83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
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#ifndef MT_SHADOW_H
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#define MT_SHADOW_H
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#include <librr/types.h>
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#include <shadow-tag.h>
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typedef struct MtShadowRegistry MtShadowRegistry;
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typedef struct MtShadow MtShadow;
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typedef struct MtShadowPool MtShadowPool;
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typedef struct MtShadowLookupTree MtShadowLookupTree;
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/// @brief: An MtShadow contains the actual information which is used
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/// each time when an entity is modified. It contains the tags and
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/// other meta-information as well as data required for optimization.
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struct MtShadow
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{
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void *context;
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MtShadowTag *tag_chain_start;
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u32_t identifier;
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MtShadowPool *pool;
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MtShadow *pool_next;
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};
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struct MtShadowPool
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{
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usz_t capacity;
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MtShadow *shadows;
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MtShadow *first_free;
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MtShadowPool *continuation;
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};
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typedef struct MtShadowLookupLevel3
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{
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MtShadow *next[256];
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} MtShadowLookupLevel3;
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typedef struct MtShadowLookupLevel2
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{
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MtShadowLookupLevel3 *next[256];
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} MtShadowLookupLevel2;
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typedef struct MtShadowLookup1
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{
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MtShadowLookupLevel2 *next[256];
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} MtShadowLookupLevel1;
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struct MtShadowLookupTree
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{
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MtShadowLookupLevel1 *next[256];
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};
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struct MtShadowRegistry
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{
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// TODO: The IDs must be assigned using a singly linked list of indices
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// to the next free entry, the index representing the ID's value and having
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// stored the next free entry's index. Conceptually similar to the internals
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// of the old File Allocation Table filesystems (FAT12, FAT16, FAT32).
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u32_t id_counter;
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MtShadowPool root_pool;
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MtShadowLookupTree lookup_tree;
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void *context_ptr;
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};
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MtShadowRegistry mt_create_shadow_registry(void *context_ptr);
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void mt_cleanup_shadow_registry(MtShadowRegistry *registry);
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MtShadow * mt_create_shadow(MtShadowRegistry *registry);
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MtShadow * mt_lookup_shadow(MtShadowRegistry *registry, u32_t identifier);
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void mt_delete_shadow(MtShadowRegistry *registry, MtShadow *shadow);
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void mt_cleanup_shadow_pool(MtShadowPool *pool);
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void mt_free_shadow_pool(MtShadowPool *pool);
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MtShadowLookupTree mt_create_shadow_lookup_tree();
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void mt_init_shadow_pool(MtShadowPool *pool, usz_t capacity);
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MtShadowPool * mt_new_shadow_pool(usz_t capacity);
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MtShadow * mt_pool_shadow(MtShadowPool *pool);
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void mt_unpool_shadow(MtShadow *shadow);
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#endif // MT_SHADOW_H
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