src/gallium/auxiliary/util/u_hash_table.c

   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 "pipe/p_compiler.h"
  30 #include "util/u_debug.h"
  31
  32 #include "util/u_memory.h"
  33 #include "util/u_hash_table.h"
  34 #include "util/hash_table.h"
  35
  36 #if DETECT_OS_UNIX
  37 #include <sys/stat.h>
  38 #endif
  39
  40
  41 struct hash_table *
  42 util_hash_table_create(uint32_t (*hash)(const void *key),
  43                        bool (*equal)(const void *key1, const void *key2))
  44 {
  45    return _mesa_hash_table_create(NULL, hash, equal);
  46 }
  47
  48
  49 static uint32_t
  50 pointer_hash(const void *key)
  51 {
  52    return _mesa_hash_pointer(key);
  53 }
  54
  55
  56 static bool
  57 pointer_equal(const void *a, const void *b)
  58 {
  59    return a == b;
  60 }
  61
  62
  63 struct hash_table *
  64 util_hash_table_create_ptr_keys(void)
  65 {
  66    return _mesa_hash_table_create(NULL, pointer_hash, pointer_equal);
  67 }
  68
  69
  70 static uint32_t hash_fd(const void *key)
  71 {
  72 #if DETECT_OS_UNIX
  73    int fd = pointer_to_intptr(key);
  74    struct stat stat;
  75
  76    fstat(fd, &stat);
  77
  78    return stat.st_dev ^ stat.st_ino ^ stat.st_rdev;
  79 #else
  80    return 0;
  81 #endif
  82 }
  83
  84
  85 static bool equal_fd(const void *key1, const void *key2)
  86 {
  87 #if DETECT_OS_UNIX
  88    int fd1 = pointer_to_intptr(key1);
  89    int fd2 = pointer_to_intptr(key2);
  90    struct stat stat1, stat2;
  91
  92    fstat(fd1, &stat1);
  93    fstat(fd2, &stat2);
  94
  95    return stat1.st_dev == stat2.st_dev &&
  96           stat1.st_ino == stat2.st_ino &&
  97           stat1.st_rdev == stat2.st_rdev;
  98 #else
  99    return 0;
 100 #endif
 101 }
 102
 103
 104 struct hash_table *
 105 util_hash_table_create_fd_keys(void)
 106 {
 107    return _mesa_hash_table_create(NULL, hash_fd, equal_fd);
 108 }
 109
 110
 111 enum pipe_error
 112 util_hash_table_set(struct hash_table *ht,
 113                     void *key,
 114                     void *value)
 115 {
 116    _mesa_hash_table_insert(ht, key, value);
 117    return PIPE_OK;
 118 }
 119
 120
 121 void *
 122 util_hash_table_get(struct hash_table *ht,
 123                     void *key)
 124 {
 125    struct hash_entry *entry = _mesa_hash_table_search(ht, key);
 126
 127    return entry ? entry->data : NULL;
 128 }
 129
 130
 131 void
 132 util_hash_table_remove(struct hash_table *ht,
 133                        void *key)
 134 {
 135    _mesa_hash_table_remove_key(ht, key);
 136 }
 137
 138
 139 void
 140 util_hash_table_clear(struct hash_table *ht)
 141 {
 142    _mesa_hash_table_clear(ht, NULL);
 143 }
 144
 145
 146 enum pipe_error
 147 util_hash_table_foreach(struct hash_table *ht,
 148                         enum pipe_error (*callback)
 149                         (void *key, void *value, void *data),
 150                         void *data)
 151 {
 152    hash_table_foreach(ht, entry) {
 153       enum pipe_error error = callback((void*)entry->key, entry->data, data);
 154       if (error != PIPE_OK)
 155          return error;
 156    }
 157    return PIPE_OK;
 158 }
 159
 160
 161 size_t
 162 util_hash_table_count(struct hash_table *ht)
 163 {
 164    return _mesa_hash_table_num_entries(ht);
 165 }
 166
 167
 168 void
 169 util_hash_table_destroy(struct hash_table *ht)
 170 {
 171    _mesa_hash_table_destroy(ht, NULL);
 172 }