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# Copyright (c) 2009, 2010 Nicira, Inc.
#
# 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.
import sys
import time
try:
import ctypes
LIBRT = 'librt.so.1'
clock_gettime_name = 'clock_gettime'
if sys.platform.startswith("linux"):
CLOCK_MONOTONIC = 1
time_t = ctypes.c_long
elif sys.platform.startswith("netbsd"):
# NetBSD uses function renaming for ABI versioning. While the proper
# way to get the appropriate version is of course "#include <time.h>",
# it is difficult with ctypes. The following is appropriate for
# recent versions of NetBSD, including NetBSD-6.
LIBRT = 'libc.so.12'
clock_gettime_name = '__clock_gettime50'
CLOCK_MONOTONIC = 3
time_t = ctypes.c_int64
elif sys.platform.startswith("freebsd"):
CLOCK_MONOTONIC = 4
time_t = ctypes.c_int64
else:
raise Exception
class timespec(ctypes.Structure):
_fields_ = [
('tv_sec', time_t),
('tv_nsec', ctypes.c_long),
]
librt = ctypes.CDLL(LIBRT)
clock_gettime = getattr(librt, clock_gettime_name)
clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)]
except:
# Librt shared library could not be loaded
librt = None
def monotonic():
if not librt:
return time.time()
t = timespec()
if clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(t)) == 0:
return t.tv_sec + t.tv_nsec * 1e-9
# Kernel does not support CLOCK_MONOTONIC
return time.time()
# Use time.monotonic() if Python version >= 3.3
if not hasattr(time, 'monotonic'):
time.monotonic = monotonic
def msec():
""" Returns the system's monotonic time if possible, otherwise returns the
current time as the amount of time since the epoch, in milliseconds, as a
float."""
return time.monotonic() * 1000.0
def postfork():
# Just a stub for now
pass