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Side by Side Diff: third_party/WebKit/Source/platform/scheduler/renderer/throttling_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_RENDERER_THROTTLING_HELPER_ H_ 5 #ifndef THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_THROTTLING_HELPER_ H_
6 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_THROTTLING_HELPER_ H_ 6 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_THROTTLING_HELPER_ H_
7 7
8 #include <set> 8 #include <set>
9 9
10 #include "base/macros.h" 10 #include "base/macros.h"
11 #include "platform/scheduler/base/cancelable_closure_holder.h" 11 #include "platform/scheduler/base/cancelable_closure_holder.h"
12 #include "platform/scheduler/base/time_domain.h" 12 #include "platform/scheduler/base/time_domain.h"
13 #include "public/platform/WebViewScheduler.h" 13 #include "public/platform/WebViewScheduler.h"
14 14
15 namespace blink { 15 namespace blink {
16 namespace scheduler { 16 namespace scheduler {
17 17
18 class RendererSchedulerImpl; 18 class RendererSchedulerImpl;
19 class ThrottledTimeDomain; 19 class ThrottledTimeDomain;
20 class WebFrameSchedulerImpl; 20 class WebFrameSchedulerImpl;
21 21
22 // The job of the ThrottlingHelper is to run tasks posted on throttled queues at
23 // most once per second. This is done by disabling throttled queues and running
24 // a special "heart beat" function |PumpThrottledTasks| which when run
25 // temporarily enables throttled queues and inserts a fence to ensure tasks
26 // posted from a throttled task run next time the queue is pumped.
27 //
28 // Of course the ThrottlingHelper isn't the only sub-system that wants to enable
29 // or disable queues. E.g. RendererSchedulerImpl also does this for policy
30 // reasons. To prevent the systems from fighting, clients of ThrottlingHelper
31 // must use SetQueueEnabled rather than calling the function directly on the
32 // queue.
33 //
34 // There may be more than one system that wishes to throttle a queue (e.g.
35 // renderer suspension vs tab level suspension) so the ThrottlingHelper keeps a
36 // count of the number of systems that wish a queue to be throttled.
37 // See IncreaseThrottleRefCount & DecreaseThrottleRefCount.
22 class BLINK_PLATFORM_EXPORT ThrottlingHelper : public TimeDomain::Observer { 38 class BLINK_PLATFORM_EXPORT ThrottlingHelper : public TimeDomain::Observer {
23 public: 39 public:
24 ThrottlingHelper(RendererSchedulerImpl* renderer_scheduler, 40 ThrottlingHelper(RendererSchedulerImpl* renderer_scheduler,
25 const char* tracing_category); 41 const char* tracing_category);
26 42
27 ~ThrottlingHelper() override; 43 ~ThrottlingHelper() override;
28 44
29 // TimeDomain::Observer implementation: 45 // TimeDomain::Observer implementation:
30 void OnTimeDomainHasImmediateWork() override; 46 void OnTimeDomainHasImmediateWork() override;
31 void OnTimeDomainHasDelayedWork() override; 47 void OnTimeDomainHasDelayedWork() override;
(...skipping 11 matching lines...) Expand all
43 void IncreaseThrottleRefCount(TaskQueue* task_queue); 59 void IncreaseThrottleRefCount(TaskQueue* task_queue);
44 60
45 // If the refcouint is non-zero it's decremented. If the throttled refcount 61 // If the refcouint is non-zero it's decremented. If the throttled refcount
46 // becomes zero then |task_queue| is unthrottled. If the refcount was already 62 // becomes zero then |task_queue| is unthrottled. If the refcount was already
47 // zero this function does nothing. 63 // zero this function does nothing.
48 void DecreaseThrottleRefCount(TaskQueue* task_queue); 64 void DecreaseThrottleRefCount(TaskQueue* task_queue);
49 65
50 // Removes |task_queue| from |throttled_queues_|. 66 // Removes |task_queue| from |throttled_queues_|.
51 void UnregisterTaskQueue(TaskQueue* task_queue); 67 void UnregisterTaskQueue(TaskQueue* task_queue);
52 68
69 // Returns true if the |task_queue| is throttled.
70 bool IsThrottled(TaskQueue* task_queue) const;
71
53 // Tells the ThrottlingHelper we're using virtual time, which disables all 72 // Tells the ThrottlingHelper we're using virtual time, which disables all
54 // throttling. 73 // throttling.
55 void EnableVirtualTime(); 74 void EnableVirtualTime();
56 75
57 const ThrottledTimeDomain* time_domain() const { return time_domain_.get(); } 76 const ThrottledTimeDomain* time_domain() const { return time_domain_.get(); }
58 77
59 static base::TimeTicks ThrottledRunTime(base::TimeTicks unthrottled_runtime); 78 static base::TimeTicks ThrottledRunTime(base::TimeTicks unthrottled_runtime);
60 79
61 const scoped_refptr<TaskQueue>& task_runner() const { return task_runner_; } 80 const scoped_refptr<TaskQueue>& task_runner() const { return task_runner_; }
62 81
(...skipping 33 matching lines...) Expand 10 before | Expand all | Expand 10 after
96 115
97 base::WeakPtrFactory<ThrottlingHelper> weak_factory_; 116 base::WeakPtrFactory<ThrottlingHelper> weak_factory_;
98 117
99 DISALLOW_COPY_AND_ASSIGN(ThrottlingHelper); 118 DISALLOW_COPY_AND_ASSIGN(ThrottlingHelper);
100 }; 119 };
101 120
102 } // namespace scheduler 121 } // namespace scheduler
103 } // namespace blink 122 } // namespace blink
104 123
105 #endif // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_THROTTLING_HELP ER_H_ 124 #endif // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_THROTTLING_HELP ER_H_
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