197 lines
6.9 KiB
C++
197 lines
6.9 KiB
C++
/*
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* Copyright (C) 2006-2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "MainThreadSharedTimer.h"
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#include "DeprecatedGlobalSettings.h"
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#include "WebCoreInstanceHandle.h"
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#include "Widget.h"
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#include <wtf/Assertions.h>
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#include <wtf/WindowsExtras.h>
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#include <mmsystem.h>
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// These aren't in winuser.h with the MSVS 2003 Platform SDK,
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// so use default values in that case.
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#ifndef USER_TIMER_MINIMUM
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#define USER_TIMER_MINIMUM 0x0000000A
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#endif
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#ifndef USER_TIMER_MAXIMUM
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#define USER_TIMER_MAXIMUM 0x7FFFFFFF
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#endif
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#ifndef QS_RAWINPUT
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#define QS_RAWINPUT 0x0400
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#endif
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namespace WebCore {
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static UINT timerID;
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static HANDLE timer;
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static HWND timerWindowHandle = 0;
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const LPCWSTR kTimerWindowClassName = L"TimerWindowClass";
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static UINT timerFiredMessage = 0;
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static HANDLE timerQueue;
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static bool highResTimerActive;
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static bool processingCustomTimerMessage = false;
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static LONG pendingTimers;
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const int timerResolution = 1; // To improve timer resolution, we call timeBeginPeriod/timeEndPeriod with this value to increase timer resolution to 1ms.
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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).
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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).
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enum {
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sharedTimerID = 1000,
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endHighResTimerID = 1001,
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};
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LRESULT CALLBACK TimerWindowWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
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{
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if (message == WM_TIMER) {
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if (wParam == sharedTimerID) {
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KillTimer(timerWindowHandle, sharedTimerID);
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MainThreadSharedTimer::singleton().fired();
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} else if (wParam == endHighResTimerID) {
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KillTimer(timerWindowHandle, endHighResTimerID);
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highResTimerActive = false;
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timeEndPeriod(timerResolution);
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}
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} else if (message == timerFiredMessage) {
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InterlockedExchange(&pendingTimers, 0);
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processingCustomTimerMessage = true;
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MainThreadSharedTimer::singleton().fired();
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processingCustomTimerMessage = false;
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} else
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return DefWindowProc(hWnd, message, wParam, lParam);
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return 0;
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}
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static void initializeOffScreenTimerWindow()
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{
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if (timerWindowHandle)
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return;
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WNDCLASSEX wcex;
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memset(&wcex, 0, sizeof(WNDCLASSEX));
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wcex.cbSize = sizeof(WNDCLASSEX);
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wcex.lpfnWndProc = TimerWindowWndProc;
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wcex.hInstance = WebCore::instanceHandle();
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wcex.lpszClassName = kTimerWindowClassName;
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RegisterClassEx(&wcex);
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timerWindowHandle = CreateWindow(kTimerWindowClassName, 0, 0,
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CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, HWND_MESSAGE, 0, WebCore::instanceHandle(), 0);
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timerFiredMessage = RegisterWindowMessage(L"com.apple.WebKit.TimerFired");
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}
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static void NTAPI queueTimerProc(PVOID, BOOLEAN)
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{
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if (InterlockedIncrement(&pendingTimers) == 1)
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PostMessage(timerWindowHandle, timerFiredMessage, 0, 0);
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}
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void MainThreadSharedTimer::setFireInterval(Seconds intervalInSeconds)
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{
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ASSERT(m_firedFunction);
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double interval = intervalInSeconds.milliseconds();
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unsigned intervalInMS;
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if (interval > USER_TIMER_MAXIMUM)
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intervalInMS = USER_TIMER_MAXIMUM;
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else
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intervalInMS = static_cast<unsigned>(interval);
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initializeOffScreenTimerWindow();
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bool timerSet = false;
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if (DeprecatedGlobalSettings::shouldUseHighResolutionTimers()) {
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if (interval < highResolutionThresholdMsec) {
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if (!highResTimerActive) {
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highResTimerActive = true;
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timeBeginPeriod(timerResolution);
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}
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SetTimer(timerWindowHandle, endHighResTimerID, stopHighResTimerInMsec, 0);
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}
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DWORD queueStatus = LOWORD(GetQueueStatus(QS_PAINT | QS_MOUSEBUTTON | QS_KEY | QS_RAWINPUT));
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// Win32 has a tri-level queue with application messages > user input > WM_PAINT/WM_TIMER.
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// If the queue doesn't contains input events, we use a higher priorty timer event posting mechanism.
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if (!(queueStatus & (QS_MOUSEBUTTON | QS_KEY | QS_RAWINPUT))) {
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if (intervalInMS < USER_TIMER_MINIMUM && !processingCustomTimerMessage && !(queueStatus & QS_PAINT)) {
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// Call PostMessage immediately if the timer is already expired, unless a paint is pending.
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// (we prioritize paints over timers)
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if (InterlockedIncrement(&pendingTimers) == 1)
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PostMessage(timerWindowHandle, timerFiredMessage, 0, 0);
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timerSet = true;
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} else {
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// Otherwise, delay the PostMessage via a CreateTimerQueueTimer
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if (!timerQueue)
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timerQueue = CreateTimerQueue();
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if (timer)
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DeleteTimerQueueTimer(timerQueue, timer, 0);
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timerSet = CreateTimerQueueTimer(&timer, timerQueue, queueTimerProc, 0, intervalInMS, 0, WT_EXECUTEINTIMERTHREAD | WT_EXECUTEONLYONCE);
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}
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}
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}
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if (timerSet) {
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if (timerID) {
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KillTimer(timerWindowHandle, timerID);
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timerID = 0;
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}
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} else {
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timerID = SetTimer(timerWindowHandle, sharedTimerID, intervalInMS, 0);
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timer = 0;
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}
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}
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void MainThreadSharedTimer::stop()
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{
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if (timerQueue && timer) {
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DeleteTimerQueueTimer(timerQueue, timer, 0);
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timer = 0;
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}
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if (timerID) {
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KillTimer(timerWindowHandle, timerID);
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timerID = 0;
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}
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}
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void MainThreadSharedTimer::invalidate()
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{
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}
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}
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