X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=libringbuffer%2Fbackend_types.h;h=f821c27fdd0684695866148da84a6e1fd8599e62;hb=c0c0989ab70574e09b2f7e8b48c2da6af664a849;hp=81e67119847a119b2ad140e71aefa0a648ef5bfa;hpb=2253b139ffb6a4eca7291b60083cc5206a6e128d;p=lttng-ust.git

diff --git a/libringbuffer/backend_types.h b/libringbuffer/backend_types.h
index 81e67119..f821c27f 100644
--- a/libringbuffer/backend_types.h
+++ b/libringbuffer/backend_types.h
@@ -1,17 +1,16 @@
-#ifndef _LINUX_RING_BUFFER_BACKEND_TYPES_H
-#define _LINUX_RING_BUFFER_BACKEND_TYPES_H
-
 /*
- * linux/ringbuffer/backend_types.h
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
- * Copyright (C) 2008-2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2008-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
  * Ring buffer backend (types).
- *
- * Dual LGPL v2.1/GPL v2 license.
  */
 
+#ifndef _LTTNG_RING_BUFFER_BACKEND_TYPES_H
+#define _LTTNG_RING_BUFFER_BACKEND_TYPES_H
+
 #include <limits.h>
+#include <stdint.h>
 #include "shm_internal.h"
 #include "vatomic.h"
 
@@ -30,6 +29,16 @@ 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.
  */
@@ -46,6 +55,8 @@ 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.
@@ -84,4 +95,4 @@ struct channel_backend {
 	struct lttng_ust_lib_ring_buffer_shmp buf[];
 };
 
-#endif /* _LINUX_RING_BUFFER_BACKEND_TYPES_H */
+#endif /* _LTTNG_RING_BUFFER_BACKEND_TYPES_H */