mem_allocator_ring.hxx

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#pragma once
#include <ice/mem_allocator.hxx>
 
namespace ice
{
 
    struct RingAllocatorParams
    {
        ice::usize ring_buffer_size = 4_KiB;
    };
 
    struct RingAllocator : public ice::Allocator
    {
        RingAllocator(
            ice::Allocator& backing_allocator,
            ice::RingAllocatorParams params = { },
            std::source_location = std::source_location::current()
        ) noexcept;
 
        RingAllocator(
            ice::Allocator& backing_allocator,
            std::string_view name,
            ice::RingAllocatorParams params = { },
            std::source_location = std::source_location::current()
        ) noexcept;
 
        ~RingAllocator() noexcept;

        void reset() noexcept;
 
    protected:
        struct MemoryBucket;
 
        auto do_allocate(ice::AllocRequest request) noexcept -> ice::AllocResult override;
        void do_deallocate(void* pointer) noexcept override;
 
        bool is_locked(void* ptr) const noexcept;
        bool is_backed(void* ptr) const noexcept;
 
    private:
        ice::Allocator& _backing_alloc;
        ice::RingAllocatorParams const _params;
 
        void* _begin;
        void* _end;
 
        void* _allocate;
        void* _free;
    };
 
} // namespace ice