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*.egg-info
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*.pyc
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Apache License
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http://www.apache.org/licenses/
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@ -0,0 +1,43 @@
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|||
monotonic
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=========
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||||
This module provides a ``monotonic()`` function which returns the
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value (in fractional seconds) of a clock which never goes backwards.
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It is compatible with Python 2 and Python 3.
|
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On Python 3.3 or newer, ``monotonic`` will be an alias of
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[``time.monotonic``][0] from the standard library. On older versions,
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it will fall back to an equivalent implementation:
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OS | Implementation
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-------------|-------------------------
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Linux, *BSD | [clock_gettime][1]
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Windows | [GetTickCount64][2]
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OS X | [mach_absolute_time][3]
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|
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If no suitable implementation exists for the current platform,
|
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attempting to import this module (or to import from it) will
|
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cause a RuntimeError exception to be raised.
|
||||
|
||||
monotonic is available via the Python Cheese Shop (PyPI):
|
||||
https://pypi.python.org/pypi/monotonic/0.1
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License
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||||
-------
|
||||
Copyright 2014 Ori Livneh <ori@wikimedia.org>
|
||||
|
||||
Licensed under the Apache License, Version 2.0 (the "License");
|
||||
you may not use this file except in compliance with the License.
|
||||
You may obtain a copy of the License at
|
||||
|
||||
http://www.apache.org/licenses/LICENSE-2.0
|
||||
|
||||
Unless required by applicable law or agreed to in writing, software
|
||||
distributed under the License is distributed on an "AS IS" BASIS,
|
||||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
See the License for the specific language governing permissions and
|
||||
limitations under the License.
|
||||
|
||||
[0]: https://docs.python.org/3/library/time.html#time.monotonic
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||||
[1]: http://linux.die.net/man/3/clock_gettime
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||||
[2]: http://msdn.microsoft.com/en-us/library/windows/desktop/ms724411
|
||||
[3]: https://developer.apple.com/library/mac/qa/qa1398/
|
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@ -0,0 +1,120 @@
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# -*- coding: utf-8 -*-
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"""
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monotonic
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~~~~~~~~~
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This module provides a ``monotonic()`` function which returns the
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value (in fractional seconds) of a clock which never goes backwards.
|
||||
|
||||
On Python 3.3 or newer, ``monotonic`` will be an alias of
|
||||
``time.monotonic`` from the standard library. On older versions,
|
||||
it will fall back to an equivalent implementation:
|
||||
|
||||
+-------------+--------------------+
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| Linux, BSD | clock_gettime(3) |
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+-------------+--------------------+
|
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| Windows | GetTickCount64 |
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+-------------+--------------------+
|
||||
| OS X | mach_absolute_time |
|
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+-------------+--------------------+
|
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|
||||
If no suitable implementation exists for the current platform,
|
||||
attempting to import this module (or to import from it) will
|
||||
cause a RuntimeError exception to be raised.
|
||||
|
||||
|
||||
Copyright 2014 Ori Livneh <ori@wikimedia.org>
|
||||
|
||||
Licensed under the Apache License, Version 2.0 (the "License");
|
||||
you may not use this file except in compliance with the License.
|
||||
You may obtain a copy of the License at
|
||||
|
||||
http://www.apache.org/licenses/LICENSE-2.0
|
||||
|
||||
Unless required by applicable law or agreed to in writing, software
|
||||
distributed under the License is distributed on an "AS IS" BASIS,
|
||||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
See the License for the specific language governing permissions and
|
||||
limitations under the License.
|
||||
|
||||
"""
|
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from __future__ import absolute_import, division
|
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import ctypes
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import ctypes.util
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import os
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import sys
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||||
import time
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__all__ = ('monotonic',)
|
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|
||||
try:
|
||||
monotonic = time.monotonic
|
||||
except AttributeError:
|
||||
try:
|
||||
if sys.platform == 'darwin': # OS X, iOS
|
||||
# See Technical Q&A QA1398 of the Mac Developer Library:
|
||||
# <https://developer.apple.com/library/mac/qa/qa1398/>
|
||||
libc = ctypes.CDLL('libc.dylib', use_errno=True)
|
||||
|
||||
class mach_timebase_info_data_t(ctypes.Structure):
|
||||
"""System timebase info. Defined in <mach/mach_time.h>."""
|
||||
_fields_ = (('numer', ctypes.c_uint32),
|
||||
('denom', ctypes.c_uint32))
|
||||
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||||
mach_absolute_time = libc.mach_absolute_time
|
||||
mach_absolute_time.restype = ctypes.c_uint64
|
||||
|
||||
timebase = mach_timebase_info_data_t()
|
||||
libc.mach_timebase_info(ctypes.byref(timebase))
|
||||
ticks_per_second = timebase.numer / timebase.denom * 1.0e9
|
||||
|
||||
def monotonic():
|
||||
"""Monotonic clock, cannot go backward."""
|
||||
return mach_absolute_time() / ticks_per_second
|
||||
|
||||
elif sys.platform.startswith('win32'):
|
||||
# Windows Vista / Windows Server 2008 or newer.
|
||||
GetTickCount64 = ctypes.windll.kernel32.GetTickCount64
|
||||
GetTickCount64.restype = ctypes.c_ulonglong
|
||||
|
||||
def monotonic():
|
||||
"""Monotonic clock, cannot go backward."""
|
||||
return GetTickCount64() / 1000.0
|
||||
|
||||
else:
|
||||
try:
|
||||
clock_gettime = ctypes.CDLL(ctypes.util.find_library('c'),
|
||||
use_errno=True).clock_gettime
|
||||
except AttributeError:
|
||||
clock_gettime = ctypes.CDLL(ctypes.util.find_library('rt'),
|
||||
use_errno=True).clock_gettime
|
||||
|
||||
class timespec(ctypes.Structure):
|
||||
"""Time specification, as described in clock_gettime(3)."""
|
||||
_fields_ = (('tv_sec', ctypes.c_long),
|
||||
('tv_nsec', ctypes.c_long))
|
||||
|
||||
ts = timespec()
|
||||
|
||||
if sys.platform.startswith('linux'):
|
||||
CLOCK_MONOTONIC = 1
|
||||
elif sys.platform.startswith('freebsd'):
|
||||
CLOCK_MONOTONIC = 4
|
||||
elif 'bsd' in sys.platform:
|
||||
CLOCK_MONOTONIC = 3
|
||||
|
||||
def monotonic():
|
||||
"""Monotonic clock, cannot go backward."""
|
||||
if clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(ts)):
|
||||
errno = ctypes.get_errno()
|
||||
raise OSError(errno, os.strerror(errno))
|
||||
return ts.tv_sec + ts.tv_nsec / 1.0e9
|
||||
|
||||
# Perform a sanity-check.
|
||||
if monotonic() - monotonic() >= 0:
|
||||
raise ValueError('monotonic() is not monotonic!')
|
||||
|
||||
except Exception:
|
||||
raise RuntimeError('no suitable implementation for this system')
|
|
@ -0,0 +1,49 @@
|
|||
# -*- coding: utf-8 -*-
|
||||
"""
|
||||
monotonic
|
||||
~~~~~~~~~
|
||||
|
||||
This module provides a ``monotonic()`` function which returns the
|
||||
value (in fractional seconds) of a clock which never goes backwards.
|
||||
|
||||
On Python 3.3 or newer, ``monotonic`` will be an alias of
|
||||
``time.monotonic`` from the standard library. On older versions,
|
||||
it will fall back to an equivalent implementation:
|
||||
|
||||
+-------------+--------------------+
|
||||
| Linux, BSD | clock_gettime(3) |
|
||||
+-------------+--------------------+
|
||||
| Windows | GetTickCount64 |
|
||||
+-------------+--------------------+
|
||||
| OS X | mach_absolute_time |
|
||||
+-------------+--------------------+
|
||||
|
||||
If no suitable implementation exists for the current platform,
|
||||
attempting to import this module (or to import from it) will
|
||||
cause a RuntimeError exception to be raised.
|
||||
|
||||
"""
|
||||
try:
|
||||
from setuptools import setup
|
||||
except ImportError:
|
||||
from distutils.core import setup
|
||||
|
||||
|
||||
setup(
|
||||
name='monotonic',
|
||||
version='0.1',
|
||||
license='Apache',
|
||||
author='Ori Livneh',
|
||||
author_email='ori@wikimedia.org',
|
||||
url='https://github.com/atdt/monotonic',
|
||||
description='An implementation of time.monotonic() for Python 2 & < 3.3',
|
||||
long_description=__doc__,
|
||||
classifiers=(
|
||||
'Development Status :: 4 - Beta',
|
||||
'License :: OSI Approved :: Apache Software License',
|
||||
'Programming Language :: Python :: 2',
|
||||
'Programming Language :: Python :: 3',
|
||||
'Topic :: Software Development :: Libraries :: Python Modules',
|
||||
),
|
||||
py_modules=('monotonic',),
|
||||
)
|
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