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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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 #include "base/memory/memory_pressure_listener.h" | 5 #include "base/memory/memory_pressure_listener.h" |
6 | 6 |
7 #include "base/lazy_instance.h" | 7 #include "base/lazy_instance.h" |
8 #include "base/observer_list_threadsafe.h" | 8 #include "base/observer_list_threadsafe.h" |
9 #include "base/trace_event/trace_event.h" | 9 #include "base/trace_event/trace_event.h" |
10 | 10 |
11 namespace base { | 11 namespace base { |
12 | 12 |
13 namespace { | 13 namespace { |
14 | 14 |
15 class MemoryPressureObserver { | 15 // ObserverListThreadSafe is RefCountedThreadSafe, this traits is needed |
16 public: | 16 // to ensure the LazyInstance will hold a reference to it. |
17 MemoryPressureObserver() | 17 struct LeakyLazyObserverListTraits : |
18 : async_observers_(new ObserverListThreadSafe<MemoryPressureListener>), | 18 base::internal::LeakyLazyInstanceTraits< |
19 sync_observers_(new ObserverList<MemoryPressureListener>) { | 19 ObserverListThreadSafe<MemoryPressureListener> > { |
| 20 static ObserverListThreadSafe<MemoryPressureListener>* |
| 21 New(void* instance) { |
| 22 ObserverListThreadSafe<MemoryPressureListener>* ret = |
| 23 base::internal::LeakyLazyInstanceTraits< |
| 24 ObserverListThreadSafe<MemoryPressureListener>>::New(instance); |
| 25 // Leaky. |
| 26 ret->AddRef(); |
| 27 return ret; |
20 } | 28 } |
21 | |
22 void AddObserver(MemoryPressureListener* listener, bool sync) { | |
23 async_observers_->AddObserver(listener); | |
24 if (sync) { | |
25 AutoLock lock(sync_observers_lock_); | |
26 sync_observers_->AddObserver(listener); | |
27 } | |
28 } | |
29 | |
30 void RemoveObserver(MemoryPressureListener* listener) { | |
31 async_observers_->RemoveObserver(listener); | |
32 AutoLock lock(sync_observers_lock_); | |
33 sync_observers_->RemoveObserver(listener); | |
34 } | |
35 | |
36 void Notify(MemoryPressureListener::MemoryPressureLevel | |
37 memory_pressure_level) { | |
38 async_observers_->Notify(FROM_HERE, | |
39 &MemoryPressureListener::Notify, memory_pressure_level); | |
40 AutoLock lock(sync_observers_lock_); | |
41 FOR_EACH_OBSERVER(MemoryPressureListener, *sync_observers_, | |
42 MemoryPressureListener::SyncNotify(memory_pressure_level)); | |
43 } | |
44 | |
45 private: | |
46 scoped_refptr<ObserverListThreadSafe<MemoryPressureListener>> | |
47 async_observers_; | |
48 ObserverList<MemoryPressureListener>* sync_observers_; | |
49 Lock sync_observers_lock_; | |
50 | |
51 DISALLOW_COPY_AND_ASSIGN(MemoryPressureObserver); | |
52 }; | 29 }; |
53 | 30 |
54 LazyInstance<MemoryPressureObserver>::Leaky g_observer = | 31 LazyInstance< |
55 LAZY_INSTANCE_INITIALIZER; | 32 ObserverListThreadSafe<MemoryPressureListener>, |
| 33 LeakyLazyObserverListTraits> g_observers = LAZY_INSTANCE_INITIALIZER; |
56 | 34 |
| 35 // All memory pressure notifications within this process will be suppressed if |
| 36 // this variable is set to 1. |
57 subtle::Atomic32 g_notifications_suppressed = 0; | 37 subtle::Atomic32 g_notifications_suppressed = 0; |
58 | 38 |
59 } // namespace | 39 } // namespace |
60 | 40 |
61 MemoryPressureListener::MemoryPressureListener( | 41 MemoryPressureListener::MemoryPressureListener( |
62 const MemoryPressureListener::MemoryPressureCallback& callback) | 42 const MemoryPressureListener::MemoryPressureCallback& callback) |
63 : callback_(callback) { | 43 : callback_(callback) { |
64 g_observer.Get().AddObserver(this, false); | 44 g_observers.Get().AddObserver(this); |
65 } | |
66 | |
67 MemoryPressureListener::MemoryPressureListener( | |
68 const MemoryPressureListener::MemoryPressureCallback& callback, | |
69 const MemoryPressureListener::SyncMemoryPressureCallback& | |
70 sync_memory_pressure_callback) | |
71 : callback_(callback), | |
72 sync_memory_pressure_callback_(sync_memory_pressure_callback) { | |
73 g_observer.Get().AddObserver(this, true); | |
74 } | 45 } |
75 | 46 |
76 MemoryPressureListener::~MemoryPressureListener() { | 47 MemoryPressureListener::~MemoryPressureListener() { |
77 g_observer.Get().RemoveObserver(this); | 48 g_observers.Get().RemoveObserver(this); |
78 } | 49 } |
79 | 50 |
80 void MemoryPressureListener::Notify(MemoryPressureLevel memory_pressure_level) { | 51 void MemoryPressureListener::Notify(MemoryPressureLevel memory_pressure_level) { |
81 callback_.Run(memory_pressure_level); | 52 callback_.Run(memory_pressure_level); |
82 } | 53 } |
83 | 54 |
84 void MemoryPressureListener::SyncNotify( | |
85 MemoryPressureLevel memory_pressure_level) { | |
86 if (!sync_memory_pressure_callback_.is_null()) { | |
87 sync_memory_pressure_callback_.Run(memory_pressure_level); | |
88 } | |
89 } | |
90 | |
91 // static | 55 // static |
92 void MemoryPressureListener::NotifyMemoryPressure( | 56 void MemoryPressureListener::NotifyMemoryPressure( |
93 MemoryPressureLevel memory_pressure_level) { | 57 MemoryPressureLevel memory_pressure_level) { |
94 DCHECK_NE(memory_pressure_level, MEMORY_PRESSURE_LEVEL_NONE); | 58 DCHECK_NE(memory_pressure_level, MEMORY_PRESSURE_LEVEL_NONE); |
95 TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("memory-infra"), | 59 TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("memory-infra"), |
96 "MemoryPressureListener::NotifyMemoryPressure", | 60 "MemoryPressureListener::NotifyMemoryPressure", |
97 TRACE_EVENT_SCOPE_THREAD, "level", | 61 TRACE_EVENT_SCOPE_THREAD, "level", |
98 memory_pressure_level); | 62 memory_pressure_level); |
99 if (AreNotificationsSuppressed()) | 63 if (AreNotificationsSuppressed()) |
100 return; | 64 return; |
(...skipping 14 matching lines...) Expand all Loading... |
115 void MemoryPressureListener::SimulatePressureNotification( | 79 void MemoryPressureListener::SimulatePressureNotification( |
116 MemoryPressureLevel memory_pressure_level) { | 80 MemoryPressureLevel memory_pressure_level) { |
117 // Notify all listeners even if regular pressure notifications are suppressed. | 81 // Notify all listeners even if regular pressure notifications are suppressed. |
118 DoNotifyMemoryPressure(memory_pressure_level); | 82 DoNotifyMemoryPressure(memory_pressure_level); |
119 } | 83 } |
120 | 84 |
121 // static | 85 // static |
122 void MemoryPressureListener::DoNotifyMemoryPressure( | 86 void MemoryPressureListener::DoNotifyMemoryPressure( |
123 MemoryPressureLevel memory_pressure_level) { | 87 MemoryPressureLevel memory_pressure_level) { |
124 DCHECK_NE(memory_pressure_level, MEMORY_PRESSURE_LEVEL_NONE); | 88 DCHECK_NE(memory_pressure_level, MEMORY_PRESSURE_LEVEL_NONE); |
125 | 89 g_observers.Get().Notify(FROM_HERE, &MemoryPressureListener::Notify, |
126 g_observer.Get().Notify(memory_pressure_level); | 90 memory_pressure_level); |
127 } | 91 } |
128 | 92 |
129 } // namespace base | 93 } // namespace base |
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