42 lines
1.0 KiB
Python
Executable File
42 lines
1.0 KiB
Python
Executable File
#
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# Copyright (c) 2015-2016 Wind River Systems, Inc.
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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import ctypes
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import os
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from nfv_common import debug
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DLOG = debug.debug_get_logger('nfv_common.timers.timestamp')
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CLOCK_MONOTONIC_RAW = 4 # from <linux/time.h>
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class timespec(ctypes.Structure):
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"""
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Timespec C Type
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"""
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_fields_ = [('tv_sec', ctypes.c_long), ('tv_nsec', ctypes.c_long)]
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try:
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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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except Exception:
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raise OSError("Could not load librt.so library")
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def get_monotonic_timestamp_in_ms():
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"""
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Returns the timestamp in milliseconds
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"""
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t = timespec()
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if 0 != clock_gettime(CLOCK_MONOTONIC_RAW, ctypes.pointer(t)):
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errno_ = ctypes.get_errno()
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raise OSError(errno_, os.strerror(errno_))
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timestamp_ms = (t.tv_sec * 1e+3) + (t.tv_nsec * 1e-6)
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DLOG.verbose("Monotonic timestamp fetched is %s." % timestamp_ms)
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return timestamp_ms
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