55 строки
1.7 KiB
C
55 строки
1.7 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2014 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "opal_config.h"
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#include "opal/win32/opal_time.h"
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#include<time.h>
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#define EPOCHFILETIME (116444736000000000LL)
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int gettimeofday(struct timeval *tv, struct timezone *tz)
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{
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FILETIME file_time;
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LARGE_INTEGER place_holder;
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__int64 time;
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/* returns 64 bit value which is the number of 100 nanosecond
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intervals since 1601(UTC) */
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GetSystemTimeAsFileTime (&file_time);
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/* Windows recommends that we should copy the FILETIME returned
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into a ULARGE_INTEGER and then perform the arithmetic on that */
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place_holder.LowPart = file_time.dwLowDateTime;
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place_holder.HighPart = file_time.dwHighDateTime;
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time = place_holder.QuadPart;
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time -= EPOCHFILETIME;
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/* Now we can use arithmetic operations on time which is nothing but
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a 64 bit integer holding time in 100 nanosec intervals */
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/* convert 100 nanoseconds intervals into microseconds .. divide by 10 */
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time /= 10;
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tv->tv_sec = (long)(time / 1000000);
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tv->tv_usec = (long)(time % 1000000);
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return 0;
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}
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