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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2010 VMware, Inc.  All Rights Reserved.
  4.  *
  5.  * Permission is hereby granted, free of charge, to any person obtaining a
  6.  * copy of this software and associated documentation files (the
  7.  * "Software"), to deal in the Software without restriction, including
  8.  * without limitation the rights to use, copy, modify, merge, publish,
  9.  * distribute, sub license, and/or sell copies of the Software, and to
  10.  * permit persons to whom the Software is furnished to do so, subject to
  11.  * the following conditions:
  12.  *
  13.  * The above copyright notice and this permission notice (including the
  14.  * next paragraph) shall be included in all copies or substantial portions
  15.  * of the Software.
  16.  *
  17.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  20.  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  21.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24.  *
  25.  **************************************************************************/
  26.  
  27.  
  28. #include "handle.h"
  29. #include "util/u_hash.h"
  30. #include "util/u_hash_table.h"
  31.  
  32.  
  33. /**
  34.  * Hash keys are 32-bit VGHandles
  35.  */
  36.  
  37. struct util_hash_table *handle_hash = NULL;
  38.  
  39.  
  40. static unsigned next_handle = 1;
  41.  
  42.  
  43. static unsigned
  44. hash_func(void *key)
  45. {
  46.    /* XXX this kind of ugly */
  47.    intptr_t ip = pointer_to_intptr(key);
  48.    return (unsigned) (ip & 0xffffffff);
  49. }
  50.  
  51.  
  52. static int
  53. compare(void *key1, void *key2)
  54. {
  55.    if (key1 < key2)
  56.       return -1;
  57.    else if (key1 > key2)
  58.       return +1;
  59.    else
  60.       return 0;
  61. }
  62.  
  63.  
  64. void
  65. init_handles(void)
  66. {
  67.    if (!handle_hash)
  68.       handle_hash = util_hash_table_create(hash_func, compare);
  69. }
  70.  
  71.  
  72. void
  73. free_handles(void)
  74. {
  75.    /* XXX destroy */
  76. }
  77.  
  78.  
  79. VGHandle
  80. create_handle(void *object)
  81. {
  82.    VGHandle h = next_handle++;
  83.    util_hash_table_set(handle_hash, intptr_to_pointer(h), object);
  84.    return h;
  85. }
  86.  
  87.  
  88. void
  89. destroy_handle(VGHandle h)
  90. {
  91.    util_hash_table_remove(handle_hash, intptr_to_pointer(h));
  92. }
  93.  
  94.