ir: add bt_ctf_clock_class object, modify bt_ctf_clock object

[babeltrace.git] / include / babeltrace / ctf-writer / stream-class.h

diff --git a/include/babeltrace/ctf-writer/stream-class.h b/include/babeltrace/ctf-writer/stream-class.h
index 2f6c8bdbba55a560012b90d7a72c5a12fdc2731c..099739067cd3f42303bd61e70362be64d4bf4c65 100644 (file)
--- a/include/babeltrace/ctf-writer/stream-class.h
+++ b/include/babeltrace/ctf-writer/stream-class.h
@@ -1,3 +1,6 @@
+#ifndef BABELTRACE_CTF_WRITER_STREAM_CLASS_H
+#define BABELTRACE_CTF_WRITER_STREAM_CLASS_H
+
 /*
  * BabelTrace - CTF Writer: Stream Class
  *
@@ -28,3 +31,50 @@
  */
 
 #include <babeltrace/ctf-ir/stream-class.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * bt_ctf_stream_class_set_clock: assign a clock to a stream class.
+ *
+ * Assign a clock to a stream class. This clock will be sampled each time an
+ * event is appended to an instance of this stream class.
+ *
+ * @param stream_class Stream class.
+ * @param clock Clock to assign to the provided stream class.
+ *
+ * Returns 0 on success, a negative value on error.
+ */
+extern int bt_ctf_stream_class_set_clock(
+               struct bt_ctf_stream_class *stream_class,
+               struct bt_ctf_clock *clock);
+
+extern struct bt_ctf_clock *bt_ctf_stream_class_get_clock(
+        struct bt_ctf_stream_class *stream_class);
+
+/*
+ * bt_ctf_stream_class_get and bt_ctf_stream_class_put: increment and
+ * decrement the stream class' reference count.
+ *
+ * You may also use bt_ctf_get() and bt_ctf_put() with stream class objects.
+ *
+ * These functions ensure that the stream class won't be destroyed while it
+ * is in use. The same number of get and put (plus one extra put to
+ * release the initial reference done at creation) have to be done to
+ * destroy a stream class.
+ *
+ * When the stream class' reference count is decremented to 0 by a
+ * bt_ctf_stream_class_put, the stream class is freed.
+ *
+ * @param stream_class Stream class.
+ */
+extern void bt_ctf_stream_class_get(struct bt_ctf_stream_class *stream_class);
+extern void bt_ctf_stream_class_put(struct bt_ctf_stream_class *stream_class);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BABELTRACE_CTF_WRITER_STREAM_CLASS_H */