X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Ftrace-chunk-registry.h;h=5442d7997893eb744121d7661706d677fcbae127;hb=67ce756361aa64f41deac3705e0dd861f7e89a02;hp=f61e560808486c37b1640d3ed04bce0a6cf48555;hpb=ac497a37018f3c253d2e50397294f58d33f7f24f;p=lttng-tools.git

diff --git a/src/common/trace-chunk-registry.h b/src/common/trace-chunk-registry.h
index f61e56080..5442d7997 100644
--- a/src/common/trace-chunk-registry.h
+++ b/src/common/trace-chunk-registry.h
@@ -14,10 +14,6 @@
 #include <common/macros.h>
 #include <common/trace-chunk.h>
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 struct lttng_trace_chunk_registry;
 
 /*
@@ -61,6 +57,29 @@ void lttng_trace_chunk_registry_destroy(
 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.
@@ -96,8 +115,4 @@ lttng_trace_chunk_registry_find_anonymous_chunk(
 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 */