Beispiel #1
0
NS_IMETHODIMP
DoWorkRunnable::Notify(nsITimer* aTimer)
{
  MessageLoop* loop = MessageLoop::current();
  MOZ_ASSERT(loop);

  bool nestableTasksAllowed = loop->NestableTasksAllowed();
  loop->SetNestableTasksAllowed(true);
  mPump->DoDelayedWork(loop);
  loop->SetNestableTasksAllowed(nestableTasksAllowed);

  return NS_OK;
}
Beispiel #2
0
nsresult
XRE_RunAppShell()
{
    nsCOMPtr<nsIAppShell> appShell(do_GetService(kAppShellCID));
    NS_ENSURE_TRUE(appShell, NS_ERROR_FAILURE);
#if defined(XP_MACOSX)
    {
      // In content processes that want XPCOM (and hence want
      // AppShell), we usually run our hybrid event loop through
      // MessagePump::Run(), by way of nsBaseAppShell::Run().  The
      // Cocoa nsAppShell impl, however, implements its own Run()
      // that's unaware of MessagePump.  That's all rather suboptimal,
      // but oddly enough not a problem... usually.
      // 
      // The problem with this setup comes during startup.
      // XPCOM-in-subprocesses depends on IPC, e.g. to init the pref
      // service, so we have to init IPC first.  But, IPC also
      // indirectly kinda-depends on XPCOM, because MessagePump
      // schedules work from off-main threads (e.g. IO thread) by
      // using NS_DispatchToMainThread().  If the IO thread receives a
      // Message from the parent before nsThreadManager is
      // initialized, then DispatchToMainThread() will fail, although
      // MessagePump will remember the task.  This race condition
      // isn't a problem when appShell->Run() ends up in
      // MessagePump::Run(), because MessagePump will immediate see it
      // has work to do.  It *is* a problem when we end up in [NSApp
      // run], because it's not aware that MessagePump has work that
      // needs to be processed; that was supposed to be signaled by
      // nsIRunnable(s).
      // 
      // So instead of hacking Cocoa nsAppShell or rewriting the
      // event-loop system, we compromise here by processing any tasks
      // that might have been enqueued on MessagePump, *before*
      // MessagePump::ScheduleWork was able to successfully
      // DispatchToMainThread().
      MessageLoop* loop = MessageLoop::current();
      bool couldNest = loop->NestableTasksAllowed();

      loop->SetNestableTasksAllowed(true);
      RefPtr<Runnable> task = new MessageLoop::QuitTask();
      loop->PostTask(task.forget());
      loop->Run();

      loop->SetNestableTasksAllowed(couldNest);
    }
#endif  // XP_MACOSX
    return appShell->Run();
}
Beispiel #3
0
NS_IMETHODIMP
DoWorkRunnable::Run()
{
  MessageLoop* loop = MessageLoop::current();
  MOZ_ASSERT(loop);

  bool nestableTasksAllowed = loop->NestableTasksAllowed();

  // MessageLoop::RunTask() disallows nesting, but our Frankenventloop will
  // always dispatch DoWork() below from what looks to MessageLoop like a nested
  // context.  So we unconditionally allow nesting here.
  loop->SetNestableTasksAllowed(true);
  loop->DoWork();
  loop->SetNestableTasksAllowed(nestableTasksAllowed);

  return NS_OK;
}
NS_IMETHODIMP
DoWorkRunnable::Run()
{
  MessageLoop* loop = MessageLoop::current();
  NS_ASSERTION(loop, "Shouldn't be null!");
  if (loop) {
    bool nestableTasksAllowed = loop->NestableTasksAllowed();

    // MessageLoop::RunTask() disallows nesting, but our Frankenventloop
    // will always dispatch DoWork() below from what looks to
    // MessageLoop like a nested context.  So we unconditionally allow
    // nesting here.
    loop->SetNestableTasksAllowed(true);
    loop->DoWork();
    loop->SetNestableTasksAllowed(nestableTasksAllowed);
  }
  return NS_OK;
}
void
MessagePumpForChildProcess::Run(MessagePump::Delegate* aDelegate)
{
  if (mFirstRun) {
#ifdef DEBUG
    NS_ASSERTION(aDelegate && gFirstDelegate == nullptr, "Huh?!");
    gFirstDelegate = aDelegate;
#endif
    mFirstRun = false;
    if (NS_FAILED(XRE_RunAppShell())) {
        NS_WARNING("Failed to run app shell?!");
    }
#ifdef DEBUG
    NS_ASSERTION(aDelegate && aDelegate == gFirstDelegate, "Huh?!");
    gFirstDelegate = nullptr;
#endif
    return;
  }

#ifdef DEBUG
  NS_ASSERTION(aDelegate && aDelegate == gFirstDelegate, "Huh?!");
#endif

  // We can get to this point in startup with Tasks in our loop's
  // incoming_queue_ or pending_queue_, but without a matching
  // DoWorkRunnable().  In MessagePump::Run() above, we sensitively
  // depend on *not* directly calling delegate->DoWork(), because that
  // prioritizes Tasks above XPCOM events.  However, from this point
  // forward, any Task posted to our loop is guaranteed to have a
  // DoWorkRunnable enqueued for it.
  //
  // So we just flush the pending work here and move on.
  MessageLoop* loop = MessageLoop::current();
  bool nestableTasksAllowed = loop->NestableTasksAllowed();
  loop->SetNestableTasksAllowed(true);

  while (aDelegate->DoWork());

  loop->SetNestableTasksAllowed(nestableTasksAllowed);


  // Really run.
  mozilla::ipc::MessagePump::Run(aDelegate);
}