MainThreadSharedTimerWin.cpp [plain text]
#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>
#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; const int highResolutionThresholdMsec = 16; const int stopHighResTimerInMsec = 300;
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(Seconds intervalInSeconds)
{
ASSERT(m_firedFunction);
double interval = intervalInSeconds.milliseconds();
unsigned intervalInMS;
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));
if (!(queueStatus & (QS_MOUSEBUTTON | QS_KEY | QS_RAWINPUT))) {
if (intervalInMS < USER_TIMER_MINIMUM && !processingCustomTimerMessage && !(queueStatus & QS_PAINT)) {
if (InterlockedIncrement(&pendingTimers) == 1)
PostMessage(timerWindowHandle, timerFiredMessage, 0, 0);
timerSet = true;
} else {
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()
{
}
}