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/*
* KPL memory allocator
*/
typedef enum : int32_t {
KPL_MEMORY_ALLOCATOR_MIN_SIZE_POW2 = 5,
KPL_MEMORY_ALLOCATOR_MIN_ROUND_SIZE_POW2 = KPL_MEMORY_ALLOCATOR_MIN_SIZE_POW2 - 1,
KPL_MEMORY_ALLOCATOR_MAX_SIZE_POW2 = 22,
KPL_MEMORY_ALLOCATOR_SLAB_COUNT = KPL_MEMORY_ALLOCATOR_MAX_SIZE_POW2 + 1
} kpl_memory_allocator_enum;
/*
* Each slab is a linked list allocated with calloc and free
* *buffer is allocated with mmap
*/
typedef struct _kpl_memory_allocator_slab {
uint32_t buffer_size, buffer_used;
struct _kpl_memory_allocator_slab *slab_next;
uint8_t *buffer;
} kpl_memory_allocator_slab;
/*
* Each group only allocates for a single power of two
*/
typedef struct {
int32_t slab_size_pow2;
kpl_memory_allocator_slab *slab_head, *slab_tail;
kpl_object_queue object_pool;
} kpl_memory_allocator_slab_group;
/*
* The allocator allocates object rounded to the next power of two
* We first check if the pool has objects, then bump allocate off the slab *buffer
* Each slab is only responsible for one power of two, all objects in buffer and pool are of the same size
* The memory is allocated from buffer and returned to the pool
* The slabs and buffers are freed and returned to the system at once on allocator free
* The object pools are from each mapped buffer, they do not need to be freed
*/
typedef struct {
kpl_memory_allocator_slab_group slabs[KPL_MEMORY_ALLOCATOR_SLAB_COUNT];
} kpl_memory_allocator;
/*
* Called by owner thread
*/
void kpl_memory_allocator_init(kpl_memory_allocator *memory_allocator);
/*
* Called by owner thread
*/
void kpl_memory_allocator_free(kpl_memory_allocator *memory_allocator);
/*
* Only call this though kpl_thread_object_allocate
* All allocations must extend the KPL_OBJECT_HEADER
*/
void *kpl_memory_allocator_allocate(kpl_memory_allocator *memory_allocator, int32_t size, int32_t thread_id);
/*
* Only call this though kpl_env_object_return
*/
void kpl_memory_allocator_return(kpl_memory_allocator *memory_allocator, void *object);
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