Sessiond rotation thread

[lttng-tools.git] / src / bin / lttng-sessiond / session.h

diff --git a/src/bin/lttng-sessiond/session.h b/src/bin/lttng-sessiond/session.h
index 77f0bf7b1ee87ac4a7b7cd43c731ca0d63701ac4..3b3380c3f4d8f5ec112baedab274969f59765cee 100644 (file)
--- a/src/bin/lttng-sessiond/session.h
+++ b/src/bin/lttng-sessiond/session.h
@@ -22,6 +22,7 @@
 #include <urcu/list.h>
 
 #include <common/hashtable/hashtable.h>
+#include <lttng/rotation.h>
 
 #include "snapshot.h"
 #include "trace-kernel.h"
@@ -117,6 +118,50 @@ struct ltt_session {
         * Node in ltt_sessions_ht_by_id.
         */
        struct lttng_ht_node_u64 node;
+       /* Number of session rotation for this session. */
+       uint64_t rotate_count;
+       /*
+        * Rotation is pending between the time it starts until the consumer has
+        * finished extracting the data. If the session uses a relay, data related
+        * to a rotation can still be in flight after that, see
+        * rotate_pending_relay.
+        */
+       bool rotate_pending;
+       /* Current status of a rotation. */
+       enum lttng_rotation_status rotation_status;
+       /*
+        * Number of channels waiting for a rotation.
+        * When this number reaches 0, we can handle the rename of the chunk
+        * folder and inform the client that the rotate is finished.
+        */
+       unsigned int nr_chan_rotate_pending;
+       struct {
+               /*
+                * When the rotation is in progress, the temporary path name is
+                * stored here. When the rotation is complete, the final path name
+                * is here and can be queried with the rotate_pending call.
+                */
+               char current_rotate_path[LTTNG_PATH_MAX];
+               /*
+                * The path where the consumer is currently writing after the first
+                * session rotation.
+                */
+               char active_tracing_path[LTTNG_PATH_MAX];
+       } rotation_chunk;
+       /*
+        * The timestamp of the beginning of the previous chunk. For the
+        * first chunk, this is the "lttng start" timestamp. For the
+        * subsequent ones, this copies the current_chunk_start_ts value when
+        * a new rotation starts. This value is used to set the name of a
+        * complete chunk directory, ex: "last_chunk_start_ts-now()".
+        */
+       time_t last_chunk_start_ts;
+       /*
+        * This is the timestamp when a new chunk starts. When a new rotation
+        * starts, we copy this value to last_chunk_start_ts and replace it
+        * with the current timestamp.
+        */
+       time_t current_chunk_start_ts;
 };
 
 /* Prototypes */