src/mesa/drivers/dri/i965/libdrm_lists.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 Tungsten Graphics, Inc., Bismarck, 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 SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  18  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  19  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  */
  26
  27 /*
  28  * List macros heavily inspired by the Linux kernel
  29  * list handling. No list looping yet.
  30  */
  31
  32 #include <stddef.h>
  33
  34 #ifndef typeof
  35 #define typeof __typeof__
  36 #endif
  37
  38 typedef struct _drmMMListHead
  39 {
  40     struct _drmMMListHead *prev;
  41     struct _drmMMListHead *next;
  42 } drmMMListHead;
  43
  44 #define DRMINITLISTHEAD(__item)                \
  45   do{                                          \
  46     (__item)->prev = (__item);                 \
  47     (__item)->next = (__item);                 \
  48   } while (0)
  49
  50 #define DRMLISTADD(__item, __list)              \
  51   do {                                          \
  52     (__item)->prev = (__list);                  \
  53     (__item)->next = (__list)->next;            \
  54     (__list)->next->prev = (__item);            \
  55     (__list)->next = (__item);                  \
  56   } while (0)
  57
  58 #define DRMLISTADDTAIL(__item, __list)          \
  59   do {                                          \
  60     (__item)->next = (__list);                  \
  61     (__item)->prev = (__list)->prev;            \
  62     (__list)->prev->next = (__item);            \
  63     (__list)->prev = (__item);                  \
  64   } while(0)
  65
  66 #define DRMLISTDEL(__item)                      \
  67   do {                                          \
  68     (__item)->prev->next = (__item)->next;      \
  69     (__item)->next->prev = (__item)->prev;      \
  70   } while(0)
  71
  72 #define DRMLISTDELINIT(__item)                  \
  73   do {                                          \
  74     (__item)->prev->next = (__item)->next;      \
  75     (__item)->next->prev = (__item)->prev;      \
  76     (__item)->next = (__item);                  \
  77     (__item)->prev = (__item);                  \
  78   } while(0)
  79
  80 #define DRMLISTENTRY(__type, __item, __field)   \
  81     ((__type *)(((char *) (__item)) - offsetof(__type, __field)))
  82
  83 #define DRMLISTEMPTY(__item) ((__item)->next == (__item))
  84
  85 #define DRMLISTSINGLE(__list) \
  86         (!DRMLISTEMPTY(__list) && ((__list)->next == (__list)->prev))
  87
  88 #define DRMLISTFOREACH(__item, __list)                                  \
  89         for ((__item) = (__list)->next;                                 \
  90              (__item) != (__list); (__item) = (__item)->next)
  91
  92 #define DRMLISTFOREACHSAFE(__item, __temp, __list)                      \
  93         for ((__item) = (__list)->next, (__temp) = (__item)->next;      \
  94              (__item) != (__list);                                      \
  95              (__item) = (__temp), (__temp) = (__item)->next)
  96
  97 #define DRMLISTFOREACHSAFEREVERSE(__item, __temp, __list)               \
  98         for ((__item) = (__list)->prev, (__temp) = (__item)->prev;      \
  99              (__item) != (__list);                                      \
 100              (__item) = (__temp), (__temp) = (__item)->prev)
 101
 102 #define DRMLISTFOREACHENTRY(__item, __list, __head)                            \
 103         for ((__item) = DRMLISTENTRY(typeof(*__item), (__list)->next, __head); \
 104              &(__item)->__head != (__list);                                    \
 105              (__item) = DRMLISTENTRY(typeof(*__item),                          \
 106                                      (__item)->__head.next, __head))
 107
 108 #define DRMLISTFOREACHENTRYSAFE(__item, __temp, __list, __head)                \
 109         for ((__item) = DRMLISTENTRY(typeof(*__item), (__list)->next, __head), \
 110              (__temp) = DRMLISTENTRY(typeof(*__item),                          \
 111                                      (__item)->__head.next, __head);           \
 112              &(__item)->__head != (__list);                                    \
 113              (__item) = (__temp),                                              \
 114              (__temp) = DRMLISTENTRY(typeof(*__item),                          \
 115                                      (__temp)->__head.next, __head))
 116
 117 #define DRMLISTJOIN(__list, __join) if (!DRMLISTEMPTY(__list)) {        \
 118         (__list)->next->prev = (__join);                                \
 119         (__list)->prev->next = (__join)->next;                          \
 120         (__join)->next->prev = (__list)->prev;                          \
 121         (__join)->next = (__list)->next;                                \
 122 }