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1 // Copyright (c) 2015 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 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 #include "base/metrics/persistent_memory_allocator.h" | 5 #include "base/metrics/persistent_memory_allocator.h" |
6 | 6 |
7 #include <assert.h> | 7 #include <assert.h> |
8 #include <algorithm> | 8 #include <algorithm> |
9 | 9 |
10 #include "base/files/memory_mapped_file.h" | 10 #include "base/files/memory_mapped_file.h" |
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109 volatile std::atomic<uint32_t> tailptr; // Last block of iteration queue. | 109 volatile std::atomic<uint32_t> tailptr; // Last block of iteration queue. |
110 volatile BlockHeader queue; // Empty block for linked-list head/tail. | 110 volatile BlockHeader queue; // Empty block for linked-list head/tail. |
111 }; | 111 }; |
112 | 112 |
113 // The "queue" block header is used to detect "last node" so that zero/null | 113 // The "queue" block header is used to detect "last node" so that zero/null |
114 // can be used to indicate that it hasn't been added at all. It is part of | 114 // can be used to indicate that it hasn't been added at all. It is part of |
115 // the SharedMetadata structure which itself is always located at offset zero. | 115 // the SharedMetadata structure which itself is always located at offset zero. |
116 const PersistentMemoryAllocator::Reference | 116 const PersistentMemoryAllocator::Reference |
117 PersistentMemoryAllocator::kReferenceQueue = | 117 PersistentMemoryAllocator::kReferenceQueue = |
118 offsetof(SharedMetadata, queue); | 118 offsetof(SharedMetadata, queue); |
119 const PersistentMemoryAllocator::Reference | |
120 PersistentMemoryAllocator::kReferenceNull = 0; | |
121 | 119 |
122 PersistentMemoryAllocator::Iterator::Iterator( | 120 PersistentMemoryAllocator::Iterator::Iterator( |
123 const PersistentMemoryAllocator* allocator) | 121 const PersistentMemoryAllocator* allocator) |
124 : allocator_(allocator), last_record_(kReferenceQueue), record_count_(0) {} | 122 : allocator_(allocator), last_record_(kReferenceQueue), record_count_(0) {} |
125 | 123 |
126 PersistentMemoryAllocator::Iterator::Iterator( | 124 PersistentMemoryAllocator::Iterator::Iterator( |
127 const PersistentMemoryAllocator* allocator, | 125 const PersistentMemoryAllocator* allocator, |
128 Reference starting_after) | 126 Reference starting_after) |
129 : allocator_(allocator), last_record_(starting_after), record_count_(0) { | 127 : allocator_(allocator), last_record_(starting_after), record_count_(0) { |
130 // Ensure that the starting point is a valid, iterable block (meaning it can | 128 // Ensure that the starting point is a valid, iterable block (meaning it can |
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761 | 759 |
762 FilePersistentMemoryAllocator::~FilePersistentMemoryAllocator() {} | 760 FilePersistentMemoryAllocator::~FilePersistentMemoryAllocator() {} |
763 | 761 |
764 // static | 762 // static |
765 bool FilePersistentMemoryAllocator::IsFileAcceptable( | 763 bool FilePersistentMemoryAllocator::IsFileAcceptable( |
766 const MemoryMappedFile& file) { | 764 const MemoryMappedFile& file) { |
767 return IsMemoryAcceptable(file.data(), file.length(), 0, true); | 765 return IsMemoryAcceptable(file.data(), file.length(), 0, true); |
768 } | 766 } |
769 | 767 |
770 } // namespace base | 768 } // namespace base |
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