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Diffstat (limited to 'Source/JavaScriptCore/wtf/CurrentTime.cpp')
| -rw-r--r-- | Source/JavaScriptCore/wtf/CurrentTime.cpp | 349 |
1 files changed, 0 insertions, 349 deletions
diff --git a/Source/JavaScriptCore/wtf/CurrentTime.cpp b/Source/JavaScriptCore/wtf/CurrentTime.cpp deleted file mode 100644 index 1ebd084d8..000000000 --- a/Source/JavaScriptCore/wtf/CurrentTime.cpp +++ /dev/null @@ -1,349 +0,0 @@ -/* - * Copyright (C) 2006, 2010 Apple Inc. All rights reserved. - * Copyright (C) 2008 Google Inc. All rights reserved. - * Copyright (C) 2007-2009 Torch Mobile, Inc. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * Redistributions in binary form must reproduce the above - * copyright notice, this list of conditions and the following disclaimer - * in the documentation and/or other materials provided with the - * distribution. - * * Neither the name of Google Inc. nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include "config.h" -#include "CurrentTime.h" - -#if PLATFORM(MAC) -#include <mach/mach_time.h> -#include <sys/time.h> -#elif OS(WINDOWS) - -// Windows is first since we want to use hires timers, despite USE(CF) -// being defined. -// If defined, WIN32_LEAN_AND_MEAN disables timeBeginPeriod/timeEndPeriod. -#undef WIN32_LEAN_AND_MEAN -#include <windows.h> -#include <math.h> -#include <stdint.h> -#include <time.h> - -#if USE(QUERY_PERFORMANCE_COUNTER) -#if OS(WINCE) -extern "C" time_t mktime(struct tm *t); -#else -#include <sys/timeb.h> -#include <sys/types.h> -#endif -#endif - -#elif PLATFORM(WX) -#include <wx/datetime.h> -#elif PLATFORM(EFL) -#include <Ecore.h> -#else -#include <sys/time.h> -#endif - -#if PLATFORM(GTK) -#include <glib.h> -#endif - -#if PLATFORM(QT) -#include <QElapsedTimer> -#endif - -#if PLATFORM(CHROMIUM) -#error Chromium uses a different timer implementation -#endif - -namespace WTF { - -const double msPerSecond = 1000.0; - -#if OS(WINDOWS) - -#if USE(QUERY_PERFORMANCE_COUNTER) - -static LARGE_INTEGER qpcFrequency; -static bool syncedTime; - -static double highResUpTime() -{ - // We use QPC, but only after sanity checking its result, due to bugs: - // http://support.microsoft.com/kb/274323 - // http://support.microsoft.com/kb/895980 - // http://msdn.microsoft.com/en-us/library/ms644904.aspx ("...you can get different results on different processors due to bugs in the basic input/output system (BIOS) or the hardware abstraction layer (HAL)." - - static LARGE_INTEGER qpcLast; - static DWORD tickCountLast; - static bool inited; - - LARGE_INTEGER qpc; - QueryPerformanceCounter(&qpc); - DWORD tickCount = GetTickCount(); - - if (inited) { - __int64 qpcElapsed = ((qpc.QuadPart - qpcLast.QuadPart) * 1000) / qpcFrequency.QuadPart; - __int64 tickCountElapsed; - if (tickCount >= tickCountLast) - tickCountElapsed = (tickCount - tickCountLast); - else { -#if COMPILER(MINGW) - __int64 tickCountLarge = tickCount + 0x100000000ULL; -#else - __int64 tickCountLarge = tickCount + 0x100000000I64; -#endif - tickCountElapsed = tickCountLarge - tickCountLast; - } - - // force a re-sync if QueryPerformanceCounter differs from GetTickCount by more than 500ms. - // (500ms value is from http://support.microsoft.com/kb/274323) - __int64 diff = tickCountElapsed - qpcElapsed; - if (diff > 500 || diff < -500) - syncedTime = false; - } else - inited = true; - - qpcLast = qpc; - tickCountLast = tickCount; - - return (1000.0 * qpc.QuadPart) / static_cast<double>(qpcFrequency.QuadPart); -} - -static double lowResUTCTime() -{ -#if OS(WINCE) - SYSTEMTIME systemTime; - GetSystemTime(&systemTime); - struct tm tmtime; - tmtime.tm_year = systemTime.wYear - 1900; - tmtime.tm_mon = systemTime.wMonth - 1; - tmtime.tm_mday = systemTime.wDay; - tmtime.tm_wday = systemTime.wDayOfWeek; - tmtime.tm_hour = systemTime.wHour; - tmtime.tm_min = systemTime.wMinute; - tmtime.tm_sec = systemTime.wSecond; - time_t timet = mktime(&tmtime); - return timet * msPerSecond + systemTime.wMilliseconds; -#else - struct _timeb timebuffer; - _ftime(&timebuffer); - return timebuffer.time * msPerSecond + timebuffer.millitm; -#endif -} - -static bool qpcAvailable() -{ - static bool available; - static bool checked; - - if (checked) - return available; - - available = QueryPerformanceFrequency(&qpcFrequency); - checked = true; - return available; -} - -double currentTime() -{ - // Use a combination of ftime and QueryPerformanceCounter. - // ftime returns the information we want, but doesn't have sufficient resolution. - // QueryPerformanceCounter has high resolution, but is only usable to measure time intervals. - // To combine them, we call ftime and QueryPerformanceCounter initially. Later calls will use QueryPerformanceCounter - // by itself, adding the delta to the saved ftime. We periodically re-sync to correct for drift. - static double syncLowResUTCTime; - static double syncHighResUpTime; - static double lastUTCTime; - - double lowResTime = lowResUTCTime(); - - if (!qpcAvailable()) - return lowResTime / 1000.0; - - double highResTime = highResUpTime(); - - if (!syncedTime) { - timeBeginPeriod(1); // increase time resolution around low-res time getter - syncLowResUTCTime = lowResTime = lowResUTCTime(); - timeEndPeriod(1); // restore time resolution - syncHighResUpTime = highResTime; - syncedTime = true; - } - - double highResElapsed = highResTime - syncHighResUpTime; - double utc = syncLowResUTCTime + highResElapsed; - - // force a clock re-sync if we've drifted - double lowResElapsed = lowResTime - syncLowResUTCTime; - const double maximumAllowedDriftMsec = 15.625 * 2.0; // 2x the typical low-res accuracy - if (fabs(highResElapsed - lowResElapsed) > maximumAllowedDriftMsec) - syncedTime = false; - - // make sure time doesn't run backwards (only correct if difference is < 2 seconds, since DST or clock changes could occur) - const double backwardTimeLimit = 2000.0; - if (utc < lastUTCTime && (lastUTCTime - utc) < backwardTimeLimit) - return lastUTCTime / 1000.0; - lastUTCTime = utc; - return utc / 1000.0; -} - -#else - -static double currentSystemTime() -{ - FILETIME ft; - GetCurrentFT(&ft); - - // As per Windows documentation for FILETIME, copy the resulting FILETIME structure to a - // ULARGE_INTEGER structure using memcpy (using memcpy instead of direct assignment can - // prevent alignment faults on 64-bit Windows). - - ULARGE_INTEGER t; - memcpy(&t, &ft, sizeof(t)); - - // Windows file times are in 100s of nanoseconds. - // To convert to seconds, we have to divide by 10,000,000, which is more quickly - // done by multiplying by 0.0000001. - - // Between January 1, 1601 and January 1, 1970, there were 369 complete years, - // of which 89 were leap years (1700, 1800, and 1900 were not leap years). - // That is a total of 134774 days, which is 11644473600 seconds. - - return t.QuadPart * 0.0000001 - 11644473600.0; -} - -double currentTime() -{ - static bool init = false; - static double lastTime; - static DWORD lastTickCount; - if (!init) { - lastTime = currentSystemTime(); - lastTickCount = GetTickCount(); - init = true; - return lastTime; - } - - DWORD tickCountNow = GetTickCount(); - DWORD elapsed = tickCountNow - lastTickCount; - double timeNow = lastTime + (double)elapsed / 1000.; - if (elapsed >= 0x7FFFFFFF) { - lastTime = timeNow; - lastTickCount = tickCountNow; - } - return timeNow; -} - -#endif // USE(QUERY_PERFORMANCE_COUNTER) - -#elif PLATFORM(GTK) - -// Note: GTK on Windows will pick up the PLATFORM(WIN) implementation above which provides -// better accuracy compared with Windows implementation of g_get_current_time: -// (http://www.google.com/codesearch/p?hl=en#HHnNRjks1t0/glib-2.5.2/glib/gmain.c&q=g_get_current_time). -// Non-Windows GTK builds could use gettimeofday() directly but for the sake of consistency lets use GTK function. -double currentTime() -{ - GTimeVal now; - g_get_current_time(&now); - return static_cast<double>(now.tv_sec) + static_cast<double>(now.tv_usec / 1000000.0); -} - -#elif PLATFORM(WX) - -double currentTime() -{ - wxDateTime now = wxDateTime::UNow(); - return (double)now.GetTicks() + (double)(now.GetMillisecond() / 1000.0); -} - -#elif PLATFORM(EFL) - -double currentTime() -{ - return ecore_time_unix_get(); -} - -#else - -double currentTime() -{ - struct timeval now; - gettimeofday(&now, 0); - return now.tv_sec + now.tv_usec / 1000000.0; -} - -#endif - -#if PLATFORM(MAC) - -double monotonicallyIncreasingTime() -{ - // Based on listing #2 from Apple QA 1398. - static mach_timebase_info_data_t timebaseInfo; - if (!timebaseInfo.denom) { - kern_return_t kr = mach_timebase_info(&timebaseInfo); - ASSERT_UNUSED(kr, kr == KERN_SUCCESS); - } - return (mach_absolute_time() * timebaseInfo.numer) / (1.0e9 * timebaseInfo.denom); -} - -#elif PLATFORM(EFL) - -double monotonicallyIncreasingTime() -{ - return ecore_time_get(); -} - -#elif PLATFORM(GTK) - -double monotonicallyIncreasingTime() -{ - return static_cast<double>(g_get_monotonic_time() / 1000000.0); -} - -#elif PLATFORM(QT) - -double monotonicallyIncreasingTime() -{ - ASSERT(QElapsedTimer::isMonotonic()); - static QElapsedTimer timer; - return timer.nsecsElapsed() / 1.0e9; -} - -#else - -double monotonicallyIncreasingTime() -{ - static double lastTime = 0; - double currentTimeNow = currentTime(); - if (currentTimeNow < lastTime) - return lastTime; - lastTime = currentTimeNow; - return currentTimeNow; -} - -#endif - -} // namespace WTF |