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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354/* * 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;}