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How to use clock_settime method in pytest-benchmark

Best Python code snippet using pytest-benchmark

clock.py

Source:clock.py

1#!/usr/bin/env python2# Python interface into the posix clock functions3# clock_gettime(), clock_settime()4#5# Motivation is to get access to CLOCK_MONOTONIC, so flight code can not care6# about jumps in system time (in which case CLOCK_REALTIME and python's7# datetime jump).8import ctypes9import os10CLOCK_REALTIME              = 011CLOCK_MONOTONIC             = 112CLOCK_PROCESS_CPUTIME_ID    = 213CLOCK_THREAD_CPUTIME_ID     = 314CLOCK_MONOTONIC_RAW         = 415CLOCK_REALTIME_COARSE       = 516CLOCK_MONOTONIC_COARSE      = 617CLOCK_BOOTTIME              = 718CLOCK_REALTIME_ALARM        = 819CLOCK_BOOTTIME_ALARM        = 920class timespec(ctypes.Structure):21    _fields_ = [22        ("tv_sec", ctypes.c_long),23        ("tv_nsec", ctypes.c_long)24    ]25librt = ctypes.CDLL('librt.so.1', use_errno=True)26clock_gettime = librt.clock_gettime27clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)]28clock_settime = librt.clock_settime29clock_settime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)]30def gettime(clock_id):31    t = timespec()32    if clock_gettime(clock_id, ctypes.pointer(t)) != 0:33        errno_ = ctypes.get_errno()34        raise OSError(errno_, os.strerror(errno_))35    return t36def gettime_us(clock_id):37    t = gettime(clock_id)38    return long(t.tv_sec * 1000000 + (t.tv_nsec + 500) / 1000)39def settime(clock_id, t):40    if clock_settime(clock_id, ctypes.pointer(t)) != 0:41        errno_ = ctypes.get_errno()42        raise OSError(errno_, os.strerror(errno_))43def settime_us(clock_id, us):44    t = timespec(us/1000000, (us%1000000) * 1000)45    if clock_settime(clock_id, ctypes.pointer(t)) != 0:46        errno_ = ctypes.get_errno()47        raise OSError(errno_, os.strerror(errno_))48def test(do_set):49    rt = gettime(CLOCK_REALTIME)50    print "REALTIME:  %10d.%09d" % (rt.tv_sec, rt.tv_nsec)51    mt = gettime(CLOCK_MONOTONIC)52    print "MONOTONIC: %10d.%09d" % (mt.tv_sec, mt.tv_nsec)53    if do_set:54        # WARNING: this sets the time to zero (1/1/1970)55        print "set time..."56        os.system("date --set=\"@0\"")57        rt = gettime(CLOCK_REALTIME)58        print "REALTIME:  %10d.%09d" % (rt.tv_sec, rt.tv_nsec)59        mt = gettime(CLOCK_MONOTONIC)...

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