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59dd7d94af
Linux and macOS already use nanosecond resolution for their sleep functions. It was just being converted from microseconds before. Since we have mp_time_ns now, go ahead and bump the precision here. The timer for windows uses some timeBeginPeriod thing which I'm not sure what it does really but whatever just convert the units to ms like they were doing before. There's really no reason to keep the mp_sleep_us helper around. A multiplication by 1000 is trivial and underlying OS clocks have nanosecond precision.
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/*
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* Precise timer routines using Mach timing
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*
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* Copyright (c) 2003-2004, Dan Villiom Podlaski Christiansen
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*/
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#include <unistd.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <time.h>
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#include <math.h>
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#include <sys/time.h>
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#include <mach/mach_time.h>
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#include "common/msg.h"
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#include "timer.h"
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static double timebase_ratio_ns;
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void mp_sleep_ns(int64_t ns)
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{
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uint64_t deadline = ns / timebase_ratio_ns + mach_absolute_time();
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mach_wait_until(deadline);
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}
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uint64_t mp_raw_time_ns(void)
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{
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return mach_absolute_time() * timebase_ratio_ns;
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}
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void mp_raw_time_init(void)
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{
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struct mach_timebase_info timebase;
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mach_timebase_info(&timebase);
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timebase_ratio_ns = (double)timebase.numer / (double)timebase.denom;
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}
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