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Side by Side Diff: components/discardable_memory/common/discardable_shared_memory_heap.h

Issue 2459733002: Move discardable memory to //components from //content (Closed)
Patch Set: Fix build error Created 4 years, 1 month ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved. 1 // Copyright 2014 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 CONTENT_COMMON_DISCARDABLE_SHARED_MEMORY_HEAP_H_ 5 #ifndef COMPONENTS_DISCARDABLE_MEMORY_COMMON_DISCARDABLE_SHARED_MEMORY_HEAP_H_
6 #define CONTENT_COMMON_DISCARDABLE_SHARED_MEMORY_HEAP_H_ 6 #define COMPONENTS_DISCARDABLE_MEMORY_COMMON_DISCARDABLE_SHARED_MEMORY_HEAP_H_
7 7
8 #include <stddef.h> 8 #include <stddef.h>
9 #include <stdint.h> 9 #include <stdint.h>
10 10
11 #include <memory> 11 #include <memory>
12 12
13 #include "base/callback.h" 13 #include "base/callback.h"
14 #include "base/containers/hash_tables.h" 14 #include "base/containers/hash_tables.h"
15 #include "base/containers/linked_list.h" 15 #include "base/containers/linked_list.h"
16 #include "base/macros.h" 16 #include "base/macros.h"
17 #include "base/memory/scoped_vector.h" 17 #include "base/memory/scoped_vector.h"
18 #include "base/trace_event/process_memory_dump.h" 18 #include "base/trace_event/process_memory_dump.h"
19 #include "content/common/content_export.h" 19 #include "components/discardable_memory/common/discardable_memory_export.h"
20 20
21 namespace base { 21 namespace base {
22 class DiscardableSharedMemory; 22 class DiscardableSharedMemory;
23 } 23 }
24 24
25 namespace content { 25 namespace discardable_memory {
26 26
27 // Implements a heap of discardable shared memory. An array of free lists 27 // Implements a heap of discardable shared memory. An array of free lists
28 // is used to keep track of free blocks. 28 // is used to keep track of free blocks.
29 class CONTENT_EXPORT DiscardableSharedMemoryHeap { 29 class DISCARDABLE_MEMORY_EXPORT DiscardableSharedMemoryHeap {
30 public: 30 public:
31 class CONTENT_EXPORT Span : public base::LinkNode<Span> { 31 class DISCARDABLE_MEMORY_EXPORT Span : public base::LinkNode<Span> {
32 public: 32 public:
33 ~Span(); 33 ~Span();
34 34
35 base::DiscardableSharedMemory* shared_memory() { return shared_memory_; } 35 base::DiscardableSharedMemory* shared_memory() { return shared_memory_; }
36 size_t start() const { return start_; } 36 size_t start() const { return start_; }
37 size_t length() const { return length_; } 37 size_t length() const { return length_; }
38 void set_is_locked(bool is_locked) { is_locked_ = is_locked; } 38 void set_is_locked(bool is_locked) { is_locked_ = is_locked; }
39 39
40 private: 40 private:
41 friend class DiscardableSharedMemoryHeap; 41 friend class DiscardableSharedMemoryHeap;
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174 174
175 // Array of linked-lists with free discardable memory regions. For i < 256, 175 // Array of linked-lists with free discardable memory regions. For i < 256,
176 // where the 1st entry is located at index 0 of the array, the kth entry 176 // where the 1st entry is located at index 0 of the array, the kth entry
177 // is a free list of runs that consist of k blocks. The 256th entry is a 177 // is a free list of runs that consist of k blocks. The 256th entry is a
178 // free list of runs that have length >= 256 blocks. 178 // free list of runs that have length >= 256 blocks.
179 base::LinkedList<Span> free_spans_[256]; 179 base::LinkedList<Span> free_spans_[256];
180 180
181 DISALLOW_COPY_AND_ASSIGN(DiscardableSharedMemoryHeap); 181 DISALLOW_COPY_AND_ASSIGN(DiscardableSharedMemoryHeap);
182 }; 182 };
183 183
184 } // namespace content 184 } // namespace discardable_memory
185 185
186 #endif // CONTENT_COMMON_DISCARDABLE_SHARED_MEMORY_HEAP_H_ 186 #endif // COMPONENTS_DISCARDABLE_MEMORY_COMMON_DISCARDABLE_SHARED_MEMORY_HEAP_H _
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