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/*
* Precise timer routines using Mach timing
*
* Copyright (c) 2003-2004, Dan Villiom Podlaski Christiansen
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*/
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <sys/time.h>
#include <mach/mach_time.h>
#include "common/msg.h"
#include "timer.h"
static double timebase_ratio_ns;
void mp_sleep_ns(int64_t ns)
{
uint64_t deadline = ns / timebase_ratio_ns + mach_absolute_time();
mach_wait_until(deadline);
}
uint64_t mp_raw_time_ns(void)
{
return mp_raw_time_ns_from_mach(mach_absolute_time());
}
uint64_t mp_raw_time_ns_from_mach(uint64_t mach_time)
{
return mach_time * timebase_ratio_ns;
}
void mp_raw_time_init(void)
{
struct mach_timebase_info timebase;
mach_timebase_info(&timebase);
timebase_ratio_ns = (double)timebase.numer / (double)timebase.denom;
}
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