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/*
* barrier -- mouse and keyboard sharing utility
* Copyright (C) 2012-2016 Symless Ltd.
* Copyright (C) 2004 Chris Schoeneman
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* found in the file LICENSE that should have accompanied this file.
*
* This package is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "platform/MSWindowsEventQueueBuffer.h"
#include "arch/win32/ArchMiscWindows.h"
#include "mt/Thread.h"
#include "base/IEventQueue.h"
//
// EventQueueTimer
//
class EventQueueTimer { };
//
// MSWindowsEventQueueBuffer
//
MSWindowsEventQueueBuffer::MSWindowsEventQueueBuffer(IEventQueue* events) :
m_events(events)
{
// remember thread. we'll be posting messages to it.
m_thread = GetCurrentThreadId();
// create a message type for custom events
m_userEvent = RegisterWindowMessage("BARRIER_USER_EVENT");
// get message type for daemon quit
m_daemonQuit = ArchMiscWindows::getDaemonQuitMessage();
// make sure this thread has a message queue
MSG dummy;
PeekMessage(&dummy, NULL, WM_USER, WM_USER, PM_NOREMOVE);
}
MSWindowsEventQueueBuffer::~MSWindowsEventQueueBuffer()
{
// do nothing
}
void
MSWindowsEventQueueBuffer::waitForEvent(double timeout)
{
// check if messages are available first. if we don't do this then
// MsgWaitForMultipleObjects() will block even if the queue isn't
// empty if the messages in the queue were there before the last
// call to GetMessage()/PeekMessage().
if (!isEmpty()) {
return;
}
// convert timeout
DWORD t;
if (timeout < 0.0) {
t = INFINITE;
}
else {
t = (DWORD)(1000.0 * timeout);
}
// wait for a message. we cannot be interrupted by thread
// cancellation but that's okay because we're run in the main
// thread and we never cancel that thread.
HANDLE dummy[1];
MsgWaitForMultipleObjects(0, dummy, FALSE, t, QS_ALLINPUT);
}
IEventQueueBuffer::Type
MSWindowsEventQueueBuffer::getEvent(Event& event, UInt32& dataID)
{
// peek at messages first. waiting for QS_ALLINPUT will return
// if a message has been sent to our window but GetMessage will
// dispatch that message behind our backs and block. PeekMessage
// will also dispatch behind our backs but won't block.
if (!PeekMessage(&m_event, NULL, 0, 0, PM_NOREMOVE) &&
!PeekMessage(&m_event, (HWND)-1, 0, 0, PM_NOREMOVE)) {
return kNone;
}
// BOOL. yeah, right.
BOOL result = GetMessage(&m_event, NULL, 0, 0);
if (result == -1) {
return kNone;
}
else if (result == 0) {
event = Event(Event::kQuit);
return kSystem;
}
else if (m_daemonQuit != 0 && m_event.message == m_daemonQuit) {
event = Event(Event::kQuit);
return kSystem;
}
else if (m_event.message == m_userEvent) {
dataID = static_cast<UInt32>(m_event.wParam);
return kUser;
}
else {
event = Event(Event::kSystem,
m_events->getSystemTarget(), &m_event);
return kSystem;
}
}
bool
MSWindowsEventQueueBuffer::addEvent(UInt32 dataID)
{
return (PostThreadMessage(m_thread, m_userEvent,
static_cast<WPARAM>(dataID), 0) != 0);
}
bool
MSWindowsEventQueueBuffer::isEmpty() const
{
// don't use QS_POINTER, QS_TOUCH, or any meta-flags that include them (like QS_ALLINPUT)
// because they can cause GetQueueStatus() to always return 0 and we miss events
return (HIWORD(GetQueueStatus(QS_POSTMESSAGE)) == 0);
}
EventQueueTimer*
MSWindowsEventQueueBuffer::newTimer(double, bool) const
{
return new EventQueueTimer;
}
void
MSWindowsEventQueueBuffer::deleteTimer(EventQueueTimer* timer) const
{
delete timer;
}
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