1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ipc/chromium/src/base/message_pump_android.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,124 @@
1.4 +// Copyright (c) 2010 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#include "base/message_pump_android.h"
1.9 +
1.10 +#include <fcntl.h>
1.11 +#include <math.h>
1.12 +
1.13 +#include "base/eintr_wrapper.h"
1.14 +#include "base/lazy_instance.h"
1.15 +#include "base/logging.h"
1.16 +#include "base/platform_thread.h"
1.17 +
1.18 +namespace mozilla {
1.19 +bool ProcessNextEvent();
1.20 +void NotifyEvent();
1.21 +}
1.22 +
1.23 +namespace base {
1.24 +
1.25 +MessagePumpForUI::MessagePumpForUI()
1.26 + : state_(NULL)
1.27 + , pump(*this)
1.28 +{
1.29 +}
1.30 +
1.31 +MessagePumpForUI::~MessagePumpForUI() {
1.32 +}
1.33 +
1.34 +MessagePumpAndroid::MessagePumpAndroid(MessagePumpForUI &aPump)
1.35 + : pump(aPump)
1.36 +{
1.37 +}
1.38 +
1.39 +MessagePumpAndroid::~MessagePumpAndroid()
1.40 +{
1.41 +}
1.42 +
1.43 +void MessagePumpForUI::Run(Delegate* delegate) {
1.44 + RunState state;
1.45 + state.delegate = delegate;
1.46 + state.should_quit = false;
1.47 + state.run_depth = state_ ? state_->run_depth + 1 : 1;
1.48 + // We really only do a single task for each iteration of the loop. If we
1.49 + // have done something, assume there is likely something more to do. This
1.50 + // will mean that we don't block on the message pump until there was nothing
1.51 + // more to do. We also set this to true to make sure not to block on the
1.52 + // first iteration of the loop, so RunAllPending() works correctly.
1.53 + state.more_work_is_plausible = true;
1.54 +
1.55 + RunState* previous_state = state_;
1.56 + state_ = &state;
1.57 +
1.58 + // We run our own loop instead of using g_main_loop_quit in one of the
1.59 + // callbacks. This is so we only quit our own loops, and we don't quit
1.60 + // nested loops run by others. TODO(deanm): Is this what we want?
1.61 +
1.62 + while (!state_->should_quit) {
1.63 + mozilla::ProcessNextEvent();
1.64 + if (work_scheduled) {
1.65 + work_scheduled = false;
1.66 + HandleDispatch();
1.67 + }
1.68 + }
1.69 +
1.70 + state_ = previous_state;
1.71 +}
1.72 +
1.73 +void MessagePumpForUI::HandleDispatch() {
1.74 + // We should only ever have a single message on the wakeup pipe, since we
1.75 + // are only signaled when the queue went from empty to non-empty. The qApp
1.76 + // poll will tell us whether there was data, so this read shouldn't block.
1.77 + if (state_->should_quit)
1.78 + return;
1.79 +
1.80 + state_->more_work_is_plausible = false;
1.81 +
1.82 + if (state_->delegate->DoWork())
1.83 + state_->more_work_is_plausible = true;
1.84 +
1.85 + if (state_->should_quit)
1.86 + return;
1.87 +
1.88 + if (state_->delegate->DoDelayedWork(&delayed_work_time_))
1.89 + state_->more_work_is_plausible = true;
1.90 + if (state_->should_quit)
1.91 + return;
1.92 +
1.93 + // Don't do idle work if we think there are more important things
1.94 + // that we could be doing.
1.95 + if (state_->more_work_is_plausible)
1.96 + return;
1.97 +
1.98 + if (state_->delegate->DoIdleWork())
1.99 + state_->more_work_is_plausible = true;
1.100 + if (state_->should_quit)
1.101 + return;
1.102 +}
1.103 +
1.104 +void MessagePumpForUI::Quit() {
1.105 + if (state_) {
1.106 + state_->should_quit = true;
1.107 + } else {
1.108 + NOTREACHED() << "Quit called outside Run!";
1.109 + }
1.110 +}
1.111 +
1.112 +void MessagePumpForUI::ScheduleWork() {
1.113 + // This can be called on any thread, so we don't want to touch any state
1.114 + // variables as we would then need locks all over. This ensures that if
1.115 + // we are sleeping in a poll that we will wake up.
1.116 + work_scheduled = true;
1.117 + mozilla::NotifyEvent();
1.118 +}
1.119 +
1.120 +void MessagePumpForUI::ScheduleDelayedWork(const TimeTicks& delayed_work_time) {
1.121 + // We need to wake up the loop in case the poll timeout needs to be
1.122 + // adjusted. This will cause us to try to do work, but that's ok.
1.123 + delayed_work_time_ = delayed_work_time;
1.124 + ScheduleWork();
1.125 +}
1.126 +
1.127 +} // namespace base
