1 files changed, 146 insertions, 0 deletions
diff --git a/src/lib/platform/MSWindowsEventQueueBuffer.cpp b/src/lib/platform/MSWindowsEventQueueBuffer.cpp
new file mode 100644
index 0000000..f6de157
--- /dev/null
+++ b/src/lib/platform/MSWindowsEventQueueBuffer.cpp
@@ -0,0 +1,146 @@
+/*
+ * 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;
+}