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Side by Side Diff: third_party/WebKit/Source/platform/scheduler/child/idle_helper.h

Issue 2276353002: Remove after wakeup logic and replace PumpTask with Fences (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Slight simplification Created 4 years, 3 months ago
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1 // Copyright 2015 The Chromium Authors. All rights reserved. 1 // Copyright 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_IDLE_HELPER_H_ 5 #ifndef THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_IDLE_HELPER_H_
6 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_IDLE_HELPER_H_ 6 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_IDLE_HELPER_H_
7 7
8 #include "base/macros.h" 8 #include "base/macros.h"
9 #include "base/message_loop/message_loop.h" 9 #include "base/message_loop/message_loop.h"
10 #include "platform/scheduler/base/cancelable_closure_holder.h" 10 #include "platform/scheduler/base/cancelable_closure_holder.h"
11 #include "platform/scheduler/base/task_queue_selector.h" 11 #include "platform/scheduler/base/task_queue_selector.h"
12 #include "platform/scheduler/child/scheduler_helper.h" 12 #include "platform/scheduler/child/scheduler_helper.h"
13 #include "public/platform/scheduler/child/single_thread_idle_task_runner.h" 13 #include "public/platform/scheduler/child/single_thread_idle_task_runner.h"
14 #include "public/platform/WebCommon.h" 14 #include "public/platform/WebCommon.h"
15 15
16 namespace blink { 16 namespace blink {
17 namespace scheduler { 17 namespace scheduler {
18 18
19 class SchedulerHelper; 19 class SchedulerHelper;
20 20
21 // Common scheduler functionality for Idle tasks. 21 // The job of the IdleHelper is to run idle tasks when the system is otherwise
22 // idle. Idle tasks should be optional work, with no guarantee they will be run
23 // at all. Idle tasks are subject to three levels of throttling:
24 //
25 // 1. Both idle queues are run a BEST_EFFORT priority (i.e. only selected if
26 // there is nothing else to do.
27 // 2. The idle queues are only enabled during an idle period.
28 // 3. Idle tasks posted from within an idle task run in the next idle period.
29 // This is achieved by inserting a fence into the queue.
30 //
31 // There are two types of idle periods:
32 // 1. Short idle period - typically less than 10ms run after begin main frame
33 // has finished, with the idle period ending at the compositor provided
34 // deadline.
35 // 2. Long idle periods - typically up to 50ms when no frames are being
36 // produced.
37 //
38 // Idle tasks are supplied a deadline, and should endeavor to finished before it
39 // ends to avoid jank.
22 class BLINK_PLATFORM_EXPORT IdleHelper 40 class BLINK_PLATFORM_EXPORT IdleHelper
23 : public base::MessageLoop::TaskObserver, 41 : public base::MessageLoop::TaskObserver,
24 public SingleThreadIdleTaskRunner::Delegate { 42 public SingleThreadIdleTaskRunner::Delegate {
25 public: 43 public:
26 // Used to by scheduler implementations to customize idle behaviour. 44 // Used to by scheduler implementations to customize idle behaviour.
27 class BLINK_PLATFORM_EXPORT Delegate { 45 class BLINK_PLATFORM_EXPORT Delegate {
28 public: 46 public:
29 Delegate(); 47 Delegate();
30 virtual ~Delegate(); 48 virtual ~Delegate();
31 49
(...skipping 182 matching lines...) Expand 10 before | Expand all | Expand 10 after
214 base::WeakPtr<IdleHelper> weak_idle_helper_ptr_; 232 base::WeakPtr<IdleHelper> weak_idle_helper_ptr_;
215 base::WeakPtrFactory<IdleHelper> weak_factory_; 233 base::WeakPtrFactory<IdleHelper> weak_factory_;
216 234
217 DISALLOW_COPY_AND_ASSIGN(IdleHelper); 235 DISALLOW_COPY_AND_ASSIGN(IdleHelper);
218 }; 236 };
219 237
220 } // namespace scheduler 238 } // namespace scheduler
221 } // namespace blink 239 } // namespace blink
222 240
223 #endif // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_IDLE_HELPER_H_ 241 #endif // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_IDLE_HELPER_H_
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