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-rw-r--r--src/pulsecore/atomic.h80
1 files changed, 80 insertions, 0 deletions
diff --git a/src/pulsecore/atomic.h b/src/pulsecore/atomic.h
new file mode 100644
index 00000000..f789142d
--- /dev/null
+++ b/src/pulsecore/atomic.h
@@ -0,0 +1,80 @@
+#ifndef foopulseatomichfoo
+#define foopulseatomichfoo
+
+/* $Id$ */
+
+/***
+ This file is part of PulseAudio.
+
+ PulseAudio is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ PulseAudio is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with PulseAudio; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
+***/
+
+#include <atomic_ops.h>
+
+/* atomic_ops guarantees us that sizeof(AO_t) == sizeof(void*).
+ *
+ * It is not guaranteed however, that sizeof(AO_t) == sizeof(size_t).
+ * however very likely. */
+
+typedef struct pa_atomic_int {
+ volatile AO_t value;
+} pa_atomic_int_t;
+
+/* For now we do only full memory barriers. Eventually we might want
+ * to support more elaborate memory barriers, in which case we will add
+ * suffixes to the function names */
+
+static inline int pa_atomic_load(const pa_atomic_int_t *a) {
+ return (int) AO_load_full((AO_t*) &a->value);
+}
+
+static inline void pa_atomic_store(pa_atomic_int_t *a, int i) {
+ AO_store_full(&a->value, (AO_t) i);
+}
+
+static inline int pa_atomic_add(pa_atomic_int_t *a, int i) {
+ return AO_fetch_and_add_full(&a->value, (AO_t) i);
+}
+
+static inline int pa_atomic_inc(pa_atomic_int_t *a) {
+ return AO_fetch_and_add1_full(&a->value);
+}
+
+static inline int pa_atomic_dec(pa_atomic_int_t *a) {
+ return AO_fetch_and_sub1_full(&a->value);
+}
+
+static inline int pa_atomic_cmpxchg(pa_atomic_int_t *a, int old_i, int new_i) {
+ return AO_compare_and_swap_full(&a->value, old_i, new_i);
+}
+
+typedef struct pa_atomic_ptr {
+ volatile AO_t value;
+} pa_atomic_ptr_t;
+
+static inline void* pa_atomic_ptr_load(const pa_atomic_ptr_t *a) {
+ return (void*) AO_load_full((AO_t*) &a->value);
+}
+
+static inline void pa_atomic_ptr_store(pa_atomic_ptr_t *a, void *p) {
+ AO_store_full(&a->value, (AO_t) p);
+}
+
+static inline int pa_atomic_ptr_cmpxchg(pa_atomic_ptr_t *a, void *old_p, void* new_p) {
+ return AO_compare_and_swap_full(&a->value, (AO_t) old_p, (AO_t) new_p);
+}
+
+#endif