handle.c revision e919dee1edd469c174c5c07c95efd4932a674b67 
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
37struct util_hash_table *handle_hash = NULL;
38
39
40static unsigned next_handle = 1;
41
42
43static unsigned
44hash_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
52static int
53compare(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
64void
65init_handles(void)
66{
67   if (!handle_hash)
68      handle_hash = util_hash_table_create(hash_func, compare);
69}
70
71
72void
73free_handles(void)
74{
75   /* XXX destroy */
76}
77
78
79VGHandle
80create_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
88void
89destroy_handle(VGHandle h)
90{
91   util_hash_table_remove(handle_hash, intptr_to_pointer(h));
92}
93
94