* all copies or substantial portions of the Software.
*/
+#include <glib.h>
+#include <stdint.h>
+
+typedef GQuark bt_event_name;
+
/* Forward declarations */
struct babeltrace_iter;
-struct babeltrace_iter_pos;
-struct babeltrace_iter_stream_pos;
struct trace_collection;
struct ctf_stream_event;
struct ctf_stream;
+struct babeltrace_saved_pos;
+struct bt_dependencies;
+
+enum bt_cb_ret {
+ BT_CB_OK = 0,
+ BT_CB_OK_STOP = 1,
+ BT_CB_ERROR_STOP = 2,
+ BT_CB_ERROR_CONTINUE = 3,
+};
+
+struct trace_collection_pos {
+ enum {
+ BT_SEEK_TIME, /* uses u.seek_time */
+ BT_SEEK_RESTORE, /* uses u.restore */
+ BT_SEEK_CUR,
+ BT_SEEK_BEGIN,
+ BT_SEEK_END,
+ } type;
+ union {
+ uint64_t seek_time;
+ struct babeltrace_saved_pos *restore;
+ } u;
+};
+
+struct bt_ctf_data {
+ struct ctf_stream_event *event;
+ struct ctf_stream *stream;
+};
/*
* babeltrace_iter_create - Allocate a trace collection iterator.
+ *
+ * begin_pos and end_pos are optional parameters to specify the position
+ * at which the trace collection should be seeked upon iterator
+ * creation, and the position at which iteration will start returning
+ * "EOF".
+ *
+ * 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.
*/
-struct babeltrace_iter *babeltrace_iter_create(struct trace_collection *tc);
+struct babeltrace_iter *babeltrace_iter_create(struct trace_collection *tc,
+ struct trace_collection_pos *begin_pos,
+ struct trace_collection_pos *end_pos);
/*
* babeltrace_iter_destroy - Free a trace collection iterator.
int babeltrace_iter_next(struct babeltrace_iter *iter);
/*
- * babeltrace_iter_get_pos - Get the current trace collection position.
+ * babeltrace_iter_save_pos - Save the current trace collection position.
*
* The position returned by this function needs to be freed by
* babeltrace_iter_free_pos after use.
*/
-struct babeltrace_iter_pos *
- babeltrace_iter_get_pos(struct babeltrace_iter *iter);
+struct trace_collection_pos *
+ babeltrace_iter_save_pos(struct babeltrace_iter *iter);
/*
* babeltrace_iter_free_pos - Free the position.
*/
-void babeltrace_iter_free_pos(struct babeltrace_iter_pos *pos);
+void babeltrace_iter_free_pos(struct trace_collection_pos *pos);
/*
- * babeltrace_iter_seek_pos - Seek the trace collection to the position.
- */
-int babeltrace_iter_seek_pos(struct babeltrace_iter *iter,
- struct babeltrace_iter_pos *pos);
-
-/*
- * babeltrace_iter_seek_time: Seek the trace collection to the given timestamp.
+ * babeltrace_iter_seek: seek iterator to given position.
*
- * Return EOF if timestamp is after the last event of the trace collection.
+ * Return EOF if position is after the last event of the trace collection.
* Return other negative value for other errors.
* Return 0 for success.
*/
-int babeltrace_iter_seek_time(struct babeltrace_iter *iter,
- uint64_t timestamp);
+int babeltrace_iter_seek(struct babeltrace_iter *iter,
+ const struct trace_collection_pos *pos);
/*
* babeltrace_iter_read_event: Read the iterator's current event data.
struct ctf_stream **stream,
struct ctf_stream_event **event);
+/*
+ * Receives a variable number of strings as parameter, ended with NULL.
+ */
+struct bt_dependencies *babeltrace_dependencies_create(const char *first, ...);
+
+/*
+ * struct bt_dependencies must be destroyed explicitly if not passed as
+ * parameter to a babeltrace_iter_add_callback().
+ */
+void babeltrace_dependencies_destroy(struct bt_dependencies *dep);
+
+/*
+ * babeltrace_iter_add_callback: Add a callback to iterator.
+ *
+ * @iter: trace collection iterator (input)
+ * @event: event to target. 0 for all events.
+ * @private_data: private data pointer to pass to the callback
+ * @flags: specific flags controlling the behavior of this callback
+ * (or'd).
+ *
+ * @callback: function pointer to call
+ * @depends: struct bt_dependency detailing the required computation results.
+ * Ends with 0.
+ * @weak_depends: struct bt_dependency detailing the optional computation
+ * results that can be optionally consumed by this
+ * callback.
+ * @provides: struct bt_dependency detailing the computation results
+ * provided by this callback.
+ * Ends with 0.
+ *
+ * "depends", "weak_depends" and "provides" memory is handled by the
+ * babeltrace library after this call succeeds or fails. These objects
+ * can still be used by the caller until the babeltrace iterator is
+ * destroyed, but they belong to the babeltrace library.
+ *
+ * (note to implementor: we need to keep a gptrarray of struct
+ * bt_dependencies to "garbage collect" in struct babeltrace_iter, and
+ * dependencies need to have a refcount to handle the case where they
+ * would be passed to more than one iterator. Upon iterator detroy, we
+ * iterate on all the gc ptrarray and decrement the refcounts, freeing
+ * if we reach 0.)
+ * (note to implementor: we calculate the dependency graph when
+ * babeltrace_iter_read_event() is executed after a
+ * babeltrace_iter_add_callback(). Beware that it is valid to create/add
+ * callbacks/read/add more callbacks/read some more.)
+ */
+int babeltrace_iter_add_callback(struct babeltrace_iter *iter,
+ bt_event_name event, void *private_data, int flags,
+ enum bt_cb_ret (*callback)(struct bt_ctf_data *ctf_data,
+ void *caller_data),
+ struct bt_dependencies *depends,
+ struct bt_dependencies *weak_depends,
+ struct bt_dependencies *provides);
+
+/*
+ * For flags parameter above.
+ */
+enum {
+ BT_FLAGS_FREE_PRIVATE_DATA = (1 << 0),
+};
+
#endif /* _BABELTRACE_H */
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