104 lines
2.5 KiB
C++
104 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "WebGLContextLossHandler.h"
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#include "mozilla/DebugOnly.h"
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#include "nsISupportsImpl.h"
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#include "nsITimer.h"
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#include "nsThreadUtils.h"
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#include "WebGLContext.h"
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namespace mozilla {
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class WatchdogTimerEvent final : public nsITimerCallback
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{
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const WeakPtr<WebGLContextLossHandler> mHandler;
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public:
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NS_DECL_ISUPPORTS
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explicit WatchdogTimerEvent(WebGLContextLossHandler* handler)
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: mHandler(handler)
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{ }
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private:
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virtual ~WatchdogTimerEvent() { }
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NS_IMETHOD Notify(nsITimer*) override {
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if (mHandler) {
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mHandler->TimerCallback();
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}
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return NS_OK;
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}
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};
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NS_IMPL_ISUPPORTS(WatchdogTimerEvent, nsITimerCallback, nsISupports)
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////////////////////////////////////////
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WebGLContextLossHandler::WebGLContextLossHandler(WebGLContext* webgl)
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: mWebGL(webgl)
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, mTimer(do_CreateInstance(NS_TIMER_CONTRACTID))
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, mTimerPending(false)
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, mShouldRunTimerAgain(false)
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#ifdef DEBUG
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, mThread(NS_GetCurrentThread())
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#endif
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{
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MOZ_ASSERT(mThread);
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}
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WebGLContextLossHandler::~WebGLContextLossHandler()
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{
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// NS_GetCurrentThread() returns null during shutdown.
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const DebugOnly<nsIThread*> callingThread = NS_GetCurrentThread();
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MOZ_ASSERT(callingThread == mThread || !callingThread);
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}
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////////////////////
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void
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WebGLContextLossHandler::RunTimer()
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{
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MOZ_ASSERT(NS_GetCurrentThread() == mThread);
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// If the timer was already running, don't restart it here. Instead,
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// wait until the previous call is done, then fire it one more time.
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// This is also an optimization to prevent unnecessary
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// cross-communication between threads.
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if (mTimerPending) {
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mShouldRunTimerAgain = true;
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return;
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}
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const RefPtr<WatchdogTimerEvent> event = new WatchdogTimerEvent(this);
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const uint32_t kDelayMS = 1000;
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mTimer->InitWithCallback(event, kDelayMS, nsITimer::TYPE_ONE_SHOT);
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mTimerPending = true;
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}
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////////////////////
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void
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WebGLContextLossHandler::TimerCallback()
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{
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MOZ_ASSERT(NS_GetCurrentThread() == mThread);
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mTimerPending = false;
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const bool runOnceMore = mShouldRunTimerAgain;
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mShouldRunTimerAgain = false;
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mWebGL->UpdateContextLossStatus();
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if (runOnceMore && !mTimerPending) {
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RunTimer();
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}
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}
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} // namespace mozilla
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