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Fix implementation of monotonic() on windows

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This commit is contained in:
Kovid Goyal 2015-06-17 11:31:39 +05:30
parent 2638d047df
commit eb6b2dcf2c
1 changed files with 15 additions and 9 deletions
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24
src/calibre/utils/monotonic.py
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@ -21,15 +21,22 @@ try:
except ImportError: except ImportError:
import ctypes import ctypes
import sys import sys
NSEC_PER_SEC = 1e9
try: try:
if sys.platform == 'win32': if sys.platform == 'win32':
# Windows only # Windows only
GetTickCount64 = ctypes.windll.kernel32.GetTickCount64 perf_frequency = ctypes.c_uint64()
GetTickCount64.restype = ctypes.c_ulonglong if ctypes.windll.kernel32.QueryPerformanceFrequency(ctypes.byref(perf_frequency)) == 0:
from time import time as monotonic # noqa
else:
perf_frequency = perf_frequency.value
def monotonic(): # NOQA def monotonic():
return GetTickCount64() / 1000 perf_counter = ctypes.c_uint64()
if ctypes.windll.kernel32.QueryPerformanceCounter(ctypes.byref(perf_counter)) == 0:
raise RuntimeError('monotonic() failed: %s' % ctypes.FormatError())
return perf_counter.value / perf_frequency
elif sys.platform == 'darwin': elif sys.platform == 'darwin':
# Mac OS X # Mac OS X
@ -62,7 +69,7 @@ except ImportError:
return (timebase.numer, timebase.denom) return (timebase.numer, timebase.denom)
timebase = mach_timebase_info() timebase = mach_timebase_info()
factor = timebase[0] / timebase[1] * 1e-9 factor = timebase[0] / timebase[1] * NSEC_PER_SEC
def monotonic(): # NOQA def monotonic(): # NOQA
return mach_absolute_time() * factor return mach_absolute_time() * factor
@ -93,12 +100,11 @@ except ImportError:
else: else:
raise OSError raise OSError
def monotonic(): # NOQA def monotonic():
if clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(tspec)) != 0: if clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(tspec)) != 0:
errno_ = ctypes.get_errno() errno_ = ctypes.get_errno()
raise OSError(errno_, os.strerror(errno_)) raise OSError(errno_, os.strerror(errno_))
return tspec.tv_sec + tspec.tv_nsec / 1e9 return tspec.tv_sec + tspec.tv_nsec / NSEC_PER_SEC
except: except:
from time import time as monotonic # NOQA from time import time as monotonic # noqa
monotonic