tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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message_pump_default.cc (3044B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
      4 // Use of this source code is governed by a BSD-style license that can be
      5 // found in the LICENSE file.
      6 
      7 #include "base/message_pump_default.h"
      8 
      9 #include "base/logging.h"
     10 #include "base/message_loop.h"
     11 #include "base/scoped_nsautorelease_pool.h"
     12 
     13 #include "mozilla/BackgroundHangMonitor.h"
     14 #include "mozilla/ProfilerLabels.h"
     15 #include "mozilla/ProfilerThreadSleep.h"
     16 
     17 namespace base {
     18 
     19 MessagePumpDefault::MessagePumpDefault()
     20    : keep_running_(true), event_(false, false) {}
     21 
     22 void MessagePumpDefault::Run(Delegate* delegate) {
     23  AUTO_PROFILER_LABEL("MessagePumpDefault::Run", OTHER);
     24 
     25  DCHECK(keep_running_) << "Quit must have been called outside of Run!";
     26 
     27  const MessageLoop* const loop = MessageLoop::current();
     28  mozilla::BackgroundHangMonitor hangMonitor(loop->thread_name().c_str(),
     29                                             loop->transient_hang_timeout(),
     30                                             loop->permanent_hang_timeout());
     31 
     32  for (;;) {
     33    ScopedNSAutoreleasePool autorelease_pool;
     34 
     35    hangMonitor.NotifyActivity();
     36    bool did_work = delegate->DoWork();
     37    if (!keep_running_) break;
     38 
     39    hangMonitor.NotifyActivity();
     40    did_work |= delegate->DoDelayedWork(&delayed_work_time_);
     41    if (!keep_running_) break;
     42 
     43    if (did_work) continue;
     44 
     45    hangMonitor.NotifyActivity();
     46    did_work = delegate->DoIdleWork();
     47    if (!keep_running_) break;
     48 
     49    if (did_work) continue;
     50 
     51    if (delayed_work_time_.is_null()) {
     52      hangMonitor.NotifyWait();
     53      AUTO_PROFILER_LABEL("MessagePumpDefault::Run:Wait", IDLE);
     54      {
     55        AUTO_PROFILER_THREAD_SLEEP;
     56        event_.Wait();
     57      }
     58    } else {
     59      TimeDelta delay = delayed_work_time_ - TimeTicks::Now();
     60      if (delay > TimeDelta()) {
     61        hangMonitor.NotifyWait();
     62        AUTO_PROFILER_LABEL("MessagePumpDefault::Run:Wait", IDLE);
     63        {
     64          AUTO_PROFILER_THREAD_SLEEP;
     65          event_.TimedWait(delay);
     66        }
     67      } else {
     68        // It looks like delayed_work_time_ indicates a time in the past, so we
     69        // need to call DoDelayedWork now.
     70        delayed_work_time_ = TimeTicks();
     71      }
     72    }
     73    // Since event_ is auto-reset, we don't need to do anything special here
     74    // other than service each delegate method.
     75  }
     76 
     77  keep_running_ = true;
     78 }
     79 
     80 void MessagePumpDefault::Quit() { keep_running_ = false; }
     81 
     82 void MessagePumpDefault::ScheduleWork() {
     83  // Since this can be called on any thread, we need to ensure that our Run
     84  // loop wakes up.
     85  event_.Signal();
     86 }
     87 
     88 void MessagePumpDefault::ScheduleDelayedWork(
     89    const TimeTicks& delayed_work_time) {
     90  // We know that we can't be blocked on Wait right now since this method can
     91  // only be called on the same thread as Run, so we only need to update our
     92  // record of how long to sleep when we do sleep.
     93  delayed_work_time_ = delayed_work_time;
     94 }
     95 
     96 }  // namespace base