39 lines
1.0 KiB
C
39 lines
1.0 KiB
C
/*
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* Apple // emulator for *ix
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*
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* This software package is subject to the GNU General Public License
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* version 3 or later (your choice) as published by the Free Software
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* Foundation.
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*
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* Copyright 2013-2015 Aaron Culliney
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*
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*/
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#include "common.h"
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#include <mach/mach_time.h>
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// Derived from http://stackoverflow.com/questions/5167269/clock-gettime-alternative-in-mac-os-x
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// 2014/06/21
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#define ORWL_NANO (+1.0E-9)
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#define ORWL_GIGA UINT64_C(1000000000)
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static double orwl_timebase = 0.0;
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static uint64_t orwl_timestart = 0;
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__attribute__((constructor(CTOR_PRIORITY_LATE)))
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static void __init_darwin_shim() {
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mach_timebase_info_data_t tb = { 0 };
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mach_timebase_info(&tb);
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orwl_timebase = tb.numer;
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orwl_timebase /= tb.denom;
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orwl_timestart = mach_absolute_time();
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}
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int clock_gettime(int clk_id, struct timespec *tp) {
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double diff = (mach_absolute_time() - orwl_timestart) * orwl_timebase;
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tp->tv_sec = diff * ORWL_NANO;
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tp->tv_nsec = diff - (tp->tv_sec * ORWL_GIGA);
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return 0;
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}
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