ipc/chromium/src/base/message_pump_android.cc@6474c204b198 (annotated)
ipc/chromium/src/base/message_pump_android.cc
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | // Copyright (c) 2010 The Chromium Authors. All rights reserved. |
| michael@0 | 2 | // Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 3 | // found in the LICENSE file. |
| michael@0 | 4 | |
| michael@0 | 5 | #include "base/message_pump_android.h" |
| michael@0 | 6 | |
| michael@0 | 7 | #include <fcntl.h> |
| michael@0 | 8 | #include <math.h> |
| michael@0 | 9 | |
| michael@0 | 10 | #include "base/eintr_wrapper.h" |
| michael@0 | 11 | #include "base/lazy_instance.h" |
| michael@0 | 12 | #include "base/logging.h" |
| michael@0 | 13 | #include "base/platform_thread.h" |
| michael@0 | 14 | |
| michael@0 | 15 | namespace mozilla { |
| michael@0 | 16 | bool ProcessNextEvent(); |
| michael@0 | 17 | void NotifyEvent(); |
| michael@0 | 18 | } |
| michael@0 | 19 | |
| michael@0 | 20 | namespace base { |
| michael@0 | 21 | |
| michael@0 | 22 | MessagePumpForUI::MessagePumpForUI() |
| michael@0 | 23 | : state_(NULL) |
| michael@0 | 24 | , pump(*this) |
| michael@0 | 25 | { |
| michael@0 | 26 | } |
| michael@0 | 27 | |
| michael@0 | 28 | MessagePumpForUI::~MessagePumpForUI() { |
| michael@0 | 29 | } |
| michael@0 | 30 | |
| michael@0 | 31 | MessagePumpAndroid::MessagePumpAndroid(MessagePumpForUI &aPump) |
| michael@0 | 32 | : pump(aPump) |
| michael@0 | 33 | { |
| michael@0 | 34 | } |
| michael@0 | 35 | |
| michael@0 | 36 | MessagePumpAndroid::~MessagePumpAndroid() |
| michael@0 | 37 | { |
| michael@0 | 38 | } |
| michael@0 | 39 | |
| michael@0 | 40 | void MessagePumpForUI::Run(Delegate* delegate) { |
| michael@0 | 41 | RunState state; |
| michael@0 | 42 | state.delegate = delegate; |
| michael@0 | 43 | state.should_quit = false; |
| michael@0 | 44 | state.run_depth = state_ ? state_->run_depth + 1 : 1; |
| michael@0 | 45 | // We really only do a single task for each iteration of the loop. If we |
| michael@0 | 46 | // have done something, assume there is likely something more to do. This |
| michael@0 | 47 | // will mean that we don't block on the message pump until there was nothing |
| michael@0 | 48 | // more to do. We also set this to true to make sure not to block on the |
| michael@0 | 49 | // first iteration of the loop, so RunAllPending() works correctly. |
| michael@0 | 50 | state.more_work_is_plausible = true; |
| michael@0 | 51 | |
| michael@0 | 52 | RunState* previous_state = state_; |
| michael@0 | 53 | state_ = &state; |
| michael@0 | 54 | |
| michael@0 | 55 | // We run our own loop instead of using g_main_loop_quit in one of the |
| michael@0 | 56 | // callbacks. This is so we only quit our own loops, and we don't quit |
| michael@0 | 57 | // nested loops run by others. TODO(deanm): Is this what we want? |
| michael@0 | 58 | |
| michael@0 | 59 | while (!state_->should_quit) { |
| michael@0 | 60 | mozilla::ProcessNextEvent(); |
| michael@0 | 61 | if (work_scheduled) { |
| michael@0 | 62 | work_scheduled = false; |
| michael@0 | 63 | HandleDispatch(); |
| michael@0 | 64 | } |
| michael@0 | 65 | } |
| michael@0 | 66 | |
| michael@0 | 67 | state_ = previous_state; |
| michael@0 | 68 | } |
| michael@0 | 69 | |
| michael@0 | 70 | void MessagePumpForUI::HandleDispatch() { |
| michael@0 | 71 | // We should only ever have a single message on the wakeup pipe, since we |
| michael@0 | 72 | // are only signaled when the queue went from empty to non-empty. The qApp |
| michael@0 | 73 | // poll will tell us whether there was data, so this read shouldn't block. |
| michael@0 | 74 | if (state_->should_quit) |
| michael@0 | 75 | return; |
| michael@0 | 76 | |
| michael@0 | 77 | state_->more_work_is_plausible = false; |
| michael@0 | 78 | |
| michael@0 | 79 | if (state_->delegate->DoWork()) |
| michael@0 | 80 | state_->more_work_is_plausible = true; |
| michael@0 | 81 | |
| michael@0 | 82 | if (state_->should_quit) |
| michael@0 | 83 | return; |
| michael@0 | 84 | |
| michael@0 | 85 | if (state_->delegate->DoDelayedWork(&delayed_work_time_)) |
| michael@0 | 86 | state_->more_work_is_plausible = true; |
| michael@0 | 87 | if (state_->should_quit) |
| michael@0 | 88 | return; |
| michael@0 | 89 | |
| michael@0 | 90 | // Don't do idle work if we think there are more important things |
| michael@0 | 91 | // that we could be doing. |
| michael@0 | 92 | if (state_->more_work_is_plausible) |
| michael@0 | 93 | return; |
| michael@0 | 94 | |
| michael@0 | 95 | if (state_->delegate->DoIdleWork()) |
| michael@0 | 96 | state_->more_work_is_plausible = true; |
| michael@0 | 97 | if (state_->should_quit) |
| michael@0 | 98 | return; |
| michael@0 | 99 | } |
| michael@0 | 100 | |
| michael@0 | 101 | void MessagePumpForUI::Quit() { |
| michael@0 | 102 | if (state_) { |
| michael@0 | 103 | state_->should_quit = true; |
| michael@0 | 104 | } else { |
| michael@0 | 105 | NOTREACHED() << "Quit called outside Run!"; |
| michael@0 | 106 | } |
| michael@0 | 107 | } |
| michael@0 | 108 | |
| michael@0 | 109 | void MessagePumpForUI::ScheduleWork() { |
| michael@0 | 110 | // This can be called on any thread, so we don't want to touch any state |
| michael@0 | 111 | // variables as we would then need locks all over. This ensures that if |
| michael@0 | 112 | // we are sleeping in a poll that we will wake up. |
| michael@0 | 113 | work_scheduled = true; |
| michael@0 | 114 | mozilla::NotifyEvent(); |
| michael@0 | 115 | } |
| michael@0 | 116 | |
| michael@0 | 117 | void MessagePumpForUI::ScheduleDelayedWork(const TimeTicks& delayed_work_time) { |
| michael@0 | 118 | // We need to wake up the loop in case the poll timeout needs to be |
| michael@0 | 119 | // adjusted. This will cause us to try to do work, but that's ok. |
| michael@0 | 120 | delayed_work_time_ = delayed_work_time; |
| michael@0 | 121 | ScheduleWork(); |
| michael@0 | 122 | } |
| michael@0 | 123 | |
| michael@0 | 124 | } // namespace base |
