xref: /third_party/mesa3d/src/util/u_hash_table.c (revision bf215546) 
1/**************************************************************************
2 *
3 * Copyright 2008 VMware, Inc.
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
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28
29#include "util/u_pointer.h"
30#include "util/u_hash_table.h"
31
32#if DETECT_OS_UNIX
33#include <sys/stat.h>
34#endif
35
36
37static uint32_t
38pointer_hash(const void *key)
39{
40   return _mesa_hash_pointer(key);
41}
42
43
44static bool
45pointer_equal(const void *a, const void *b)
46{
47   return a == b;
48}
49
50
51struct hash_table *
52util_hash_table_create_ptr_keys(void)
53{
54   return _mesa_hash_table_create(NULL, pointer_hash, pointer_equal);
55}
56
57
58static uint32_t hash_fd(const void *key)
59{
60#if DETECT_OS_UNIX
61   int fd = pointer_to_intptr(key);
62   struct stat stat;
63
64   fstat(fd, &stat);
65
66   return stat.st_dev ^ stat.st_ino ^ stat.st_rdev;
67#else
68   return 0;
69#endif
70}
71
72
73static bool equal_fd(const void *key1, const void *key2)
74{
75#if DETECT_OS_UNIX
76   int fd1 = pointer_to_intptr(key1);
77   int fd2 = pointer_to_intptr(key2);
78   struct stat stat1, stat2;
79
80   fstat(fd1, &stat1);
81   fstat(fd2, &stat2);
82
83   return stat1.st_dev == stat2.st_dev &&
84          stat1.st_ino == stat2.st_ino &&
85          stat1.st_rdev == stat2.st_rdev;
86#else
87   return 0;
88#endif
89}
90
91
92struct hash_table *
93util_hash_table_create_fd_keys(void)
94{
95   return _mesa_hash_table_create(NULL, hash_fd, equal_fd);
96}
97
98
99void *
100util_hash_table_get(struct hash_table *ht,
101                    void *key)
102{
103   struct hash_entry *entry = _mesa_hash_table_search(ht, key);
104
105   return entry ? entry->data : NULL;
106}
107
108
109enum pipe_error
110util_hash_table_foreach(struct hash_table *ht,
111                        enum pipe_error (*callback)
112                        (void *key, void *value, void *data),
113                        void *data)
114{
115   hash_table_foreach(ht, entry) {
116      enum pipe_error error = callback((void*)entry->key, entry->data, data);
117      if (error != PIPE_OK)
118         return error;
119   }
120   return PIPE_OK;
121}
122