зеркало из https://github.com/mozilla/pjs.git
242 строки
6.8 KiB
C++
242 строки
6.8 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla IPC.
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*
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* The Initial Developer of the Original Code is
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* Ben Turner <bent.mozilla@gmail.com>.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "MessagePump.h"
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#include "nsComponentManagerUtils.h"
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#include "nsServiceManagerUtils.h"
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#include "nsStringGlue.h"
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#include "nsThreadUtils.h"
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#include "nsXULAppAPI.h"
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#include "pratom.h"
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#include "prthread.h"
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#include "base/logging.h"
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#include "base/scoped_nsautorelease_pool.h"
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#ifdef MOZ_WIDGET_ANDROID
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#include "AndroidBridge.h"
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#endif
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using mozilla::ipc::DoWorkRunnable;
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using mozilla::ipc::MessagePump;
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using mozilla::ipc::MessagePumpForChildProcess;
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using base::Time;
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NS_IMPL_THREADSAFE_ISUPPORTS2(DoWorkRunnable, nsIRunnable, nsITimerCallback)
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NS_IMETHODIMP
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DoWorkRunnable::Run()
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{
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MessageLoop* loop = MessageLoop::current();
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NS_ASSERTION(loop, "Shouldn't be null!");
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if (loop) {
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bool nestableTasksAllowed = loop->NestableTasksAllowed();
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// MessageLoop::RunTask() disallows nesting, but our Frankenventloop
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// will always dispatch DoWork() below from what looks to
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// MessageLoop like a nested context. So we unconditionally allow
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// nesting here.
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loop->SetNestableTasksAllowed(true);
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loop->DoWork();
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loop->SetNestableTasksAllowed(nestableTasksAllowed);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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DoWorkRunnable::Notify(nsITimer* aTimer)
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{
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MessageLoop* loop = MessageLoop::current();
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NS_ASSERTION(loop, "Shouldn't be null!");
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if (loop) {
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mPump->DoDelayedWork(loop);
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}
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return NS_OK;
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}
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MessagePump::MessagePump()
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: mThread(nsnull)
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{
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mDoWorkEvent = new DoWorkRunnable(this);
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}
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void
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MessagePump::Run(MessagePump::Delegate* aDelegate)
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{
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NS_ASSERTION(keep_running_, "Quit must have been called outside of Run!");
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NS_ASSERTION(NS_IsMainThread(), "Called Run on the wrong thread!");
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mThread = NS_GetCurrentThread();
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NS_ASSERTION(mThread, "This should never be null!");
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mDelayedWorkTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
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NS_ASSERTION(mDelayedWorkTimer, "Failed to create timer!");
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base::ScopedNSAutoreleasePool autoReleasePool;
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for (;;) {
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autoReleasePool.Recycle();
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bool did_work = NS_ProcessNextEvent(mThread, false) ? true : false;
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if (!keep_running_)
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break;
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did_work |= aDelegate->DoWork();
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if (!keep_running_)
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break;
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#ifdef MOZ_WIDGET_ANDROID
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// This processes messages in the Android Looper. Note that we only
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// get here if the normal Gecko event loop has been awoken above.
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// Bug 750713
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AndroidBridge::Bridge()->PumpMessageLoop();
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#endif
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did_work |= aDelegate->DoDelayedWork(&delayed_work_time_);
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if (did_work && delayed_work_time_.is_null())
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mDelayedWorkTimer->Cancel();
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if (!keep_running_)
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break;
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if (did_work)
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continue;
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did_work = aDelegate->DoIdleWork();
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if (!keep_running_)
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break;
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// This will either sleep or process an event.
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NS_ProcessNextEvent(mThread, true);
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}
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mDelayedWorkTimer->Cancel();
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keep_running_ = true;
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}
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void
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MessagePump::ScheduleWork()
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{
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// Make sure the event loop wakes up.
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if (mThread) {
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mThread->Dispatch(mDoWorkEvent, NS_DISPATCH_NORMAL);
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}
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else {
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// Some things (like xpcshell) don't use the app shell and so Run hasn't
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// been called. We still need to wake up the main thread.
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NS_DispatchToMainThread(mDoWorkEvent, NS_DISPATCH_NORMAL);
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}
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event_.Signal();
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}
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void
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MessagePump::ScheduleWorkForNestedLoop()
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{
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// This method is called when our MessageLoop has just allowed
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// nested tasks. In our setup, whenever that happens we know that
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// DoWork() will be called "soon", so there's no need to pay the
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// cost of what will be a no-op nsThread::Dispatch(mDoWorkEvent).
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}
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void
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MessagePump::ScheduleDelayedWork(const base::Time& aDelayedTime)
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{
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if (!mDelayedWorkTimer) {
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mDelayedWorkTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
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if (!mDelayedWorkTimer) {
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// Called before XPCOM has started up? We can't do this correctly.
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NS_WARNING("Delayed task might not run!");
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delayed_work_time_ = aDelayedTime;
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return;
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}
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}
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if (!delayed_work_time_.is_null()) {
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mDelayedWorkTimer->Cancel();
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}
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delayed_work_time_ = aDelayedTime;
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base::TimeDelta delay = aDelayedTime - base::Time::Now();
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PRUint32 delayMS = PRUint32(delay.InMilliseconds());
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mDelayedWorkTimer->InitWithCallback(mDoWorkEvent, delayMS,
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nsITimer::TYPE_ONE_SHOT);
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}
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void
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MessagePump::DoDelayedWork(base::MessagePump::Delegate* aDelegate)
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{
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aDelegate->DoDelayedWork(&delayed_work_time_);
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if (!delayed_work_time_.is_null()) {
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ScheduleDelayedWork(delayed_work_time_);
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}
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}
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#ifdef DEBUG
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namespace {
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MessagePump::Delegate* gFirstDelegate = nsnull;
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}
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#endif
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void
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MessagePumpForChildProcess::Run(MessagePump::Delegate* aDelegate)
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{
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if (mFirstRun) {
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#ifdef DEBUG
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NS_ASSERTION(aDelegate && gFirstDelegate == nsnull, "Huh?!");
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gFirstDelegate = aDelegate;
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#endif
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mFirstRun = false;
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if (NS_FAILED(XRE_RunAppShell())) {
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NS_WARNING("Failed to run app shell?!");
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}
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#ifdef DEBUG
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NS_ASSERTION(aDelegate && aDelegate == gFirstDelegate, "Huh?!");
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gFirstDelegate = nsnull;
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#endif
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return;
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}
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#ifdef DEBUG
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NS_ASSERTION(aDelegate && aDelegate == gFirstDelegate, "Huh?!");
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#endif
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// Really run.
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mozilla::ipc::MessagePump::Run(aDelegate);
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}
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