workbench/libs/mesa/src/gallium/auxiliary/util/u_handle_table.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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  27
  28 /**
  29  * @file
  30  * Generic handle table.
  31  *
  32  * @author José Fonseca <jrfonseca@tungstengraphics.com>
  33  */
  34
  35 #ifndef U_HANDLE_TABLE_H_
  36 #define U_HANDLE_TABLE_H_
  37
  38
  39 #ifdef __cplusplus
  40 extern "C" {
  41 #endif
  42
  43
  44 /**
  45  * Abstract data type to map integer handles to objects.
  46  *
  47  * Also referred as "pointer array".
  48  */
  49 struct handle_table;
  50
  51
  52 struct handle_table *
  53 handle_table_create(void);
  54
  55
  56 /**
  57  * Set an optional destructor callback.
  58  *
  59  * If set, it will be called during handle_table_remove and
  60  * handle_table_destroy calls.
  61  */
  62 void
  63 handle_table_set_destroy(struct handle_table *ht,
  64                          void (*destroy)(void *object));
  65
  66
  67 /**
  68  * Add a new object.
  69  *
  70  * Returns a zero handle on failure (out of memory).
  71  */
  72 unsigned
  73 handle_table_add(struct handle_table *ht,
  74                  void *object);
  75
  76 /**
  77  * Returns zero on failure (out of memory).
  78  */
  79 unsigned
  80 handle_table_set(struct handle_table *ht,
  81                  unsigned handle,
  82                  void *object);
  83
  84 /**
  85  * Fetch an existing object.
  86  *
  87  * Returns NULL for an invalid handle.
  88  */
  89 void *
  90 handle_table_get(struct handle_table *ht,
  91                  unsigned handle);
  92
  93
  94 void
  95 handle_table_remove(struct handle_table *ht,
  96                     unsigned handle);
  97
  98
  99 void
 100 handle_table_destroy(struct handle_table *ht);
 101
 102
 103 unsigned
 104 handle_table_get_first_handle(struct handle_table *ht);
 105
 106
 107 unsigned
 108 handle_table_get_next_handle(struct handle_table *ht,
 109                              unsigned handle);
 110
 111
 112 #ifdef __cplusplus
 113 }
 114 #endif
 115
 116 #endif /* U_HANDLE_TABLE_H_ */