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43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
#include "mach_gettime.h"
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#include <mach/mach_time.h>
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#define MT_NANO (+1.0E-9)
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#define MT_GIGA UINT64_C(1000000000)
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// TODO create a list of timers,
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static double mt_timebase = 0.0;
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static uint64_t mt_timestart = 0;
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int clock_gettime(clockid_t clk_id, struct timespec *tp)
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{
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kern_return_t retval = KERN_SUCCESS;
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if (clk_id == TIMER_ABSTIME) {
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if (!mt_timestart) { // only one timer, initialized on the first call to the TIMER
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mach_timebase_info_data_t tb;
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mach_timebase_info(&tb);
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mt_timebase = tb.numer;
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mt_timebase /= tb.denom;
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mt_timestart = mach_absolute_time();
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}
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double diff = (mach_absolute_time() - mt_timestart) * mt_timebase;
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tp->tv_sec = diff * MT_NANO;
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tp->tv_nsec = diff - (tp->tv_sec * MT_GIGA);
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} else { // other clk_ids are mapped to the corresponding mach clock_service
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clock_serv_t cclock;
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mach_timespec_t mts;
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host_get_clock_service(mach_host_self(), clk_id, &cclock);
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retval = clock_get_time(cclock, &mts);
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mach_port_deallocate(mach_task_self(), cclock);
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tp->tv_sec = mts.tv_sec;
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tp->tv_nsec = mts.tv_nsec;
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}
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return retval;
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}
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/* Copyright (c) 2015-2018 Alf Watt - Open Source - https://opensource.org/licenses/MIT */
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