#include <common/macros.h>
#include <common/trace-chunk.h>
-#ifdef __cplusplus
-extern "C" {
-#endif
-
struct lttng_trace_chunk_registry;
/*
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.
unsigned int lttng_trace_chunk_registry_put_each_chunk(
const struct lttng_trace_chunk_registry *registry);
-#ifdef __cplusplus
-}
-#endif
-
#endif /* LTTNG_TRACE_CHUNK_REGISTRY_H */