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Diffstat (limited to 'chromium/base/memory/discardable_memory_allocator_android.h')
-rw-r--r-- | chromium/base/memory/discardable_memory_allocator_android.h | 65 |
1 files changed, 0 insertions, 65 deletions
diff --git a/chromium/base/memory/discardable_memory_allocator_android.h b/chromium/base/memory/discardable_memory_allocator_android.h deleted file mode 100644 index 7991656cff6..00000000000 --- a/chromium/base/memory/discardable_memory_allocator_android.h +++ /dev/null @@ -1,65 +0,0 @@ -// Copyright 2013 The Chromium Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. - -#ifndef BASE_MEMORY_DISCARDABLE_MEMORY_ALLOCATOR_H_ -#define BASE_MEMORY_DISCARDABLE_MEMORY_ALLOCATOR_H_ - -#include <string> - -#include "base/base_export.h" -#include "base/basictypes.h" -#include "base/memory/scoped_ptr.h" -#include "base/memory/scoped_vector.h" -#include "base/synchronization/lock.h" -#include "base/threading/thread_checker.h" - -namespace base { - -class DiscardableMemory; - -namespace internal { - -// On Android ashmem is used to implement discardable memory. It is backed by a -// file (descriptor) thus is a limited resource. This allocator minimizes the -// problem by allocating large ashmem regions internally and returning smaller -// chunks to the client. -// Allocated chunks are systematically aligned on a page boundary therefore this -// allocator should not be used for small allocations. -// -// Threading: The allocator must be deleted on the thread it was constructed on -// although its Allocate() method can be invoked on any thread. See -// discardable_memory.h for DiscardableMemory's threading guarantees. -class BASE_EXPORT_PRIVATE DiscardableMemoryAllocator { - public: - // Exposed for testing. - enum { - kMinAshmemRegionSize = 32 * 1024 * 1024, - }; - - // Note that |name| is only used for debugging/measurement purposes. - explicit DiscardableMemoryAllocator(const std::string& name); - ~DiscardableMemoryAllocator(); - - // Note that the allocator must outlive the returned DiscardableMemory - // instance. - scoped_ptr<DiscardableMemory> Allocate(size_t size); - - private: - class AshmemRegion; - class DiscardableAshmemChunk; - - void DeleteAshmemRegion_Locked(AshmemRegion* region); - - base::ThreadChecker thread_checker_; - const std::string name_; - base::Lock lock_; - ScopedVector<AshmemRegion> ashmem_regions_; - - DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryAllocator); -}; - -} // namespace internal -} // namespace base - -#endif // BASE_MEMORY_DISCARDABLE_MEMORY_ALLOCATOR_H_ |