X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=libringbuffer%2Fbackend_types.h;h=3432ef078c25071be7ba6dcb216bc0afb44c23ae;hb=09434f96935202d1e6cf64a74d4da4b95d06246d;hp=a53fb322ec109bb2fc5c9cc275e5f0118dd67bf5;hpb=e92f3e285939848f248af08f11a39a04a7fcf852;p=lttng-ust.git

diff --git a/libringbuffer/backend_types.h b/libringbuffer/backend_types.h
index a53fb322..3432ef07 100644
--- a/libringbuffer/backend_types.h
+++ b/libringbuffer/backend_types.h
@@ -24,6 +24,7 @@
  */
 
 #include <limits.h>
+#include <stdint.h>
 #include "shm_internal.h"
 #include "vatomic.h"
 
@@ -42,6 +43,16 @@ struct lttng_ust_lib_ring_buffer_backend_subbuffer {
 	unsigned long id;		/* backend subbuffer identifier */
 };
 
+struct lttng_ust_lib_ring_buffer_backend_counts {
+	/*
+	 * Counter specific to the sub-buffer location within the ring buffer.
+	 * The actual sequence number of the packet within the entire ring
+	 * buffer can be derived from the formula nr_subbuffers * seq_cnt +
+	 * subbuf_idx.
+	 */
+	uint64_t seq_cnt;               /* packet sequence number */
+};
+
 /*
  * Forward declaration of frontend-specific channel and ring_buffer.
  */
@@ -58,6 +69,8 @@ struct lttng_ust_lib_ring_buffer_backend {
 	DECLARE_SHMP(struct lttng_ust_lib_ring_buffer_backend_subbuffer, buf_wsb);
 	/* ring_buffer_backend_subbuffer for reader */
 	struct lttng_ust_lib_ring_buffer_backend_subbuffer buf_rsb;
+	/* Array of lib_ring_buffer_backend_counts for the packet counter */
+	DECLARE_SHMP(struct lttng_ust_lib_ring_buffer_backend_counts, buf_cnt);
 	/*
 	 * Pointer array of backend pages, for whole buffer.
 	 * Indexed by ring_buffer_backend_subbuffer identifier (id) index.