code.delx.au - pulseaudio/blob - src/pulsecore/object.h

   1 #ifndef foopulseobjecthfoo
   2 #define foopulseobjecthfoo
   3
   4 /***
   5   This file is part of PulseAudio.
   6
   7   Copyright 2004-2006 Lennart Poettering
   8   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   9
  10   PulseAudio is free software; you can redistribute it and/or modify
  11   it under the terms of the GNU Lesser General Public License as published
  12   by the Free Software Foundation; either version 2 of the License,
  13   or (at your option) any later version.
  14
  15   PulseAudio is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with PulseAudio; if not, write to the Free Software
  22   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  23   USA.
  24 ***/
  25
  26 #include <string.h>
  27 #include <sys/types.h>
  28
  29 #include <pulse/xmalloc.h>
  30 #include <pulsecore/refcnt.h>
  31 #include <pulsecore/macro.h>
  32
  33 typedef struct pa_object pa_object;
  34
  35 struct pa_object {
  36     PA_REFCNT_DECLARE;
  37     const char *type_name;
  38     void (*free)(pa_object *o);
  39     int (*check_type)(const char *type_name);
  40 };
  41
  42 pa_object *pa_object_new_internal(size_t size, const char *type_name, int (*check_type)(const char *type_name));
  43 #define pa_object_new(type) ((type*) pa_object_new_internal(sizeof(type), #type, type##_check_type)
  44
  45 #define pa_object_free ((void (*) (pa_object* _obj)) pa_xfree)
  46
  47 int pa_object_check_type(const char *type);
  48
  49 static inline int pa_object_isinstance(void *o) {
  50     pa_object *obj = (pa_object*) o;
  51     return obj ? obj->check_type("pa_object") : 0;
  52 }
  53
  54 pa_object *pa_object_ref(pa_object *o);
  55 void pa_object_unref(pa_object *o);
  56
  57 static inline int pa_object_refcnt(pa_object *o) {
  58     return o ? PA_REFCNT_VALUE(o) : 0;
  59 }
  60
  61 static inline pa_object* pa_object_cast(void *o) {
  62     pa_object *obj = (pa_object*) o;
  63     pa_assert(!obj || obj->check_type("pa_object"));
  64     return obj;
  65 }
  66
  67 #define pa_object_assert_ref(o) pa_assert(pa_object_refcnt(o) > 0)
  68
  69 #define PA_OBJECT(o) pa_object_cast(o)
  70
  71 #define PA_DECLARE_CLASS(c)                                             \
  72     static inline int c##_isinstance(void *o) {                         \
  73         pa_object *obj = (pa_object*) o;                                \
  74         return obj ? obj->check_type(#c) : 1;                           \
  75     }                                                                   \
  76     static inline c* c##_cast(void *o) {                                \
  77         pa_assert(c##_isinstance(o));                                   \
  78         return (c*) o;                                                  \
  79     }                                                                   \
  80     static inline c* c##_ref(c *o) {                                    \
  81         return (c*) pa_object_ref(PA_OBJECT(o));                        \
  82     }                                                                   \
  83     static inline void c##_unref(c* o) {                                \
  84         pa_object_unref(PA_OBJECT(o));                                  \
  85     }                                                                   \
  86     static inline int c##_refcnt(c* o) {                                \
  87         return pa_object_refcnt(PA_OBJECT(o));                          \
  88     }                                                                   \
  89     static inline void c##_assert_ref(c *o) {                           \
  90         pa_object_assert_ref(PA_OBJECT(o));                             \
  91     }                                                                   \
  92     struct __stupid_useless_struct_to_allow_trailing_semicolon
  93
  94 #define PA_DEFINE_CHECK_TYPE(c, parent)                                 \
  95     int c##_check_type(const char *type) {                              \
  96         pa_assert(type);                                                \
  97         if (strcmp(type, #c) == 0)                                      \
  98             return 1;                                                   \
  99         return parent##_check_type(type);                               \
 100     }                                                                   \
 101     struct __stupid_useless_struct_to_allow_trailing_semicolon
 102
 103
 104 #endif