40 lines
1.1 KiB
D
40 lines
1.1 KiB
D
module ecs.block_allocator;
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import ecs.manager;
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import std.experimental.allocator;
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import std.experimental.allocator.mallocator : AlignedMallocator, Mallocator;
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struct BlockAllocator(uint block_size, uint blocks_in_allocation)
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{
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void* next_block = null;
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void* getBlock()
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{
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if (next_block is null)
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allocBlock();
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void* ret = next_block;
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next_block = *cast(void**) next_block;
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return ret;
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}
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void freeBlock(void* block)
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{
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*cast(void**)block = next_block;
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next_block = block;
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}
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private void allocBlock()
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{
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next_block = cast(void*) AlignedMallocator.instance.alignedAllocate(
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block_size * blocks_in_allocation, block_size);
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foreach (i; 0 .. blocks_in_allocation - 1)
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{
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void** pointer = cast(void**)(next_block + i * block_size);
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*pointer = next_block + (i + 1) * block_size;
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}
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void** pointer = cast(void**)(
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next_block + (blocks_in_allocation - 1) * block_size);
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*pointer = null;
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}
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}
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