*
* Note that a trace chunk registry may only be accessed by an RCU thread.
*/
-LTTNG_HIDDEN
struct lttng_trace_chunk_registry *lttng_trace_chunk_registry_create(void);
/*
* (i.e. all references to the trace chunks it contains must be released) before
* it is destroyed.
*/
-LTTNG_HIDDEN
void lttng_trace_chunk_registry_destroy(
struct lttng_trace_chunk_registry *registry);
*
* Returns an lttng_trace_chunk on success, NULL on error.
*/
-LTTNG_HIDDEN
struct lttng_trace_chunk *lttng_trace_chunk_registry_publish_chunk(
struct lttng_trace_chunk_registry *registry,
uint64_t session_id, struct lttng_trace_chunk *chunk);
+/*
+ * Adds the `previously_published` parameter which allows the caller
+ * to know if a trace chunk equivalent to `chunk` was previously published.
+ *
+ * The registry holds a reference to the published trace chunks it contains.
+ * Trace chunks automatically unpublish themselves from their registry on
+ * destruction.
+ *
+ * This information is necessary to drop the reference of newly published
+ * chunks when a user doesn't wish to explicitly maintain all references
+ * to a given trace chunk.
+ *
+ * For instance, the relay daemon doesn't need the registry to hold a
+ * reference since it controls the lifetime of its trace chunks.
+ * Conversely, the consumer daemons rely on the session daemon to inform
+ * them of the end of life of a trace chunk and the trace chunks don't
+ * belong to a specific top-level object: they are always retrieved from
+ * the registry by `id`.
+ */
+struct lttng_trace_chunk *lttng_trace_chunk_registry_publish_chunk(
+ struct lttng_trace_chunk_registry *registry,
+ uint64_t session_id, struct lttng_trace_chunk *chunk,
+ bool *previously_published);
/*
* Look-up a trace chunk by session_id and chunk_id.
*
* Returns an lttng_trace_chunk on success, NULL if the chunk does not exist.
*/
-LTTNG_HIDDEN
struct lttng_trace_chunk *
lttng_trace_chunk_registry_find_chunk(
const struct lttng_trace_chunk_registry *registry,
*
* Returns 0 on success, a negative value on error.
*/
-LTTNG_HIDDEN
int lttng_trace_chunk_registry_chunk_exists(
const struct lttng_trace_chunk_registry *registry,
uint64_t session_id, uint64_t chunk_id, bool *chunk_exists);
*
* Returns an lttng_trace_chunk on success, NULL if the chunk does not exist.
*/
-LTTNG_HIDDEN
struct lttng_trace_chunk *
lttng_trace_chunk_registry_find_anonymous_chunk(
const struct lttng_trace_chunk_registry *registry,
uint64_t session_id);
-LTTNG_HIDDEN
unsigned int lttng_trace_chunk_registry_put_each_chunk(
const struct lttng_trace_chunk_registry *registry);