/*
 * Copyright (c) 2026, Chloe M.
 * Provided under the BSD-3 clause.
 *
 * Description:  Object manager cache
 * Author:       Chloe M.
 */

#ifndef _OB_CACHE_H_
#define _OB_CACHE_H_ 1

#include <stdef.h>
#include <ob/object.h>

/*
 * An object cache allows deallocated objects to be recycled without
 * the overhead of true deallocation and reallocation.
 *
 * @First:      First cache entry
 * @Last:       Last cache entry
 * @EntryCount: Number of entires in the cache
 */
typedef struct {
    ST_OBJECT *First;
    ST_OBJECT *Last;
    USIZE EntryCount;
} OBJECT_CACHE;

extern OBJECT_CACHE gObCache;

/*
 * Initialize object cache
 *
 * @Cache: Object cache to initialize
 */
VOID ObInitCache(OBJECT_CACHE *Cache);

/*
 * Reclaim object to cache if the reference count is
 * zero.
 *
 * @Cache:  Cache to reclaim to
 * @Object: Object to reclaim
 */
VOID ObReclaimToCache(OBJECT_CACHE *Cache, ST_OBJECT *Object);

/*
 * Pop an entry for a zeroed object from the cache
 *
 * @Cache:  Cache to pop from
 *
 * Returns an entry on success, otherwise NULL on
 * failure
 */
ST_OBJECT *ObPopFromCache(OBJECT_CACHE *Cache);

#endif  /* !_OB_CACHE_H_ */