Paul Davis
412b6a922d
Move timebase initialization into microsecond_timer_init() and drop conditional
108 lines
2.8 KiB
C++
108 lines
2.8 KiB
C++
/*
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* Copyright (C) 2021 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2013-2015 Tim Mayberry <mojofunk@gmail.com>
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* Copyright (C) 2014-2015 John Emmas <john@creativepost.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <time.h>
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#ifdef PLATFORM_WINDOWS
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#include <profileapi.h>
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#include <windows.h> // for LARGE_INTEGER
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#endif
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#ifdef __MACH__
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#include <mach/mach_time.h>
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#define CLOCK_REALTIME 0
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#define CLOCK_MONOTONIC 0
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#endif
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#include "pbd/error.h"
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#include "pbd/microseconds.h"
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#include "pbd/i18n.h"
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#ifdef PLATFORM_WINDOWS
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static double timer_rate_usecs = 0.0;
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#endif
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#ifdef __MACH__
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static mach_timebase_info_data_t timebase;
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#endif
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/** Return a monotonic value for the number of microseconds that have elapsed
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* since an arbitrary zero origin.
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*/
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#ifdef __MACH__
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#include <mach/mach_time.h>
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#ifndef CLOCK_REALTIME
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/* Thanks Apple for not implementing this basic SUSv2, POSIX.1-2001 function
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*/
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#define CLOCK_REALTIME 0
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#define CLOCK_MONOTONIC 0
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int
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clock_gettime (int /*clk_id*/, struct timespec* t)
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{
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uint64_t time;
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time = mach_absolute_time ();
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double nseconds = ((double)time * (double)timebase.numer) / ((double)timebase.denom);
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double seconds = ((double)time * (double)timebase.numer) / ((double)timebase.denom * 1e9);
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t->tv_sec = seconds;
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t->tv_nsec = nseconds;
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return 0;
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}
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#endif
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#endif
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void
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PBD::microsecond_timer_init ()
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{
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#ifdef PLATFORM_WINDOWS
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LARGE_INTEGER freq;
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if (!QueryPerformanceFrequency(&freq) || freq.QuadPart < 1) {
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info << X_("Failed to determine frequency of QPC\n") << endmsg;
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timer_rate_usecs = 0;
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} else {
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timer_rate_usecs = 1000000.0 / freq.QuadPart;
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}
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#endif
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#ifdef __MACH__
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mach_timebase_info (&timebase);
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#endif
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}
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PBD::microseconds_t
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PBD::get_microseconds ()
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{
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#ifdef PLATFORM_WINDOWS
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LARGE_INTEGER time;
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if (timer_rate_usecs) {
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if (QueryPerformanceCounter (&time)) {
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return (microseconds_t) (time.QuadPart * timer_rate_usecs);
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}
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}
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return (microseconds_t) 0;
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#else
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struct timespec ts;
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if (clock_gettime (CLOCK_MONOTONIC, &ts) != 0) {
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/* EEEK! */
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return 0;
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}
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return (microseconds_t)ts.tv_sec * 1000000 + (ts.tv_nsec / 1000);
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#endif
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}
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