Merge pull request libgit2#5054 from tniessen/util-use-64-bit-timer

util: use 64 bit timer on Windows

Author: ethomson

CMakeLists.txt

@@ -263,6 +263,11 @@ ELSE ()
 	ENDIF ()
 ENDIF()
 
+# Ensure that MinGW provides the correct header files.
+IF (WIN32 AND NOT CYGWIN)
+	ADD_DEFINITIONS(-DWIN32 -D_WIN32_WINNT=0x0600)
+ENDIF()
+
 IF( NOT CMAKE_CONFIGURATION_TYPES )
 	# Build Debug by default
 	IF (NOT CMAKE_BUILD_TYPE)

src/CMakeLists.txt

@@ -299,8 +299,6 @@ FILE(GLOB SRC_H
 
 # On Windows use specific platform sources
 IF (WIN32 AND NOT CYGWIN)
-	ADD_DEFINITIONS(-DWIN32 -D_WIN32_WINNT=0x0600)
-
 	IF(MSVC)
 		SET(WIN_RC "win32/git2.rc")
 	ENDIF()

src/util.h

@@ -357,22 +357,9 @@ GIT_INLINE(void) git__memzero(void *data, size_t size)
 
 GIT_INLINE(double) git__timer(void)
 {
-	/* We need the initial tick count to detect if the tick
-	 * count has rolled over. */
-	static DWORD initial_tick_count = 0;
-
-	/* GetTickCount returns the number of milliseconds that have
+	/* GetTickCount64 returns the number of milliseconds that have
 	 * elapsed since the system was started. */
-	DWORD count = GetTickCount();
-
-	if(initial_tick_count == 0) {
-		initial_tick_count = count;
-	} else if (count < initial_tick_count) {
-		/* The tick count has rolled over - adjust for it. */
-		count = (0xFFFFFFFF - initial_tick_count) + count;
-	}
-
-	return (double) count / (double) 1000;
+	return (double) GetTickCount64() / (double) 1000;
 }
 
 #elif __APPLE__