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/*
* Copyright (C) 2006 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "MainThreadSharedTimer.h"
#include "Page.h"
#include "Settings.h"
#include "WebCoreInstanceHandle.h"
#include "Widget.h"
#include <wtf/Assertions.h>
#include <wtf/CurrentTime.h>
#include <wtf/WindowsExtras.h>
#include <mmsystem.h>
// These aren't in winuser.h with the MSVS 2003 Platform SDK,
// so use default values in that case.
#ifndef USER_TIMER_MINIMUM
#define USER_TIMER_MINIMUM 0x0000000A
#endif
#ifndef USER_TIMER_MAXIMUM
#define USER_TIMER_MAXIMUM 0x7FFFFFFF
#endif
#ifndef QS_RAWINPUT
#define QS_RAWINPUT 0x0400
#endif
namespace WebCore {
static UINT timerID;
static HANDLE timer;
static HWND timerWindowHandle = 0;
const LPCWSTR kTimerWindowClassName = L"TimerWindowClass";
static UINT timerFiredMessage = 0;
static HANDLE timerQueue;
static bool highResTimerActive;
static bool processingCustomTimerMessage = false;
static LONG pendingTimers;
const int timerResolution = 1; // To improve timer resolution, we call timeBeginPeriod/timeEndPeriod with this value to increase timer resolution to 1ms.
const int highResolutionThresholdMsec = 16; // Only activate high-res timer for sub-16ms timers (Windows can fire timers at 16ms intervals without changing the system resolution).
const int stopHighResTimerInMsec = 300; // Stop high-res timer after 0.3 seconds to lessen power consumption (we don't use a smaller time since oscillating between high and low resolution breaks timer accuracy on XP).
enum {
sharedTimerID = 1000,
endHighResTimerID = 1001,
};
LRESULT CALLBACK TimerWindowWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
if (message == WM_TIMER) {
if (wParam == sharedTimerID) {
KillTimer(timerWindowHandle, sharedTimerID);
MainThreadSharedTimer::singleton().fired();
} else if (wParam == endHighResTimerID) {
KillTimer(timerWindowHandle, endHighResTimerID);
highResTimerActive = false;
timeEndPeriod(timerResolution);
}
} else if (message == timerFiredMessage) {
InterlockedExchange(&pendingTimers, 0);
processingCustomTimerMessage = true;
MainThreadSharedTimer::singleton().fired();
processingCustomTimerMessage = false;
} else
return DefWindowProc(hWnd, message, wParam, lParam);
return 0;
}
static void initializeOffScreenTimerWindow()
{
if (timerWindowHandle)
return;
WNDCLASSEX wcex;
memset(&wcex, 0, sizeof(WNDCLASSEX));
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.lpfnWndProc = TimerWindowWndProc;
wcex.hInstance = WebCore::instanceHandle();
wcex.lpszClassName = kTimerWindowClassName;
RegisterClassEx(&wcex);
timerWindowHandle = CreateWindow(kTimerWindowClassName, 0, 0,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, HWND_MESSAGE, 0, WebCore::instanceHandle(), 0);
timerFiredMessage = RegisterWindowMessage(L"com.apple.WebKit.TimerFired");
}
static void NTAPI queueTimerProc(PVOID, BOOLEAN)
{
if (InterlockedIncrement(&pendingTimers) == 1)
PostMessage(timerWindowHandle, timerFiredMessage, 0, 0);
}
void MainThreadSharedTimer::setFireInterval(double interval)
{
ASSERT(m_firedFunction);
unsigned intervalInMS;
interval *= 1000;
if (interval > USER_TIMER_MAXIMUM)
intervalInMS = USER_TIMER_MAXIMUM;
else
intervalInMS = static_cast<unsigned>(interval);
initializeOffScreenTimerWindow();
bool timerSet = false;
if (Settings::shouldUseHighResolutionTimers()) {
if (interval < highResolutionThresholdMsec) {
if (!highResTimerActive) {
highResTimerActive = true;
timeBeginPeriod(timerResolution);
}
SetTimer(timerWindowHandle, endHighResTimerID, stopHighResTimerInMsec, 0);
}
DWORD queueStatus = LOWORD(GetQueueStatus(QS_PAINT | QS_MOUSEBUTTON | QS_KEY | QS_RAWINPUT));
// Win32 has a tri-level queue with application messages > user input > WM_PAINT/WM_TIMER.
// If the queue doesn't contains input events, we use a higher priorty timer event posting mechanism.
if (!(queueStatus & (QS_MOUSEBUTTON | QS_KEY | QS_RAWINPUT))) {
if (intervalInMS < USER_TIMER_MINIMUM && !processingCustomTimerMessage && !(queueStatus & QS_PAINT)) {
// Call PostMessage immediately if the timer is already expired, unless a paint is pending.
// (we prioritize paints over timers)
if (InterlockedIncrement(&pendingTimers) == 1)
PostMessage(timerWindowHandle, timerFiredMessage, 0, 0);
timerSet = true;
} else {
// Otherwise, delay the PostMessage via a CreateTimerQueueTimer
if (!timerQueue)
timerQueue = CreateTimerQueue();
if (timer)
DeleteTimerQueueTimer(timerQueue, timer, 0);
timerSet = CreateTimerQueueTimer(&timer, timerQueue, queueTimerProc, 0, intervalInMS, 0, WT_EXECUTEINTIMERTHREAD | WT_EXECUTEONLYONCE);
}
}
}
if (timerSet) {
if (timerID) {
KillTimer(timerWindowHandle, timerID);
timerID = 0;
}
} else {
timerID = SetTimer(timerWindowHandle, sharedTimerID, intervalInMS, 0);
timer = 0;
}
}
void MainThreadSharedTimer::stop()
{
if (timerQueue && timer) {
DeleteTimerQueueTimer(timerQueue, timer, 0);
timer = 0;
}
if (timerID) {
KillTimer(timerWindowHandle, timerID);
timerID = 0;
}
}
void MainThreadSharedTimer::invalidate()
{
}
}
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