ceph/src/dmclock/src/dmclock_util.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 /*
   5  * Copyright (C) 2017 Red Hat Inc.
   6  */
   7
   8
   9 #pragma once
  10
  11
  12 #include <unistd.h>
  13 #include <assert.h>
  14 #include <sys/time.h>
  15
  16 #include <limits>
  17 #include <cmath>
  18 #include <chrono>
  19
  20
  21 namespace crimson {
  22   namespace dmclock {
  23     // we're using double to represent time, but we could change it by
  24     // changing the following declarations (and by making sure a min
  25     // function existed)
  26     using Time = double;
  27     static const Time TimeZero = 0.0;
  28     static const Time TimeMax = std::numeric_limits<Time>::max();
  29     static const double NaN = nan("");
  30
  31
  32     inline Time get_time() {
  33 #if defined(__linux__)
  34       struct timespec now;
  35       auto result = clock_gettime(CLOCK_REALTIME, &now);
  36       (void) result; // reference result in case assert is compiled out
  37       assert(0 == result);
  38       return now.tv_sec + (now.tv_nsec / 1.0e9);
  39 #else
  40       struct timeval now;
  41       auto result = gettimeofday(&now, NULL);
  42       (void) result; // reference result in case assert is compiled out
  43       assert(0 == result);
  44       return now.tv_sec + (now.tv_usec / 1.0e6);
  45 #endif
  46     }
  47
  48     std::string format_time(const Time& time, uint modulo = 1000);
  49
  50     void debugger();
  51
  52   } // namespace dmclock
  53 } // namespace crimson