解决win32 X64下的gettimeofday非常缓慢的问题

docs/quick_start_win32_vs2015.md

@@ -9,18 +9,29 @@ Prerequisites:
 
 - Visual Studio 2015 Update 3 or
 - Visual Studio 2017
-- CMake 3.8.0 or higher (note: downloaded automatically if not found)
+- CMake 3.8.0  (note: downloaded automatically if not found, but version must be 3.8.x)
 - git.exe available in your path. You can download and install it from [https://git-for-windows.github.io/]
 - vcpkg. You can download and install it from [https://github.com/Microsoft/vcpkg]. Commits c5daa93506b616d253e257488ecc385271238e2a tests OK. Following [https://github.com/Microsoft/vcpkg#quick-start](https://github.com/Microsoft/vcpkg#quick-start) to install [vcpkg]. This document assumes that [vcpkg] is installed at `d:\git\vcpkg`.
 
 #### Install dependent libraries by using vcpkg
 
 Use [vcpkg] to install libevent,glog,gtest,gflags.
 
+## for win_x32:
+
 	D:\git\vcpkg>vcpkg install gflags
 	D:\git\vcpkg>vcpkg install glog
+	D:\git\vcpkg>vcpkg install openssl
 	D:\git\vcpkg>vcpkg install libevent-2.x
 
+## for win_x64:
+
+	D:\git\vcpkg>vcpkg install gflags:x64-windows
+	D:\git\vcpkg>vcpkg install glog:x64-windows
+	D:\git\vcpkg>vcpkg install openssl:x64-windows
+	D:\git\vcpkg>vcpkg install libevent-2.x:x64-windows
+
+
 #### Download the source code of evpp
 
 	$ git clone https://github.com/Qihoo360/evpp
@@ -36,9 +47,16 @@ Using the default vs solution file:
 
 Or, we can use CMake to compile the whole projects on WIDNOWS command line console (This does not work on unix shell):
 
+## for win_x32:
+	D:\360.git\evpp>md build
+	D:\360.git\evpp>cd build
+	D:\360.git\evpp\build>cmake -DCMAKE_TOOLCHAIN_FILE=your_vcpkg_path/scripts/buildsystems/vcpkg.cmake -G "Visual Studio 14 2015" ..
+	D:\360.git\evpp\build>start safe-evpp.sln
+
+## for win_x64:
 	D:\360.git\evpp>md build
 	D:\360.git\evpp>cd build
-	D:\360.git\evpp\build>cmake -DCMAKE_TOOLCHAIN_FILE=D:/git/vcpkg/scripts/buildsystems/vcpkg.cmake -G "Visual Studio 14 2015" ..
+	D:\360.git\evpp\build>cmake -DCMAKE_TOOLCHAIN_FILE=your_vcpkg_path/scripts/buildsystems/vcpkg.cmake -G "Visual Studio 14 2015 Win64" ..
 	D:\360.git\evpp\build>start safe-evpp.sln
 
 #### Run the unit tests
@@ -61,3 +79,7 @@ That will install [evpp] in your local machine. And then, you can use [evpp] in
 [https://git-for-windows.github.io/]:https://git-for-windows.github.io/
 
 
+
+
+
+

evpp/gettimeofday.h

@@ -16,20 +16,31 @@
 #ifndef H_GETTIMEOFDAY
 #define H_GETTIMEOFDAY
 inline int gettimeofday(struct timeval* tp, void* tzp) {
-    time_t clock;
-    struct tm tm;
-    SYSTEMTIME wtm;
-    GetLocalTime(&wtm);
-    tm.tm_year = wtm.wYear - 1900;
-    tm.tm_mon = wtm.wMonth - 1;
-    tm.tm_mday = wtm.wDay;
-    tm.tm_hour = wtm.wHour;
-    tm.tm_min = wtm.wMinute;
-    tm.tm_sec = wtm.wSecond;
-    tm.tm_isdst = -1;
-    clock = mktime(&tm);
-    tp->tv_sec = (long)clock;
-    tp->tv_usec = wtm.wMilliseconds * 1000;
+	uint64_t  intervals;
+	FILETIME  ft;
+
+	GetSystemTimeAsFileTime(&ft);
+
+	/*
+	* A file time is a 64-bit value that represents the number
+	* of 100-nanosecond intervals that have elapsed since
+	* January 1, 1601 12:00 A.M. UTC.
+	*
+	* Between January 1, 1970 (Epoch) and January 1, 1601 there were
+	* 134744 days,
+	* 11644473600 seconds or
+	* 11644473600,000,000,0 100-nanosecond intervals.
+	*
+	* See also MSKB Q167296.
+	*/
+
+	intervals = ((uint64_t)ft.dwHighDateTime << 32) | ft.dwLowDateTime;
+	intervals -= 116444736000000000;
+
+	tp->tv_sec = (long)(intervals / 10000000);
+	tp->tv_usec = (long)((intervals % 10000000) / 10);
+
+
     return (0);
 }
 #endif // end of H_GETTIMEOFDAY