source/modules/water/misc/Time.cpp

   1 /*
   2   ==============================================================================
   3
   4    This file is part of the Water library.
   5    Copyright (c) 2016 ROLI Ltd.
   6    Copyright (C) 2017-2023 Filipe Coelho <falktx@falktx.com>
   7
   8    Permission is granted to use this software under the terms of the ISC license
   9    http://www.isc.org/downloads/software-support-policy/isc-license/
  10
  11    Permission to use, copy, modify, and/or distribute this software for any
  12    purpose with or without fee is hereby granted, provided that the above
  13    copyright notice and this permission notice appear in all copies.
  14
  15    THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
  16    TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17    FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
  18    OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
  19    USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  20    TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  21    OF THIS SOFTWARE.
  22
  23   ==============================================================================
  24 */
  25
  26 #include "Time.h"
  27 #include "../memory/Atomic.h"
  28
  29 #include <ctime>
  30
  31 #if defined(CARLA_OS_MAC)
  32 # include <mach/mach_time.h>
  33 #elif defined(CARLA_OS_WIN)
  34 # include <mmsystem.h>
  35 #endif
  36
  37 #ifdef _MSC_VER
  38 # include <sys/timeb.h>
  39 # include <sys/types.h>
  40 #else
  41 # include <sys/time.h>
  42 #endif
  43
  44 namespace water {
  45
  46 namespace TimeHelpers
  47 {
  48     static Atomic<uint32> lastMSCounterValue;
  49
  50    #ifdef CARLA_OS_MAC
  51     /*  NB: these are kept outside the HiResCounterInfo struct and initialised to 1 to avoid
  52         division-by-zero errors if some other static constructor calls us before this file's
  53         static constructors have had a chance to fill them in correctly..
  54     */
  55     static uint64 hiResCounterNumerator = 0, hiResCounterDenominator = 1;
  56
  57     struct HiResCounterInfo {
  58         HiResCounterInfo()
  59         {
  60             mach_timebase_info_data_t timebase;
  61             (void) mach_timebase_info (&timebase);
  62
  63             if (timebase.numer % 1000000 == 0)
  64             {
  65                 hiResCounterNumerator   = timebase.numer / 1000000;
  66                 hiResCounterDenominator = timebase.denom;
  67             }
  68             else
  69             {
  70                 hiResCounterNumerator   = timebase.numer;
  71                 hiResCounterDenominator = timebase.denom * (uint64) 1000000;
  72             }
  73         }
  74     };
  75
  76     static HiResCounterInfo hiResCounterInfo;
  77    #endif
  78 }
  79
  80 //==============================================================================
  81
  82 static uint32 water_millisecondsSinceStartup() noexcept
  83 {
  84 #if defined(CARLA_OS_MAC)
  85     return (uint32) ((mach_absolute_time() * TimeHelpers::hiResCounterNumerator) / TimeHelpers::hiResCounterDenominator);
  86 #elif defined(CARLA_OS_WIN)
  87     return (uint32) timeGetTime();
  88 #else
  89     timespec t;
  90    #ifdef CLOCK_MONOTONIC_RAW
  91     clock_gettime (CLOCK_MONOTONIC_RAW, &t);
  92    #else
  93     clock_gettime (CLOCK_MONOTONIC, &t);
  94    #endif
  95
  96     return (uint32) (t.tv_sec * 1000 + t.tv_nsec / 1000000);
  97 #endif
  98 }
  99
 100 //==============================================================================
 101
 102 int64 Time::currentTimeMillis() noexcept
 103 {
 104    #ifdef _MSC_VER
 105     struct _timeb tb;
 106     _ftime_s (&tb);
 107     return ((int64) tb.time) * 1000 + tb.millitm;
 108    #else
 109     struct timeval tv;
 110     gettimeofday (&tv, nullptr);
 111     return ((int64) tv.tv_sec) * 1000 + tv.tv_usec / 1000;
 112    #endif
 113 }
 114
 115 //==============================================================================
 116
 117 uint32 Time::getMillisecondCounter() noexcept
 118 {
 119     const uint32 now = water_millisecondsSinceStartup();
 120
 121     if (now < TimeHelpers::lastMSCounterValue.get())
 122     {
 123         // in multi-threaded apps this might be called concurrently, so
 124         // make sure that our last counter value only increases and doesn't
 125         // go backwards..
 126         if (now < TimeHelpers::lastMSCounterValue.get() - 1000U)
 127             TimeHelpers::lastMSCounterValue = now;
 128     }
 129     else
 130     {
 131         TimeHelpers::lastMSCounterValue = now;
 132     }
 133
 134     return now;
 135 }
 136
 137 }