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/*
* Copyright (c) 2007 Intel Corporation. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _OBJECT_HEAP_H_
#define _OBJECT_HEAP_H_
#define OBJECT_HEAP_OFFSET_MASK 0x7F000000
#define OBJECT_HEAP_ID_MASK 0x00FFFFFF
typedef struct object_base *object_base_p;
typedef struct object_heap *object_heap_p;
struct object_base {
int id;
int next_free;
};
struct object_heap {
int object_size;
int id_offset;
void *heap_index;
int next_free;
int heap_size;
int heap_increment;
};
typedef int object_heap_iterator;
/*
* Return 0 on success, -1 on error
*/
int object_heap_init( object_heap_p heap, int object_size, int id_offset);
/*
* Allocates an object
* Returns the object ID on success, returns -1 on error
*/
int object_heap_allocate( object_heap_p heap );
/*
* Lookup an allocated object by object ID
* Returns a pointer to the object on success, returns NULL on error
*/
object_base_p object_heap_lookup( object_heap_p heap, int id );
/*
* Iterate over all objects in the heap.
* Returns a pointer to the first object on the heap, returns NULL if heap is empty.
*/
object_base_p object_heap_first( object_heap_p heap, object_heap_iterator *iter );
/*
* Iterate over all objects in the heap.
* Returns a pointer to the next object on the heap, returns NULL if heap is empty.
*/
object_base_p object_heap_next( object_heap_p heap, object_heap_iterator *iter );
/*
* Frees an object
*/
void object_heap_free( object_heap_p heap, object_base_p obj );
/*
* Destroys a heap, the heap must be empty.
*/
void object_heap_destroy( object_heap_p heap );
#endif /* _OBJECT_HEAP_H_ */
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