103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
#ifndef VOXEL_MEMORY_POOL_H
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#define VOXEL_MEMORY_POOL_H
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#include "../util/fixed_array.h"
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#include "../util/math/funcs.h"
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#include "core/os/mutex.h"
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#include <limits>
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#include <unordered_set>
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#include <vector>
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// Pool based on a scenario where allocated blocks are often the same size.
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// A pool of blocks is assigned for each power of two.
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// The majority of VoxelBuffers use powers of two so most of the time
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// we won't waste memory. Sometimes non-power-of-two buffers are created,
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// but they are often temporary and less numerous.
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class VoxelMemoryPool {
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private:
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#ifdef DEBUG_ENABLED
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struct DebugUsedBlocks {
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Mutex mutex;
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std::unordered_set<void *> blocks;
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void add(void *block) {
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MutexLock lock(mutex);
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auto it = blocks.find(block);
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// Must not add twice
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CRASH_COND(it != blocks.end());
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blocks.insert(block);
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}
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void remove(void *block) {
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MutexLock lock(mutex);
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auto it = blocks.find(block);
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// Must exist
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CRASH_COND(it == blocks.end());
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blocks.erase(it);
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}
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};
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#endif
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struct Pool {
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Mutex mutex;
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// Would a linked list be better?
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std::vector<uint8_t *> blocks;
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#ifdef DEBUG_ENABLED
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DebugUsedBlocks debug_used_blocks;
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#endif
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};
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public:
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static void create_singleton();
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static void destroy_singleton();
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static VoxelMemoryPool *get_singleton();
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VoxelMemoryPool();
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~VoxelMemoryPool();
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uint8_t *allocate(size_t size);
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void recycle(uint8_t *block, size_t size);
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void clear_unused_blocks();
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void debug_print();
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unsigned int debug_get_used_blocks() const;
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size_t debug_get_used_memory() const;
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size_t debug_get_total_memory() const;
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private:
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void clear();
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inline size_t get_highest_supported_size() const {
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return size_t(1) << (_pot_pools.size() - 1);
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}
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inline unsigned int get_pool_index_from_size(size_t size) const {
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#ifdef DEBUG_ENABLED
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// `get_next_power_of_two_32` takes unsigned int
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CRASH_COND(size > std::numeric_limits<unsigned int>::max());
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#endif
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return get_shift_from_power_of_two_32(get_next_power_of_two_32(size));
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}
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inline size_t get_size_from_pool_index(unsigned int i) const {
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return size_t(1) << i;
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}
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// We handle allocations with up to 2^20 = 1,048,576 bytes.
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// This is chosen based on practical needs.
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// Each slot in this array corresponds to allocations
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// that contain 2^index bytes in them.
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FixedArray<Pool, 21> _pot_pools;
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#ifdef DEBUG_ENABLED
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DebugUsedBlocks _debug_nonpooled_used_blocks;
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#endif
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unsigned int _used_blocks = 0; // TODO Make atomic?
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size_t _used_memory = 0;
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size_t _total_memory = 0;
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};
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#endif // VOXEL_MEMORY_POOL_H
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