58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
/**
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******************************************************************************
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* Xenia : Xbox 360 Emulator Research Project *
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******************************************************************************
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* Copyright 2015 Ben Vanik. All rights reserved. *
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* Released under the BSD license - see LICENSE in the root for more details. *
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******************************************************************************
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*/
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#ifndef XENIA_BASE_BIT_MAP_H_
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#define XENIA_BASE_BIT_MAP_H_
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#include <cstddef>
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#include <cstdint>
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#include <vector>
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namespace xe {
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// Bit Map: Efficient lookup of free/used entries.
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class BitMap {
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public:
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BitMap();
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// Size is the number of entries, must be a multiple of 64.
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BitMap(size_t size_bits);
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// Data does not have to be aligned to a 4-byte boundary, but it is
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// preferable.
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// Size is the number of entries, must be a multiple of 64.
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BitMap(uint64_t* data, size_t size_bits);
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// (threadsafe) Acquires an entry and returns its index. Returns -1 if there
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// are no more free entries.
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size_t Acquire();
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size_t AcquireFromBack();
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// (threadsafe) Releases an entry by an index.
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void Release(size_t index);
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// Resize the bitmap. Size is the number of entries, must be a multiple of 64.
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void Resize(size_t new_size_bits);
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// Sets all entries to free.
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void Reset();
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const std::vector<uint64_t> data() const { return data_; }
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std::vector<uint64_t>& data() { return data_; }
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private:
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constexpr static size_t kDataSize = 8;
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constexpr static size_t kDataSizeBits = kDataSize * 8;
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std::vector<uint64_t> data_;
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inline size_t TryAcquireAt(size_t i);
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};
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} // namespace xe
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#endif // XENIA_BASE_BIT_MAP_H_
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