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66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* get time since epoc in 100 nanosec units */
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/* thus to get the current time we should use the system function
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with the highest possible resolution */
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#ifdef __NETWARE__
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#include <nks/time.h>
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#endif
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#include "mysys_priv.h"
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ulonglong my_getsystime()
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{
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#ifdef HAVE_CLOCK_GETTIME
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struct timespec tp;
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clock_gettime(CLOCK_REALTIME, &tp);
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return (ulonglong)tp.tv_sec*10000000+(ulonglong)tp.tv_nsec/100;
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#elif defined(__WIN__)
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#define OFFSET_TO_EPOC ((__int64) 134774 * 24 * 60 * 60 * 1000 * 1000 * 10)
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static __int64 offset=0, freq;
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LARGE_INTEGER t_cnt;
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if (!offset)
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{
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/* strictly speaking there should be a mutex to protect
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initialization section. But my_getsystime() is called from
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UUID() code, and UUID() calls are serialized with a mutex anyway
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*/
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LARGE_INTEGER li;
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FILETIME ft;
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GetSystemTimeAsFileTime(&ft);
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li.LowPart=ft.dwLowDateTime;
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li.HighPart=ft.dwHighDateTime;
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offset=li.QuadPart-OFFSET_TO_EPOC;
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QueryPerformanceFrequency(&li);
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freq=li.QuadPart;
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QueryPerformanceCounter(&t_cnt);
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offset-=t_cnt.QuadPart/freq*10000000+t_cnt.QuadPart%freq*10000000/freq;
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}
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QueryPerformanceCounter(&t_cnt);
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return t_cnt.QuadPart/freq*10000000+t_cnt.QuadPart%freq*10000000/freq+offset;
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#elif defined(__NETWARE__)
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NXTime_t tm;
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NXGetTime(NX_SINCE_1970, NX_NSECONDS, &tm);
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return (ulonglong)tm/100;
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#else
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/* TODO: check for other possibilities for hi-res timestamping */
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struct timeval tv;
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gettimeofday(&tv,NULL);
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return (ulonglong)tv.tv_sec*10000000+(ulonglong)tv.tv_usec*10;
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#endif
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}
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