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64 lines
2.2 KiB
Python
64 lines
2.2 KiB
Python
9 years ago
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#!/usr/bin/env python
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#
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# Copyright 2011 Facebook
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Interfaces for platform-specific functionality.
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This module exists primarily for documentation purposes and as base classes
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for other tornado.platform modules. Most code should import the appropriate
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implementation from `tornado.platform.auto`.
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"""
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from __future__ import absolute_import, division, print_function, with_statement
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def set_close_exec(fd):
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"""Sets the close-on-exec bit (``FD_CLOEXEC``)for a file descriptor."""
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raise NotImplementedError()
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class Waker(object):
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"""A socket-like object that can wake another thread from ``select()``.
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The `~tornado.ioloop.IOLoop` will add the Waker's `fileno()` to
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its ``select`` (or ``epoll`` or ``kqueue``) calls. When another
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thread wants to wake up the loop, it calls `wake`. Once it has woken
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up, it will call `consume` to do any necessary per-wake cleanup. When
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the ``IOLoop`` is closed, it closes its waker too.
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"""
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def fileno(self):
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"""Returns the read file descriptor for this waker.
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Must be suitable for use with ``select()`` or equivalent on the
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local platform.
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"""
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raise NotImplementedError()
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def write_fileno(self):
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"""Returns the write file descriptor for this waker."""
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raise NotImplementedError()
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def wake(self):
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"""Triggers activity on the waker's file descriptor."""
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raise NotImplementedError()
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def consume(self):
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"""Called after the listen has woken up to do any necessary cleanup."""
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raise NotImplementedError()
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def close(self):
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"""Closes the waker's file descriptor(s)."""
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raise NotImplementedError()
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