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

   1 #ifndef foopulseatomichfoo
   2 #define foopulseatomichfoo
   3
   4 /* $Id$ */
   5
   6 /***
   7   This file is part of PulseAudio.
   8
   9   PulseAudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as
  11   published by the Free Software Foundation; either version 2 of the
  12   License, or (at your option) any later version.
  13
  14   PulseAudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public
  20   License along with PulseAudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #include <atomic_ops.h>
  26
  27 /* atomic_ops guarantees us that sizeof(AO_t) == sizeof(void*).
  28  *
  29  * It is not guaranteed however, that sizeof(AO_t) == sizeof(size_t).
  30  * however very likely. */
  31
  32 typedef struct pa_atomic_int {
  33     volatile AO_t value;
  34 } pa_atomic_int_t;
  35
  36 #define PA_ATOMIC_INIT(v) { .value = (v) }
  37
  38 /* For now we do only full memory barriers. Eventually we might want
  39  * to support more elaborate memory barriers, in which case we will add
  40  * suffixes to the function names */
  41
  42 static inline int pa_atomic_load(const pa_atomic_int_t *a) {
  43     return (int) AO_load_full((AO_t*) &a->value);
  44 }
  45
  46 static inline void pa_atomic_store(pa_atomic_int_t *a, int i) {
  47     AO_store_full(&a->value, (AO_t) i);
  48 }
  49
  50 static inline int pa_atomic_add(pa_atomic_int_t *a, int i) {
  51     return AO_fetch_and_add_full(&a->value, (AO_t) i);
  52 }
  53
  54 static inline int pa_atomic_inc(pa_atomic_int_t *a) {
  55     return AO_fetch_and_add1_full(&a->value);
  56 }
  57
  58 static inline int pa_atomic_dec(pa_atomic_int_t *a) {
  59     return AO_fetch_and_sub1_full(&a->value);
  60 }
  61
  62 static inline int pa_atomic_cmpxchg(pa_atomic_int_t *a, int old_i, int new_i) {
  63     return AO_compare_and_swap_full(&a->value, old_i, new_i);
  64 }
  65
  66 typedef struct pa_atomic_ptr {
  67     volatile AO_t value;
  68 } pa_atomic_ptr_t;
  69
  70 static inline void* pa_atomic_ptr_load(const pa_atomic_ptr_t *a) {
  71     return (void*) AO_load_full((AO_t*) &a->value);
  72 }
  73
  74 static inline void pa_atomic_ptr_store(pa_atomic_ptr_t *a, void *p) {
  75     AO_store_full(&a->value, (AO_t) p);
  76 }
  77
  78 static inline int pa_atomic_ptr_cmpxchg(pa_atomic_ptr_t *a, void *old_p, void* new_p) {
  79     return AO_compare_and_swap_full(&a->value, (AO_t) old_p, (AO_t) new_p);
  80 }
  81
  82 #endif