout=None):
"""Write data in 'buf' to file. If 'full' is True, the function
waits till all data in buf is written; otherwise, it waits
until one write completes. It returns length of data written.
If no data has been written before timeout, then
IOError('timedout') will be thrown.
If timeout is given and full is True and timeout expires
before all the data could be written, it returns length of
data written before timeout if any data has been written.
Must be used with 'yield' as
'n = yield fd.write(buf)' to write (some) data in buf.
"""
def _write(written, rc, n):
if rc or n == 0:
if self._timeout:
self._notifier._del_timeout(self)
if rc != winerror.ERROR_OPERATION_ABORTED:
if written:
self._write_task._proceed_(written)
else:
self._write_task.throw(IOError(rc, 'WriteFile', str(rc)))
self._overlap.object = self._write_task = self._write_result = None
return
written += n
self._overlap.Offset += n
self._write_result = self._write_result[n:]
if not full or len(self._write_result) == 0:
self._overlap.object = self._write_result = None
if self._timeout:
self._notifier._del_timeout(self)
self._write_task._proceed_(written)
self._write_task = None
return
self._overlap.object = partial_func(_write, written)
try:
rc, _ = win32file.WriteFile(self._handle, self._write_result, self._overlap)
except pywintypes.error as exc:
rc = exc.winerror
if rc and rc != winerror.ERROR_IO_PENDING:
self._overlap.object = self._write_result = None
if self._timeout:
self._notifier._del_timeout(self)
if written:
self._write_task._proceed_(written)
else:
self._write_task.throw(IOError(rc, 'WriteFile', str(rc)))
self._write_task = None
return
self._write_result = buffer(buf)
self._overlap.object = partial_func(_write, 0)
if not self._pycos:
self._pycos = Pycos.scheduler()
self._notifier = self._pycos._notifier
self._notifier.register(self._handle)
self._write_task = Pycos.cur_task(self._pycos)
self._write_task._await_()
try:
rc, _ = win32file.WriteFile(self._handle, self._write_result, self._overlap)
except pywintypes.error as exc:
if exc.winerror == winerror.ERROR_BROKEN_PIPE:
self._write_task._proceed_(0)
self._write_result = self._write_task = self._overlap.object = None
return
else:
rc = exc.winerror
if rc and rc != winerror.ERROR_IO_PENDING:
self._overlap.object = self._write_result = self._write_task = None
self._write_task._proceed_(None)
raise IOError(rc, 'WriteFile', str(rc))
if timeout:
self._timeout = timeout
self._notifier._add_timeout(self)
def read(self, size=0, full=False, timeout=None):
"""Read at most 'size' bytes from file; if 'size' <= 0,
all data up to EOF is read and returned. If 'full' is
True, exactly 'size' bytes are returned (unless EOF or
timeout occur before). If EOF is encountered before any
more data is available, empty buffer is returned.
If no data has been read before timeout, then
IOError('timedout') will be thrown.
If timeout is given and full is True and timeout expires
before all the data could be read, it returns partial data
read before timeout if any data has been read.
Must be used in a task with 'yield' as
'data = yield fd.read(1024)'
"""
def _read(size, full, rc, n):
if rc or n == 0:
if self._timeout:
self._notifier._del_timeout(self)
self._overlap.object = self._read_result = None
if rc != winerror.ERROR_OPERATION_ABORTED:
if (self._buflist or rc == winerror.ERROR_HANDLE_EOF or
rc == winerror.ERROR_BROKEN_PIPE):
buf, self._buflist = ''.join(self._buflist), []
self._read_task._proceed_(buf)
return
self._read_task.throw(IOError(rc, 'ReadFile', str(rc)))
self._overlap.object = self._read_task = self._read_result = None
return
buf = self._read_result[:n]
if size > 0:
size -= len(buf)
assert size >= 0
if size == 0:
full = False
self._buflist.append(buf)
self._overlap.Offset += n
if full:
self._overlap.object = partial_func(_read, size, full)
try:
rc, _ = win32file.ReadFile(self._handle, self._read_result, self._overlap)
except pywintypes.error as exc:
rc = exc.winerror
if rc and rc != winerror.ERROR_IO_PENDING:
buf, self._buflist = ''.join(self._buflist), []
self._overlap.object = self._read_result = None
if self._timeout:
self._notifier._del_timeout(self)
self._read_task._proceed_(buf)
self._read_task = None
return
if self._buflist:
buf, self._buflist = ''.join(self._buflist), []
if self._timeout:
self._notifier._del_timeout(self)
self._overlap.object = self._read_result = None
self._read_task._proceed_(buf)
self._read_task = None
if not self._pycos:
self._pycos = Pycos.scheduler()
self._notifier = self._pycos._notifier
self._notifier.register(self._handle)
if not size or size < 0:
count = 16384
full = True
else:
if self._buflist:
buf, self._buflist = ''.join(self._buflist), []
if len(buf) > size:
buf, self._buflist = buf[:size], [buf[size:]]
if (not full) or (len(buf) == size):
return buf
self._buflist = [buf]
size -= len(buf)
count = size
self._read_result = win32file.AllocateReadBuffer(count)
self._overlap.object = partial_func(_read, size, full)
self._read_task = Pycos.cur_task(self._pycos)
self._read_task._await_()
try:
rc, _ = win32file.ReadFile(self._handle, self._read_result, self._overlap)
except pywintypes.error as exc:
if exc.winerror == winerror.ERROR_BROKEN_PIPE:
buf, self._buflist = ''.join(self._buflist), []
self._read_task._proceed_(buf)
self._read_result = self._read_task = self._overlap.object = None
return
else:
rc = exc.winerror
if rc and rc != winerror.ERROR_IO_PENDING:
self._overlap.object = self._read_result = self._read_task = None
self._read_task.throw(IOError(rc, 'ReadFile', str(rc)))
if timeout:
self._timeout = timeout
self._notifier._add_timeout(self)
def __init__(self, path_handle, mode='r', share=None):
"""If 'path_handle' is a string, opens that file for
asynchronous I/O; if it is a handle (pipe client / server,
for example), sets up for asynchronous I/O. 'mode' is as
per 'open' Python function, although limited to
basic/common modes.
"""
self._overlap = pywintypes.OVERLAPPED()
if isinstance(path_handle, str):
self._path = path_handle
if mode.startswith('r'):
access = win32file.GENERIC_READ
if share is None:
share = win32con.FILE_SHARE_READ | win32con.FILE_SHARE_WRITE
create = win32file.OPEN_EXISTING
if '+' in mode:
access |= win32file.GENERIC_WRITE
elif mode.startswith('w'):
access = win32file.GENERIC_WRITE
if share is None:
share = win32con.FILE_SHARE_READ | win32con.FILE_SHARE_WRITE
create = win32file.CREATE_ALWAYS
if '+' in mode:
access |= win32file.GENERIC_READ
elif mode.startswith('a'):
access = win32file.GENERIC_WRITE
if share is None:
share = win32con.FILE_SHARE_READ | win32con.FILE_SHARE_WRITE
create = win32file.OPEN_ALWAYS
if '+' in mode:
access |= win32file.GENERIC_READ
# TODO: if reading, offset should be 0?
sb = os.stat(path_handle)
self._overlap.Offset = sb.st_size
else:
self._overlap = None
raise ValueError('invalid mode "%s"' % mode)
flags = win32file.FILE_FLAG_OVERLAPPED
try:
self._handle = win32file.CreateFile(path_handle, access, share, None, create,
flags, None)
except:
self._overlap = None
raise
if mode.startswith('r'):
flags = os.O_RDONLY
elif mode.startswith('a'):
flags = os.O_APPEND
else:
flags = 0
self._fileno = msvcrt.open_osfhandle(self._handle, flags)
else:
self._handle = path_handle
# pipe mode should be either 'r' or 'w'
flags = os.O_RDONLY if mode.startswith('r') else 0
self._fileno = msvcrt.open_osfhandle(self._handle, flags)
self._buflist = []
self._read_result = None
self._write_result = None
self._timeout = None
self._timeout_id = None
self._pycos = Pycos.scheduler()
if self._pycos:
self._notifier = self._pycos._notifier
self._notifier.register(self._handle)
else:
self._notifier = None