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

Issue 2836853003: scheduler: Use PLATFORM_EXPORT instead of BLINK_PLATFORM_EXPORT (Closed)
Patch Set: Rebased Created 3 years, 7 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/PlatformExport.h"
10 #include "platform/scheduler/base/cancelable_closure_holder.h" 11 #include "platform/scheduler/base/cancelable_closure_holder.h"
11 #include "platform/scheduler/base/task_queue_selector.h" 12 #include "platform/scheduler/base/task_queue_selector.h"
12 #include "platform/scheduler/child/scheduler_helper.h" 13 #include "platform/scheduler/child/scheduler_helper.h"
13 #include "public/platform/scheduler/child/single_thread_idle_task_runner.h" 14 #include "public/platform/scheduler/child/single_thread_idle_task_runner.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 // The job of the IdleHelper is to run idle tasks when the system is otherwise 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 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: 23 // at all. Idle tasks are subject to three levels of throttling:
24 // 24 //
25 // 1. Both idle queues are run a BEST_EFFORT priority (i.e. only selected if 25 // 1. Both idle queues are run a BEST_EFFORT priority (i.e. only selected if
26 // there is nothing else to do. 26 // there is nothing else to do.
27 // 2. The idle queues are only enabled during an idle period. 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. 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. 29 // This is achieved by inserting a fence into the queue.
30 // 30 //
31 // There are two types of idle periods: 31 // There are two types of idle periods:
32 // 1. Short idle period - typically less than 10ms run after begin main frame 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 33 // has finished, with the idle period ending at the compositor provided
34 // deadline. 34 // deadline.
35 // 2. Long idle periods - typically up to 50ms when no frames are being 35 // 2. Long idle periods - typically up to 50ms when no frames are being
36 // produced. 36 // produced.
37 // 37 //
38 // Idle tasks are supplied a deadline, and should endeavor to finished before it 38 // Idle tasks are supplied a deadline, and should endeavor to finished before it
39 // ends to avoid jank. 39 // ends to avoid jank.
40 class BLINK_PLATFORM_EXPORT IdleHelper 40 class PLATFORM_EXPORT IdleHelper : public base::MessageLoop::TaskObserver,
41 : public base::MessageLoop::TaskObserver, 41 public SingleThreadIdleTaskRunner::Delegate {
42 public SingleThreadIdleTaskRunner::Delegate {
43 public: 42 public:
44 // Used to by scheduler implementations to customize idle behaviour. 43 // Used to by scheduler implementations to customize idle behaviour.
45 class BLINK_PLATFORM_EXPORT Delegate { 44 class PLATFORM_EXPORT Delegate {
46 public: 45 public:
47 Delegate(); 46 Delegate();
48 virtual ~Delegate(); 47 virtual ~Delegate();
49 48
50 // If it's ok to enter a long idle period, return true. Otherwise return 49 // If it's ok to enter a long idle period, return true. Otherwise return
51 // false and set next_long_idle_period_delay_out so we know when to try 50 // false and set next_long_idle_period_delay_out so we know when to try
52 // again. 51 // again.
53 virtual bool CanEnterLongIdlePeriod( 52 virtual bool CanEnterLongIdlePeriod(
54 base::TimeTicks now, 53 base::TimeTicks now,
55 base::TimeDelta* next_long_idle_period_delay_out) = 0; 54 base::TimeDelta* next_long_idle_period_delay_out) = 0;
(...skipping 184 matching lines...) Expand 10 before | Expand all | Expand 10 after
240 base::WeakPtr<IdleHelper> weak_idle_helper_ptr_; 239 base::WeakPtr<IdleHelper> weak_idle_helper_ptr_;
241 base::WeakPtrFactory<IdleHelper> weak_factory_; 240 base::WeakPtrFactory<IdleHelper> weak_factory_;
242 241
243 DISALLOW_COPY_AND_ASSIGN(IdleHelper); 242 DISALLOW_COPY_AND_ASSIGN(IdleHelper);
244 }; 243 };
245 244
246 } // namespace scheduler 245 } // namespace scheduler
247 } // namespace blink 246 } // namespace blink
248 247
249 #endif // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_IDLE_HELPER_H_ 248 #endif // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_IDLE_HELPER_H_
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