X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=include%2Flttng%2Fust-events.h;h=95b4698de089bb08440687bbcb226f7ca461bcd2;hb=b4c54822d66aaf7bc10fe27cb8bfd8622b370d6b;hp=ceb9cb379c533c792d3f5c9edbda698cf6138065;hpb=4e48b5d2debaf6c0c598489c183cc6cb2125c8a3;p=lttng-ust.git

diff --git a/include/lttng/ust-events.h b/include/lttng/ust-events.h
index ceb9cb37..95b4698d 100644
--- a/include/lttng/ust-events.h
+++ b/include/lttng/ust-events.h
@@ -174,12 +174,19 @@ struct lttng_ust_type_enum {
 	const struct lttng_ust_type_common *container_type;
 };
 
+/*
+ * The alignment field in structure, array, and sequence types is a
+ * minimum alignment requirement. The actual alignment of a type may be
+ * larger than this explicit alignment value if its nested types have a
+ * larger alignment.
+ */
+
 struct lttng_ust_type_array {
 	struct lttng_ust_type_common parent;
 	uint32_t struct_size;
 	const struct lttng_ust_type_common *elem_type;
-	unsigned int length;			/* Num. elems. */
-	unsigned int alignment;
+	unsigned int length;		/* Num. elems. */
+	unsigned int alignment;		/* Minimum alignment for this type. */
 	enum lttng_ust_string_encoding encoding;
 };
 
@@ -188,7 +195,7 @@ struct lttng_ust_type_sequence {
 	uint32_t struct_size;
 	const char *length_name;	/* Length field name. */
 	const struct lttng_ust_type_common *elem_type;
-	unsigned int alignment;		/* Alignment before elements. */
+	unsigned int alignment;		/* Minimum alignment before elements. */
 	enum lttng_ust_string_encoding encoding;
 };
 
@@ -197,7 +204,7 @@ struct lttng_ust_type_struct {
 	uint32_t struct_size;
 	unsigned int nr_fields;
 	const struct lttng_ust_event_field **fields;	/* Array of pointers to fields. */
-	unsigned int alignment;
+	unsigned int alignment;		/* Minimum alignment for this type. */
 };
 
 /*
@@ -342,7 +349,7 @@ struct lttng_ust_event_common {
 
 	int enabled;
 	int eval_filter;				/* Need to evaluate filters */
-	int (*run_filter)(struct lttng_ust_event_common *event,
+	int (*run_filter)(const struct lttng_ust_event_common *event,
 		const char *stack_data,
 		void *filter_ctx);
 
@@ -415,7 +422,7 @@ struct lttng_ust_event_notifier {
 	struct lttng_ust_event_notifier_private *priv;	/* Private event notifier interface */
 
 	int eval_capture;				/* Need to evaluate capture */
-	void (*notification_send)(struct lttng_ust_event_notifier *event_notifier,
+	void (*notification_send)(const struct lttng_ust_event_notifier *event_notifier,
 		const char *stack_data,
 		struct lttng_ust_notification_ctx *notif_ctx);