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  1. /*
  2.  * Copyright (c) 2007 Intel Corporation. All Rights Reserved.
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the
  6.  * "Software"), to deal in the Software without restriction, including
  7.  * without limitation the rights to use, copy, modify, merge, publish,
  8.  * distribute, sub license, and/or sell copies of the Software, and to
  9.  * permit persons to whom the Software is furnished to do so, subject to
  10.  * the following conditions:
  11.  *
  12.  * The above copyright notice and this permission notice (including the
  13.  * next paragraph) shall be included in all copies or substantial portions
  14.  * of the Software.
  15.  *
  16.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  19.  * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
  20.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  21.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  22.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23.  */
  24.  
  25. #ifndef _OBJECT_HEAP_H_
  26. #define _OBJECT_HEAP_H_
  27.  
  28. #include "i965_mutext.h"
  29.  
  30. #define OBJECT_HEAP_OFFSET_MASK         0x7F000000
  31. #define OBJECT_HEAP_ID_MASK                     0x00FFFFFF
  32.  
  33. typedef struct object_base *object_base_p;
  34. typedef struct object_heap *object_heap_p;
  35.  
  36. struct object_base {
  37.     int id;
  38.     int next_free;
  39. };
  40.  
  41. struct object_heap {
  42.     int object_size;
  43.     int id_offset;
  44.     int next_free;
  45.     int heap_size;
  46.     int heap_increment;
  47.     _I965Mutex mutex;
  48.     void **bucket;
  49.     int num_buckets;
  50. };
  51.  
  52. typedef int object_heap_iterator;
  53.  
  54. /*
  55.  * Return 0 on success, -1 on error
  56.  */
  57. int object_heap_init( object_heap_p heap, int object_size, int id_offset);
  58.  
  59. /*
  60.  * Allocates an object
  61.  * Returns the object ID on success, returns -1 on error
  62.  */
  63. int object_heap_allocate( object_heap_p heap );
  64.  
  65. /*
  66.  * Lookup an allocated object by object ID
  67.  * Returns a pointer to the object on success, returns NULL on error
  68.  */
  69. object_base_p object_heap_lookup( object_heap_p heap, int id );
  70.  
  71. /*
  72.  * Iterate over all objects in the heap.
  73.  * Returns a pointer to the first object on the heap, returns NULL if heap is empty.
  74.  */
  75. object_base_p object_heap_first( object_heap_p heap, object_heap_iterator *iter );
  76.  
  77. /*
  78.  * Iterate over all objects in the heap.
  79.  * Returns a pointer to the next object on the heap, returns NULL if heap is empty.
  80.  */
  81. object_base_p object_heap_next( object_heap_p heap, object_heap_iterator *iter );
  82.  
  83. /*
  84.  * Frees an object
  85.  */
  86. void object_heap_free( object_heap_p heap, object_base_p obj );
  87.  
  88. /*
  89.  * Destroys a heap, the heap must be empty.
  90.  */
  91. void object_heap_destroy( object_heap_p heap );
  92.  
  93. #endif /* _OBJECT_HEAP_H_ */
  94.