#include "p_defines.h"
+#include "p_atomic.h"
#ifdef __cplusplus
struct pipe_reference
{
- unsigned count;
+ struct pipe_atomic count;
};
static INLINE void
pipe_reference_init(struct pipe_reference *reference, unsigned count)
{
- reference->count = count;
+ p_atomic_set(&reference->count, count);
+}
+
+
+static INLINE bool
+pipe_is_referenced(struct pipe_reference *reference)
+{
+ return p_atomic_read(&reference->count) != 0;
}
* Set 'ptr' to point to 'reference' and update reference counting.
* The old thing pointed to, if any, will be unreferenced first.
* 'reference' may be NULL.
- *
- * XXX: thread safety issues!
*/
static INLINE bool
pipe_reference(struct pipe_reference **ptr, struct pipe_reference *reference)
{
bool destroy = FALSE;
- /* bump the reference.count first */
- if (reference) {
- assert(reference->count);
- reference->count++;
- }
-
- if (*ptr) {
- assert((*ptr)->count);
- if (--(*ptr)->count == 0) {
- destroy = TRUE;
+ if(*ptr != reference) {
+ /* bump the reference.count first */
+ if (reference) {
+ assert(pipe_is_referenced(reference));
+ p_atomic_inc(&reference->count);
}
+
+ if (*ptr) {
+ assert(pipe_is_referenced(*ptr));
+ if (p_atomic_dec_zero(&(*ptr)->count)) {
+ destroy = TRUE;
+ }
+ }
+
+ *ptr = reference;
}
- *ptr = reference;
-
return destroy;
}
+#ifdef __cplusplus
+}
+#endif
+
#endif /* P_REFCNT_H */