79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
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#ifdef __APPLE__
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#include "clock_gettime.h"
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#include <mach/clock.h> // for clock_get_time
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#include <mach/clock_types.h> // for mach_timespec_t, CALENDAR_CLOCK, etc
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#include <mach/kern_return.h> // for KERN_SUCCESS, kern_return_t
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#include <mach/mach_host.h> // for host_get_clock_service
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#include <mach/mach_init.h> // for mach_host_self
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#include <mach/mach_types.h> // for clock_serv_t
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#include <sched.h> // for sched_yield
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#include <errno.h> // for EINVAL, errno
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#include <unistd.h> // for getpid
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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 ret;
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clock_serv_t clk;
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clock_id_t clk_serv_id;
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mach_timespec_t tm;
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uint64_t start, end, delta, nano;
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/*
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task_basic_info_data_t tinfo;
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task_thread_times_info_data_t ttinfo;
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mach_msg_type_number_t tflag;
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*/
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int retval = -1;
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switch (clk_id)
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{
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case CLOCK_REALTIME:
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case CLOCK_MONOTONIC:
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clk_serv_id = clk_id == CLOCK_REALTIME ? CALENDAR_CLOCK : SYSTEM_CLOCK;
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if (KERN_SUCCESS == (ret = host_get_clock_service(mach_host_self(), clk_serv_id, &clk)))
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{
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if (KERN_SUCCESS == (ret = clock_get_time(clk, &tm)))
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{
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tp->tv_sec = tm.tv_sec;
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tp->tv_nsec = tm.tv_nsec;
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retval = 0;
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}
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}
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if (KERN_SUCCESS != ret)
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{
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errno = EINVAL;
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retval = -1;
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}
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break;
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case CLOCK_PROCESS_CPUTIME_ID:
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case CLOCK_THREAD_CPUTIME_ID:
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start = mach_absolute_time();
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if (clk_id == CLOCK_PROCESS_CPUTIME_ID)
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{
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getpid();
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}
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else
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{
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sched_yield();
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}
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end = mach_absolute_time();
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delta = end - start;
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if (0 == __clock_gettime_inf.denom)
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{
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mach_timebase_info(&__clock_gettime_inf);
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}
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nano = delta * __clock_gettime_inf.numer / __clock_gettime_inf.denom;
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tp->tv_sec = nano * 1e-9;
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tp->tv_nsec = nano - (tp->tv_sec * 1e9);
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retval = 0;
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break;
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default:
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errno = EINVAL;
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retval = -1;
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}
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return retval;
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}
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#endif // __APPLE__
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