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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" | |
8 #include "base/observer_list_threadsafe.h" | |
9 #include "base/trace_event/trace_event.h" | 7 #include "base/trace_event/trace_event.h" |
10 | 8 |
11 namespace base { | 9 namespace base { |
12 | 10 |
13 namespace { | 11 namespace { |
14 | 12 |
15 // ObserverListThreadSafe is RefCountedThreadSafe, this traits is needed | |
16 // to ensure the LazyInstance will hold a reference to it. | |
17 struct LeakyLazyObserverListTraits : | |
18 base::internal::LeakyLazyInstanceTraits< | |
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; | |
28 } | |
29 }; | |
30 | |
31 LazyInstance< | |
32 ObserverListThreadSafe<MemoryPressureListener>, | |
33 LeakyLazyObserverListTraits> g_observers = LAZY_INSTANCE_INITIALIZER; | |
34 | |
35 // All memory pressure notifications within this process will be suppressed if | |
36 // this variable is set to 1. | |
37 subtle::Atomic32 g_notifications_suppressed = 0; | 13 subtle::Atomic32 g_notifications_suppressed = 0; |
38 | 14 |
39 } // namespace | 15 } // namespace |
40 | 16 |
17 //static | |
18 MemoryPressureListener* MemoryPressureListener::g_listener = | |
19 new MemoryPressureListener(); | |
Mark Mentovai
2016/04/20 13:21:33
This results in a module initializer. Can’t do tha
hong.zheng
2016/04/21 12:18:04
Done.
| |
20 | |
21 MemoryPressureListener::MemoryPressureListener() | |
22 : observers_(LAZY_INSTANCE_INITIALIZER), | |
23 sync_observers_(LAZY_INSTANCE_INITIALIZER), | |
24 sync_observers_lock_(LAZY_INSTANCE_INITIALIZER) {} | |
25 | |
41 MemoryPressureListener::MemoryPressureListener( | 26 MemoryPressureListener::MemoryPressureListener( |
42 const MemoryPressureListener::MemoryPressureCallback& callback) | 27 const MemoryPressureListener::MemoryPressureCallback& callback) |
43 : callback_(callback) { | 28 : callback_(callback) { |
44 g_observers.Get().AddObserver(this); | 29 g_listener->observers_.Get().AddObserver(this); |
30 } | |
31 | |
32 MemoryPressureListener::MemoryPressureListener( | |
33 const MemoryPressureListener::MemoryPressureCallback& callback, | |
34 const MemoryPressureListener::SyncMemoryPressureCallback& | |
35 sync_memory_pressure_callback) | |
36 : callback_(callback), | |
37 sync_memory_pressure_callback_(sync_memory_pressure_callback) { | |
38 g_listener->observers_.Get().AddObserver(this); | |
39 base::AutoLock lock(g_listener->sync_observers_lock_.Get()); | |
40 g_listener->sync_observers_.Get().AddObserver(this); | |
45 } | 41 } |
46 | 42 |
47 MemoryPressureListener::~MemoryPressureListener() { | 43 MemoryPressureListener::~MemoryPressureListener() { |
48 g_observers.Get().RemoveObserver(this); | 44 g_listener->observers_.Get().RemoveObserver(this); |
45 base::AutoLock lock(g_listener->sync_observers_lock_.Get()); | |
46 g_listener->sync_observers_.Get().RemoveObserver(this); | |
49 } | 47 } |
50 | 48 |
51 void MemoryPressureListener::Notify(MemoryPressureLevel memory_pressure_level) { | 49 void MemoryPressureListener::Notify(MemoryPressureLevel memory_pressure_level) { |
52 callback_.Run(memory_pressure_level); | 50 callback_.Run(memory_pressure_level); |
53 } | 51 } |
54 | 52 |
53 void MemoryPressureListener::SyncNotify( | |
54 MemoryPressureLevel memory_pressure_level) { | |
55 if (!sync_memory_pressure_callback_.is_null()) { | |
56 sync_memory_pressure_callback_.Run(memory_pressure_level); | |
57 } | |
58 } | |
59 | |
55 // static | 60 // static |
56 void MemoryPressureListener::NotifyMemoryPressure( | 61 void MemoryPressureListener::NotifyMemoryPressure( |
57 MemoryPressureLevel memory_pressure_level) { | 62 MemoryPressureLevel memory_pressure_level) { |
58 DCHECK_NE(memory_pressure_level, MEMORY_PRESSURE_LEVEL_NONE); | 63 DCHECK_NE(memory_pressure_level, MEMORY_PRESSURE_LEVEL_NONE); |
59 TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("memory-infra"), | 64 TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("memory-infra"), |
60 "MemoryPressureListener::NotifyMemoryPressure", | 65 "MemoryPressureListener::NotifyMemoryPressure", |
61 TRACE_EVENT_SCOPE_THREAD, "level", | 66 TRACE_EVENT_SCOPE_THREAD, "level", |
62 memory_pressure_level); | 67 memory_pressure_level); |
63 if (AreNotificationsSuppressed()) | 68 if (AreNotificationsSuppressed()) |
64 return; | 69 return; |
(...skipping 14 matching lines...) Expand all Loading... | |
79 void MemoryPressureListener::SimulatePressureNotification( | 84 void MemoryPressureListener::SimulatePressureNotification( |
80 MemoryPressureLevel memory_pressure_level) { | 85 MemoryPressureLevel memory_pressure_level) { |
81 // Notify all listeners even if regular pressure notifications are suppressed. | 86 // Notify all listeners even if regular pressure notifications are suppressed. |
82 DoNotifyMemoryPressure(memory_pressure_level); | 87 DoNotifyMemoryPressure(memory_pressure_level); |
83 } | 88 } |
84 | 89 |
85 // static | 90 // static |
86 void MemoryPressureListener::DoNotifyMemoryPressure( | 91 void MemoryPressureListener::DoNotifyMemoryPressure( |
87 MemoryPressureLevel memory_pressure_level) { | 92 MemoryPressureLevel memory_pressure_level) { |
88 DCHECK_NE(memory_pressure_level, MEMORY_PRESSURE_LEVEL_NONE); | 93 DCHECK_NE(memory_pressure_level, MEMORY_PRESSURE_LEVEL_NONE); |
89 g_observers.Get().Notify(FROM_HERE, &MemoryPressureListener::Notify, | 94 |
90 memory_pressure_level); | 95 g_listener->observers_.Get().Notify(FROM_HERE, |
96 &MemoryPressureListener::Notify, memory_pressure_level); | |
97 base::AutoLock lock(g_listener->sync_observers_lock_.Get()); | |
98 FOR_EACH_OBSERVER( | |
99 MemoryPressureListener, g_listener->sync_observers_.Get(), | |
100 SyncNotify(memory_pressure_level)); | |
91 } | 101 } |
92 | 102 |
93 } // namespace base | 103 } // namespace base |
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