src/main/object.h

   1 #ifndef EL__MAIN_OBJECT_H
   2 #define EL__MAIN_OBJECT_H
   3
   4 #include "util/lists.h"
   5
   6 #if 0
   7 #define DEBUG_REFCOUNT
   8 #endif
   9
  10 struct object {
  11         int refcount;
  12 #ifdef CONFIG_DEBUG
  13         unsigned char *name;
  14 #endif
  15 };
  16
  17 #define OBJECT_HEAD(type)                                               \
  18         LIST_HEAD(type);                                                \
  19         struct object object
  20
  21 struct object_head {
  22         OBJECT_HEAD(struct object *);
  23 };
  24
  25 #ifdef DEBUG_REFCOUNT
  26 #include "util/error.h"
  27 #ifdef CONFIG_DEBUG
  28 #define object_lock_debug(obj, info) \
  29         DBG("object %s[%p] lock %s to %d", (obj)->object.name, obj,     \
  30             info, (obj)->object.refcount)
  31 #else
  32 #define object_lock_debug(obj, info) \
  33         DBG("object %p lock %s to %d", obj, info, (obj)->object.refcount)
  34 #endif /* CONFIG_DEBUG */
  35 #else
  36 #define object_lock_debug(obj, info)
  37 #endif /* DEBUG_REFCOUNT */
  38
  39 #ifdef CONFIG_DEBUG
  40 #include "util/error.h"
  41 #define object_sanity_check(obj)                                        \
  42         do {                                                            \
  43                 assert(obj);                                            \
  44                 assertm((obj)->object.refcount >= 0,                    \
  45                         "Object %s[%p] refcount underflow.",            \
  46                         (obj)->object.name, obj);                       \
  47                 if_assert_failed (obj)->object.refcount = 0;            \
  48         } while (0)
  49
  50 #define object_set_name(obj, objname)                                   \
  51         do { (obj)->object.name = (objname); } while (0)
  52 #define INIT_OBJECT(name)       { 0, name }
  53 #else
  54 #define object_sanity_check(obj)
  55 #define object_set_name(obj, name)
  56 #define INIT_OBJECT(name)       { 0 }
  57 #endif /* CONFIG_DEBUG */
  58
  59 #define get_object_refcount(obj) ((obj)->object.refcount)
  60 #define is_object_used(obj) (!!(obj)->object.refcount)
  61
  62 #define object_lock(obj)                                                \
  63         do {                                                            \
  64                 object_sanity_check(obj);                               \
  65                 (obj)->object.refcount++;                               \
  66                 object_lock_debug(obj, "incremented");                  \
  67         } while (0)
  68
  69 #define object_unlock(obj)                                              \
  70         do {                                                            \
  71                 (obj)->object.refcount--;                               \
  72                 object_lock_debug(obj, "decremented");                  \
  73                 object_sanity_check(obj);                               \
  74         } while (0)
  75
  76 /* Please keep this one. It serves for debugging. --Zas */
  77 #define object_nolock(obj, name)                                        \
  78         do {                                                            \
  79                 object_set_name(obj, name);                             \
  80                 object_sanity_check(obj);                               \
  81                 object_lock_debug(obj, "initialized");                  \
  82         } while (0)
  83
  84 #endif