* Dual LGPL v2.1/GPL v2 license.
*/
+#include <assert.h>
+#include <urcu/uatomic.h>
+
/*
* Same data type (long) accessed differently depending on configuration.
* v field is for non-atomic access (protected by mutual exclusion).
* atomic_long_t is used for globally shared buffers.
*/
union v_atomic {
- local_t l;
- atomic_long_t a;
+ long a; /* accessed through uatomic */
long v;
};
static inline
long v_read(const struct lib_ring_buffer_config *config, union v_atomic *v_a)
{
- if (config->sync == RING_BUFFER_SYNC_PER_CPU)
- return local_read(&v_a->l);
- else
- return atomic_long_read(&v_a->a);
+ assert(config->sync != RING_BUFFER_SYNC_PER_CPU);
+ return uatomic_read(&v_a->a);
}
static inline
void v_set(const struct lib_ring_buffer_config *config, union v_atomic *v_a,
long v)
{
- if (config->sync == RING_BUFFER_SYNC_PER_CPU)
- local_set(&v_a->l, v);
- else
- atomic_long_set(&v_a->a, v);
+ assert(config->sync != RING_BUFFER_SYNC_PER_CPU);
+ uatomic_set(&v_a->a, v);
}
static inline
void v_add(const struct lib_ring_buffer_config *config, long v, union v_atomic *v_a)
{
- if (config->sync == RING_BUFFER_SYNC_PER_CPU)
- local_add(v, &v_a->l);
- else
- atomic_long_add(v, &v_a->a);
+ assert(config->sync != RING_BUFFER_SYNC_PER_CPU);
+ uatomic_add(&v_a->a, v);
}
static inline
void v_inc(const struct lib_ring_buffer_config *config, union v_atomic *v_a)
{
- if (config->sync == RING_BUFFER_SYNC_PER_CPU)
- local_inc(&v_a->l);
- else
- atomic_long_inc(&v_a->a);
+ assert(config->sync != RING_BUFFER_SYNC_PER_CPU);
+ uatomic_inc(&v_a->a);
}
/*
long v_cmpxchg(const struct lib_ring_buffer_config *config, union v_atomic *v_a,
long old, long _new)
{
- if (config->sync == RING_BUFFER_SYNC_PER_CPU)
- return local_cmpxchg(&v_a->l, old, _new);
- else
- return atomic_long_cmpxchg(&v_a->a, old, _new);
+ assert(config->sync != RING_BUFFER_SYNC_PER_CPU);
+ return uatomic_cmpxchg(&v_a->a, old, _new);
}
#endif /* _LINUX_RING_BUFFER_VATOMIC_H */