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/*
* Copyright (C) 2010 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. AND ITS 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 APPLE INC. OR ITS 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 "RunLoop.h"
#include "BinarySemaphore.h"
#include "WorkItem.h"
#include <wtf/CurrentTime.h>
using namespace CoreIPC;
using namespace std;
static const UINT PerformWorkMessage = WM_USER + 1;
static const LPWSTR kRunLoopMessageWindowClassName = L"RunLoopMessageWindow";
LRESULT CALLBACK RunLoop::RunLoopWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
LONG_PTR longPtr = ::GetWindowLongPtr(hWnd, 0);
if (RunLoop* runLoop = reinterpret_cast<RunLoop*>(longPtr))
return runLoop->wndProc(hWnd, message, wParam, lParam);
if (message == WM_CREATE) {
LPCREATESTRUCT createStruct = reinterpret_cast<LPCREATESTRUCT>(lParam);
// Associate the RunLoop with the window.
::SetWindowLongPtr(hWnd, 0, (LONG_PTR)createStruct->lpCreateParams);
return 0;
}
return ::DefWindowProc(hWnd, message, wParam, lParam);
}
LRESULT RunLoop::wndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) {
case PerformWorkMessage:
performWork();
return 0;
case WM_TIMER:
RunLoop::TimerBase::timerFired(this, wParam);
return 0;
}
return ::DefWindowProc(hWnd, message, wParam, lParam);
}
void RunLoop::run()
{
MSG message;
while (BOOL result = ::GetMessage(&message, 0, 0, 0)) {
if (result == -1)
break;
::TranslateMessage(&message);
::DispatchMessage(&message);
}
}
bool RunLoop::dispatchSentMessagesUntil(const Vector<HWND>& windows, CoreIPC::BinarySemaphore& semaphore, double absoluteTime)
{
if (windows.isEmpty())
return semaphore.wait(absoluteTime);
HANDLE handle = semaphore.event();
DWORD handleCount = 1;
while (true) {
DWORD interval = absoluteTimeToWaitTimeoutInterval(absoluteTime);
if (!interval) {
// Consider the wait to have timed out, even if the semaphore is currently signaled.
// This matches the WTF::ThreadCondition implementation of BinarySemaphore::wait.
return false;
}
DWORD result = ::MsgWaitForMultipleObjectsEx(handleCount, &handle, interval, QS_SENDMESSAGE, 0);
if (result == WAIT_OBJECT_0) {
// The semaphore was signaled.
return true;
}
if (result == WAIT_TIMEOUT) {
// absoluteTime was reached.
return false;
}
if (result == WAIT_OBJECT_0 + handleCount) {
// One or more sent messages are available. Process sent messages for all the windows
// we were given, since we don't have a way of knowing which window has available sent
// messages.
for (size_t i = 0; i < windows.size(); ++i) {
MSG message;
::PeekMessageW(&message, windows[i], 0, 0, PM_NOREMOVE | PM_QS_SENDMESSAGE);
}
continue;
}
ASSERT_WITH_MESSAGE(result != WAIT_FAILED, "::MsgWaitForMultipleObjectsEx failed with error %lu", ::GetLastError());
ASSERT_WITH_MESSAGE(false, "::MsgWaitForMultipleObjectsEx returned unexpected result %lu", result);
return false;
}
}
void RunLoop::stop()
{
::PostQuitMessage(0);
}
bool RunLoop::registerRunLoopMessageWindowClass()
{
// FIXME: This really only needs to be called once.
WNDCLASSEX windowClass = { 0 };
windowClass.cbSize = sizeof(windowClass);
windowClass.lpfnWndProc = RunLoop::RunLoopWndProc;
windowClass.cbWndExtra = sizeof(RunLoop*);
windowClass.lpszClassName = kRunLoopMessageWindowClassName;
return !!::RegisterClassEx(&windowClass);
}
RunLoop::RunLoop()
{
registerRunLoopMessageWindowClass();
m_runLoopMessageWindow = ::CreateWindow(kRunLoopMessageWindowClassName, 0, 0,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0,
HWND_MESSAGE, 0, 0, this);
ASSERT(::IsWindow(m_runLoopMessageWindow));
}
RunLoop::~RunLoop()
{
// FIXME: Tear down the work item queue here.
}
void RunLoop::wakeUp()
{
// FIXME: No need to wake up the run loop if we've already called scheduleWork
// before the run loop has had the time to respond.
::PostMessage(m_runLoopMessageWindow, PerformWorkMessage, reinterpret_cast<WPARAM>(this), 0);
}
// RunLoop::Timer
void RunLoop::TimerBase::timerFired(RunLoop* runLoop, uint64_t ID)
{
TimerMap::iterator it = runLoop->m_activeTimers.find(ID);
if (it == runLoop->m_activeTimers.end()) {
// The timer must have been stopped after the WM_TIMER message was posted to the message queue.
return;
}
TimerBase* timer = it->second;
if (!timer->m_isRepeating) {
runLoop->m_activeTimers.remove(it);
::KillTimer(runLoop->m_runLoopMessageWindow, ID);
}
timer->fired();
}
static uint64_t generateTimerID()
{
static uint64_t uniqueTimerID = 1;
return uniqueTimerID++;
}
RunLoop::TimerBase::TimerBase(RunLoop* runLoop)
: m_runLoop(runLoop)
, m_ID(generateTimerID())
, m_isRepeating(false)
{
}
RunLoop::TimerBase::~TimerBase()
{
stop();
}
void RunLoop::TimerBase::start(double nextFireInterval, bool repeat)
{
m_isRepeating = repeat;
m_runLoop->m_activeTimers.set(m_ID, this);
::SetTimer(m_runLoop->m_runLoopMessageWindow, m_ID, nextFireInterval * 1000, 0);
}
void RunLoop::TimerBase::stop()
{
TimerMap::iterator it = m_runLoop->m_activeTimers.find(m_ID);
if (it == m_runLoop->m_activeTimers.end())
return;
m_runLoop->m_activeTimers.remove(it);
::KillTimer(m_runLoop->m_runLoopMessageWindow, m_ID);
}
bool RunLoop::TimerBase::isActive() const
{
return m_runLoop->m_activeTimers.contains(m_ID);
}
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