def fileno(self):
"""
Returns an OS-level file descriptor which can be used for polling, but
but not for reading or writing. This is primarily to allow Python's
``select`` module to work.
The first time ``fileno`` is called on a channel, a pipe is created to
simulate real OS-level file descriptor (FD) behavior. Because of this,
two OS-level FDs are created, which will use up FDs faster than normal.
(You won't notice this effect unless you have hundreds of channels
open at the same time.)
:return: an OS-level file descriptor (`int`)
.. warning::
This method causes channel reads to be slightly less efficient.
"""
self.lock.acquire()
try:
if self._pipe is not None:
return self._pipe.fileno()
# create the pipe and feed in any existing data
self._pipe = pipe.make_pipe()
p1, p2 = pipe.make_or_pipe(self._pipe)
self.in_buffer.set_event(p1)
self.in_stderr_buffer.set_event(p2)
return self._pipe.fileno()
finally:
self.lock.release()
def fileno(self):
"""
Returns an OS-level file descriptor which can be used for polling, but
but not for reading or writing. This is primarily to allow Python's
``select`` modules to work.
The first time ``fileno`` is called on a channel, a pipe is created to
simulate real OS-level file descriptor (FD) behavior. Because of this,
two OS-level FDs are created, which will use up FDs faster than normal.
(You won't notice this effect unless you have hundreds of channels
open at the same time.)
:return: an OS-level file descriptor (`int`)
.. warning::
This method causes channel reads to be slightly less efficient.
"""
self.lock.acquire()
try:
if self._pipe is not None:
return self._pipe.fileno()
# create the pipe and feed in any existing data
self._pipe = pipe.make_pipe()
p1, p2 = pipe.make_or_pipe(self._pipe)
self.in_buffer.set_event(p1)
self.in_stderr_buffer.set_event(p2)
return self._pipe.fileno()
finally:
self.lock.release()
def test_4_or_pipe(self):
p = pipe.make_pipe()
p1, p2 = pipe.make_or_pipe(p)
self.assertFalse(p._set)
p1.set()
self.assertTrue(p._set)
p2.set()
self.assertTrue(p._set)
p1.clear()
self.assertTrue(p._set)
p2.clear()
self.assertFalse(p._set)
def test_4_or_pipe(self):
p = pipe.make_pipe()
p1, p2 = pipe.make_or_pipe(p)
self.assertFalse(p._set)
p1.set()
self.assertTrue(p._set)
p2.set()
self.assertTrue(p._set)
p1.clear()
self.assertTrue(p._set)
p2.clear()
self.assertFalse(p._set)
