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c9d2977519
We used to strategically place newlines after some function call left parentheses to make pgindent move the argument list a few chars to the left, so that the whole line would fit under 80 chars. However, pgindent no longer does that, so the newlines just made the code vertically longer for no reason. Remove those newlines, and reflow some of those lines for some extra naturality. Reviewed-by: Michael Paquier, Tom Lane Discussion: https://postgr.es/m/20200129200401.GA6303@alvherre.pgsql
119 lines
4.1 KiB
C
119 lines
4.1 KiB
C
/*
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* gettimeofday.c
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* Win32 gettimeofday() replacement
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*
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* src/port/gettimeofday.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 <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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* Both GetSystemTimeAsFileTime and GetSystemTimePreciseAsFileTime share a
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* signature, so we can just store a pointer to whichever we find. This
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* is the pointer's type.
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*/
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typedef VOID(WINAPI * PgGetSystemTimeFn) (LPFILETIME);
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/* One-time initializer function, must match that signature. */
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static void WINAPI init_gettimeofday(LPFILETIME lpSystemTimeAsFileTime);
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/* Storage for the function we pick at runtime */
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static PgGetSystemTimeFn pg_get_system_time = &init_gettimeofday;
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/*
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* One time initializer. Determine whether GetSystemTimePreciseAsFileTime
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* is available and if so, plan to use it; if not, fall back to
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* GetSystemTimeAsFileTime.
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*/
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static void WINAPI
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init_gettimeofday(LPFILETIME lpSystemTimeAsFileTime)
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{
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/*
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* Because it's guaranteed that kernel32.dll will be linked into our
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* address space already, we don't need to LoadLibrary it and worry about
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* closing it afterwards, so we're not using Pg's dlopen/dlsym() wrapper.
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*
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* We'll just look up the address of GetSystemTimePreciseAsFileTime if
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* present.
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*
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* While we could look up the Windows version and skip this on Windows
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* versions below Windows 8 / Windows Server 2012 there isn't much point,
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* and determining the windows version is its self somewhat Windows
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* version and development SDK specific...
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*/
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pg_get_system_time = (PgGetSystemTimeFn) GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")),
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"GetSystemTimePreciseAsFileTime");
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if (pg_get_system_time == NULL)
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{
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/*
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* The expected error from GetLastError() is ERROR_PROC_NOT_FOUND, if
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* the function isn't present. No other error should occur.
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*
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* We can't report an error here because this might be running in
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* frontend code; and even if we're in the backend, it's too early to
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* elog(...) if we get some unexpected error. Also, it's not a
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* serious problem, so just silently fall back to
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* GetSystemTimeAsFileTime irrespective of why the failure occurred.
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*/
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pg_get_system_time = &GetSystemTimeAsFileTime;
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}
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(*pg_get_system_time) (lpSystemTimeAsFileTime);
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}
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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, struct timezone *tzp)
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{
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FILETIME file_time;
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ULARGE_INTEGER ularge;
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(*pg_get_system_time) (&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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