Subversion Repositories Kolibri OS

Rev

Rev 3192 | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  1. /**************************************************************************
  2.  *
  3.  * Copyright 2006 Tungsten Graphics, Inc., Bismack, ND. USA.
  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
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  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 OR
  19.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20.  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21.  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22.  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23.  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24.  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  *
  27.  **************************************************************************/
  28. /*
  29.  * Simple open hash tab implementation.
  30.  *
  31.  * Authors:
  32.  * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
  33.  */
  34.  
  35. #ifndef DRM_HASHTAB_H
  36. #define DRM_HASHTAB_H
  37.  
  38. #include <linux/list.h>
  39.  
  40. #define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)
  41.  
  42. struct drm_hash_item {
  43.         struct hlist_node head;
  44.         unsigned long key;
  45. };
  46.  
  47. struct drm_open_hash {
  48.         struct hlist_head *table;
  49.         u8 order;
  50. };
  51.  
  52. extern int drm_ht_create(struct drm_open_hash *ht, unsigned int order);
  53. extern int drm_ht_insert_item(struct drm_open_hash *ht, struct drm_hash_item *item);
  54. extern int drm_ht_just_insert_please(struct drm_open_hash *ht, struct drm_hash_item *item,
  55.                                      unsigned long seed, int bits, int shift,
  56.                                      unsigned long add);
  57. extern int drm_ht_find_item(struct drm_open_hash *ht, unsigned long key, struct drm_hash_item **item);
  58.  
  59. extern void drm_ht_verbose_list(struct drm_open_hash *ht, unsigned long key);
  60. extern int drm_ht_remove_key(struct drm_open_hash *ht, unsigned long key);
  61. extern int drm_ht_remove_item(struct drm_open_hash *ht, struct drm_hash_item *item);
  62. extern void drm_ht_remove(struct drm_open_hash *ht);
  63.  
  64. /*
  65.  * RCU-safe interface
  66.  *
  67.  * The user of this API needs to make sure that two or more instances of the
  68.  * hash table manipulation functions are never run simultaneously.
  69.  * The lookup function drm_ht_find_item_rcu may, however, run simultaneously
  70.  * with any of the manipulation functions as long as it's called from within
  71.  * an RCU read-locked section.
  72.  */
  73. #define drm_ht_insert_item_rcu drm_ht_insert_item
  74. #define drm_ht_just_insert_please_rcu drm_ht_just_insert_please
  75. #define drm_ht_remove_key_rcu drm_ht_remove_key
  76. #define drm_ht_remove_item_rcu drm_ht_remove_item
  77. #define drm_ht_find_item_rcu drm_ht_find_item
  78.  
  79. #endif
  80.