76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/*
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* win32gettimeofday.c
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* Win32 gettimeofday() replacement
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*
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* src/port/win32gettimeofday.c
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*
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* Copyright (c) 2003 SRA, Inc.
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* Copyright (c) 2003 SKC, Inc.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose, without fee, and without a
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* written agreement is hereby granted, provided that the above
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* copyright notice and this paragraph and the following two
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* paragraphs appear in all copies.
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*
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT,
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* INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
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* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
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* DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS
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* IS" BASIS, AND THE AUTHOR HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE,
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* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#include "c.h"
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#include <sysinfoapi.h>
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#include <sys/time.h>
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/* FILETIME of Jan 1 1970 00:00:00, the PostgreSQL epoch */
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static const unsigned __int64 epoch = UINT64CONST(116444736000000000);
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/*
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* FILETIME represents the number of 100-nanosecond intervals since
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* January 1, 1601 (UTC).
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*/
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#define FILETIME_UNITS_PER_SEC 10000000L
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#define FILETIME_UNITS_PER_USEC 10
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/*
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* timezone information is stored outside the kernel so tzp isn't used anymore.
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*
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* Note: this function is not for Win32 high precision timing purposes. See
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* elapsed_time().
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*/
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int
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gettimeofday(struct timeval *tp, void *tzp)
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{
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FILETIME file_time;
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ULARGE_INTEGER ularge;
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/*
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* POSIX declines to define what tzp points to, saying "If tzp is not a
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* null pointer, the behavior is unspecified". Let's take this
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* opportunity to verify that noplace in Postgres tries to use any
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* unportable behavior.
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*/
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Assert(tzp == NULL);
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GetSystemTimePreciseAsFileTime(&file_time);
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ularge.LowPart = file_time.dwLowDateTime;
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ularge.HighPart = file_time.dwHighDateTime;
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tp->tv_sec = (long) ((ularge.QuadPart - epoch) / FILETIME_UNITS_PER_SEC);
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tp->tv_usec = (long) (((ularge.QuadPart - epoch) % FILETIME_UNITS_PER_SEC)
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/ FILETIME_UNITS_PER_USEC);
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return 0;
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}
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