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btree.h
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btree.h
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#ifndef BTREE_H
#define BTREE_H
#include <unistd.h>
#include <stddef.h>
#include <stdint.h>
#include <pthread.h>
#define BTREE_KEY_LEN 128
#define NODE_KEY_POS(NODE, POS) (NODE->keys + (POS) * BTREE_KEY_LEN)
#define NODE_CHLD_POS(NODE, POS) (NODE->chld + (POS))
#define NODE_VAL_POS(NODE, POS) (NODE->vals + (POS))
#define NODE_FULL(DB, NODE) (NODE->h->size == DB->btree_degree)
#define NODE_HALF(DB) floor(DB->btree_degree/2)
typedef ssize_t pageno_t;
enum NodeFlags {
IS_LEAF = 0x01,
IS_TOP = 0x02,
IS_DATA = 0x04,
/* ____RES = 0x08,*/
/* ____RES = 0x10,*/
/* ____RES = 0x20,*/
/* ____RES = 0x40,*/
/* ____RES = 0x80,*/
};
/**
* @brief Structure for working with on-disk page pool
*/
struct PagePool {
int fd;
uint16_t page_size;
size_t pool_size;
pageno_t nPages;
void *bitmask;
struct bit_iterator *it;
struct CacheBase *cache;
pthread_t dumper;
int dumper_enable;
};
struct NodeHeader {
pageno_t page;
uint8_t flags;
uint32_t size;
size_t lsn;
};
struct BTreeNode {
struct NodeHeader *h;
pageno_t *chld;
pageno_t *vals;
char *keys;
};
struct DataNode {
struct NodeHeader *h;
char *data;
};
struct DB {
char *db_name;
struct PagePool *pool;
struct BTreeNode *top;
struct WAL *wal;
size_t lsn;
pageno_t btree_degree;
};
struct DBC {
size_t pool_size;
size_t page_size;
size_t cache_size;
};
/*
void *node_header_init(struct DB *, struct BTreeNode *, void *);
int node_btree_load (struct DB *, struct BTreeNode *, pageno_t);
int node_btree_dump (struct DB *, struct BTreeNode *);
int node_data_load (struct DB *, struct DataNode *, pageno_t);
int node_data_dump (struct DB *, struct DataNode *);
int node_free (struct DB *db, void *node);
int node_deallocate (struct DB *db, pageno_t pos);
*/
#endif /* BTREE_H */