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code.delx.au - pulseaudio/blob - src/pulsecore/atomic.h
1 #ifndef foopulseatomichfoo
2 #define foopulseatomichfoo
7 This file is part of PulseAudio.
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.
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.
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
25 #include <atomic_ops.h>
27 /* atomic_ops guarantees us that sizeof(AO_t) == sizeof(void*).
29 * It is not guaranteed however, that sizeof(AO_t) == sizeof(size_t).
30 * however very likely. */
32 typedef struct pa_atomic_int
{
36 /* For now we do only full memory barriers. Eventually we might want
37 * to support more elaborate memory barriers, in which case we will add
38 * suffixes to the function names */
40 static inline int pa_atomic_load(const pa_atomic_int_t
*a
) {
41 return (int) AO_load_full((AO_t
*) &a
->value
);
44 static inline void pa_atomic_store(pa_atomic_int_t
*a
, int i
) {
45 AO_store_full(&a
->value
, (AO_t
) i
);
48 static inline int pa_atomic_add(pa_atomic_int_t
*a
, int i
) {
49 return AO_fetch_and_add_full(&a
->value
, (AO_t
) i
);
52 static inline int pa_atomic_inc(pa_atomic_int_t
*a
) {
53 return AO_fetch_and_add1_full(&a
->value
);
56 static inline int pa_atomic_dec(pa_atomic_int_t
*a
) {
57 return AO_fetch_and_sub1_full(&a
->value
);
60 static inline int pa_atomic_cmpxchg(pa_atomic_int_t
*a
, int old_i
, int new_i
) {
61 return AO_compare_and_swap_full(&a
->value
, old_i
, new_i
);
64 typedef struct pa_atomic_ptr
{
68 static inline void* pa_atomic_ptr_load(const pa_atomic_ptr_t
*a
) {
69 return (void*) AO_load_full((AO_t
*) &a
->value
);
72 static inline void pa_atomic_ptr_store(pa_atomic_ptr_t
*a
, void *p
) {
73 AO_store_full(&a
->value
, (AO_t
) p
);
76 static inline int pa_atomic_ptr_cmpxchg(pa_atomic_ptr_t
*a
, void *old_p
, void* new_p
) {
77 return AO_compare_and_swap_full(&a
->value
, (AO_t
) old_p
, (AO_t
) new_p
);