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65 lines
1.9 KiB
65 lines
1.9 KiB
4 months ago
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// Copyright 2018 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "android/base/Allocator.h"
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#include <unordered_set>
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#include <inttypes.h>
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#include <stddef.h>
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#include <string.h>
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namespace android {
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namespace base {
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// Class to make it easier to set up memory regions where it is fast
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// to allocate/deallocate buffers that have size within
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// the specified range.
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class Pool : public Allocator {
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public:
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// minSize/maxSize: the target range of sizes for which we want to
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// make allocations fast. the greater the range, the more space
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// traded off.
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// chunksPerSize: the target maximum number of live objects of
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// each size that are expected. the higher it is, the more space
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// traded off.
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//
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// Rough space cost formula:
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// O(chunksPerSize * log2(maxSize / minSize) * maxSize)
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Pool(size_t minSize = 4,
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size_t maxSize = 4096,
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size_t chunksPerSize = 1024);
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// All memory allocated by this pool
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// is automatically deleted when the pool
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// is deconstructed.
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~Pool();
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void* alloc(size_t wantedSize) override;
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void free(void* ptr);
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// Convenience function to free everything currently allocated.
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void freeAll();
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private:
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class Impl;
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Impl* mImpl = nullptr;
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std::unordered_set<void*> mFallbackPtrs;
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};
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} // namespace base
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} // namespace android
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