X-Git-Url: http://git.efficios.com/?p=babeltrace.git;a=blobdiff_plain;f=include%2Fbabeltrace%2Fctf%2Fiterator.h;h=fe70b5e732258e5a245e151a7a259eb7eaf237f8;hp=564b6e23f64465afcce5202f2308995aacdc8eba;hb=7f89ddce05f0a5c985d6333fbe70a992da4bd244;hpb=c54983704d35cb1cd6da38cb087df2e3b5cfd5d0

diff --git a/include/babeltrace/ctf/iterator.h b/include/babeltrace/ctf/iterator.h
index 564b6e23..fe70b5e7 100644
--- a/include/babeltrace/ctf/iterator.h
+++ b/include/babeltrace/ctf/iterator.h
@@ -39,10 +39,17 @@ struct bt_ctf_event;
  * By default, if begin_pos is NULL, a BT_SEEK_CUR is performed at
  * creation. By default, if end_pos is NULL, a BT_SEEK_END (end of
  * trace) is the EOF criterion.
+ *
+ * Return a pointer to the newly allocated iterator.
+ *
+ * Only one iterator can be created against a context. If more than one
+ * iterator is being created for the same context, the second creation
+ * will return NULL. The previous iterator must be destroyed before
+ * creation of the new iterator for this function to succeed.
  */
 struct bt_ctf_iter *bt_ctf_iter_create(struct bt_context *ctx,
-		struct bt_iter_pos *begin_pos,
-		struct bt_iter_pos *end_pos);
+		const struct bt_iter_pos *begin_pos,
+		const struct bt_iter_pos *end_pos);
 
 /*
  * bt_ctf_get_iter - get iterator from ctf iterator.
@@ -57,10 +64,9 @@ void bt_ctf_iter_destroy(struct bt_ctf_iter *iter);
 /*
  * bt_ctf_iter_read_event: Read the iterator's current event data.
  *
- * @iter: trace collection iterator (input)
- * @stream: stream containing event at current position (output)
- * @event: current event (output)
- * Return 0 on success, negative error value on error.
+ * @iter: trace collection iterator (input). Should NOT be NULL.
+ *
+ * Return current event on success, NULL on end of trace.
  */
 struct bt_ctf_event *bt_ctf_iter_read_event(struct bt_ctf_iter *iter);