101 lines
2.7 KiB
Python
101 lines
2.7 KiB
Python
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# vim:fileencoding=utf-8:noet
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from __future__ import (unicode_literals, division, absolute_import, print_function)
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try:
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try:
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# >=python-3.3, Unix
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from time import clock_gettime
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try:
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# >={kernel}-sources-2.6.28
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from time import CLOCK_MONOTONIC_RAW as CLOCK_ID
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except ImportError:
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from time import CLOCK_MONOTONIC as CLOCK_ID
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monotonic = lambda: clock_gettime(CLOCK_ID)
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except ImportError:
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# >=python-3.3
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from time import monotonic
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except ImportError:
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import ctypes
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import sys
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try:
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if sys.platform == 'win32':
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# Windows only
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GetTickCount64 = ctypes.windll.kernel32.GetTickCount64
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GetTickCount64.restype = ctypes.c_ulonglong
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def monotonic():
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return GetTickCount64() / 1000
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elif sys.platform == 'darwin':
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# Mac OS X
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from ctypes.util import find_library
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libc_name = find_library('c')
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if not libc_name:
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raise OSError
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libc = ctypes.CDLL(libc_name, use_errno=True)
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mach_absolute_time = libc.mach_absolute_time
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mach_absolute_time.argtypes = ()
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mach_absolute_time.restype = ctypes.c_uint64
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class mach_timebase_info_data_t(ctypes.Structure):
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_fields_ = (
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('numer', ctypes.c_uint32),
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('denom', ctypes.c_uint32),
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)
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mach_timebase_info_data_p = ctypes.POINTER(mach_timebase_info_data_t)
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_mach_timebase_info = libc.mach_timebase_info
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_mach_timebase_info.argtypes = (mach_timebase_info_data_p,)
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_mach_timebase_info.restype = ctypes.c_int
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def mach_timebase_info():
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timebase = mach_timebase_info_data_t()
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_mach_timebase_info(ctypes.byref(timebase))
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return (timebase.numer, timebase.denom)
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timebase = mach_timebase_info()
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factor = timebase[0] / timebase[1] * 1e-9
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def monotonic():
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return mach_absolute_time() * factor
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else:
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# linux only (no librt on OS X)
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import os
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# See <bits/time.h>
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CLOCK_MONOTONIC = 1
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CLOCK_MONOTONIC_RAW = 4
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class timespec(ctypes.Structure):
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_fields_ = (
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('tv_sec', ctypes.c_long),
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('tv_nsec', ctypes.c_long)
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)
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tspec = timespec()
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librt = ctypes.CDLL('librt.so.1', use_errno=True)
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clock_gettime = librt.clock_gettime
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clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)]
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if clock_gettime(CLOCK_MONOTONIC_RAW, ctypes.pointer(tspec)) == 0:
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# >={kernel}-sources-2.6.28
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clock_id = CLOCK_MONOTONIC_RAW
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elif clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(tspec)) == 0:
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clock_id = CLOCK_MONOTONIC
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else:
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raise OSError
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def monotonic():
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if clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(tspec)) != 0:
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errno_ = ctypes.get_errno()
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raise OSError(errno_, os.strerror(errno_))
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return tspec.tv_sec + tspec.tv_nsec / 1e9
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except:
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from time import time as monotonic # NOQA
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