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/*
* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "platform_uithread.h"
namespace rtc {
#if defined(WEBRTC_WIN)
// For use in ThreadWindowsUI callbacks
static UINT static_reg_windows_msg =
RegisterWindowMessageW(L"WebrtcWindowsUIThreadEvent");
// timer id used in delayed callbacks
static const UINT_PTR kTimerId = 1;
static const wchar_t kThisProperty[] = L"ThreadWindowsUIPtr";
static const wchar_t kThreadWindow[] = L"WebrtcWindowsUIThread";
bool PlatformUIThread::InternalInit() {
// Create an event window for use in generating callbacks to capture
// objects.
CritScope scoped_lock(&cs_);
if (hwnd_ == NULL) {
WNDCLASSW wc;
HMODULE hModule = GetModuleHandle(NULL);
if (!GetClassInfoW(hModule, kThreadWindow, &wc)) {
ZeroMemory(&wc, sizeof(WNDCLASSW));
wc.hInstance = hModule;
wc.lpfnWndProc = EventWindowProc;
wc.lpszClassName = kThreadWindow;
RegisterClassW(&wc);
}
hwnd_ = CreateWindowW(kThreadWindow, L"", 0, 0, 0, 0, 0, NULL, NULL,
hModule, NULL);
RTC_DCHECK(hwnd_);
SetPropW(hwnd_, kThisProperty, this);
if (timeout_) {
// if someone set the timer before we started
RequestCallbackTimer(timeout_);
}
}
return !!hwnd_;
}
void PlatformUIThread::RequestCallback() {
RTC_DCHECK(hwnd_);
RTC_DCHECK(static_reg_windows_msg);
PostMessage(hwnd_, static_reg_windows_msg, 0, 0);
}
bool PlatformUIThread::RequestCallbackTimer(unsigned int milliseconds) {
CritScope scoped_lock(&cs_);
if (!hwnd_) {
// There is a condition that thread_ (PlatformUIThread) has been
// created but PlatformUIThread::Run() hasn't been run yet (hwnd_ is
// null while thread_ is not). If we do RTC_DCHECK(!thread_) here,
// it would lead to crash in this condition.
// set timer once thread starts
} else {
if (timerid_) {
KillTimer(hwnd_, timerid_);
}
timerid_ = SetTimer(hwnd_, kTimerId, milliseconds, NULL);
}
timeout_ = milliseconds;
return !!timerid_;
}
void PlatformUIThread::Stop() {
RTC_DCHECK(thread_checker_.CalledOnValidThread());
// Shut down the dispatch loop and let the background thread exit.
if (timerid_) {
KillTimer(hwnd_, timerid_);
timerid_ = 0;
}
PostMessage(hwnd_, WM_CLOSE, 0, 0);
hwnd_ = NULL;
PlatformThread::Stop();
}
void PlatformUIThread::Run() {
RTC_CHECK(InternalInit()); // always evaluates
// The interface contract of Start/Stop is that for a successful call to
// Start, there should be at least one call to the run function. So we
// call the function before checking |stop_|.
run_function_deprecated_(obj_);
do {
// Alertable sleep to permit RaiseFlag to run and update |stop_|.
if (MsgWaitForMultipleObjectsEx(0, nullptr, INFINITE, QS_ALLINPUT,
MWMO_ALERTABLE | MWMO_INPUTAVAILABLE) ==
WAIT_OBJECT_0) {
MSG msg;
if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
if (msg.message == WM_QUIT) {
stop_ = true;
break;
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
} while (!stop_);
}
void PlatformUIThread::NativeEventCallback() {
if (!run_function_deprecated_) {
stop_ = true;
return;
}
run_function_deprecated_(obj_);
}
/* static */
LRESULT CALLBACK PlatformUIThread::EventWindowProc(HWND hwnd, UINT uMsg,
WPARAM wParam,
LPARAM lParam) {
if (uMsg == WM_DESTROY) {
RemovePropW(hwnd, kThisProperty);
PostQuitMessage(0);
return 0;
}
PlatformUIThread* twui =
static_cast<PlatformUIThread*>(GetPropW(hwnd, kThisProperty));
if (!twui) {
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
if ((uMsg == static_reg_windows_msg && uMsg != WM_NULL) ||
(uMsg == WM_TIMER && wParam == kTimerId)) {
twui->NativeEventCallback();
return 0;
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
#endif
} // namespace rtc
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