1 #ifndef _BABELTRACE_CTF_CALLBACKS_H
2 #define _BABELTRACE_CTF_CALLBACKS_H
9 * Copyright 2011-2012 EfficiOS Inc. and Linux Foundation
11 * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
12 * Julien Desfossez <julien.desfossez@efficios.com>
14 * Permission is hereby granted, free of charge, to any person obtaining
15 * a copy of this software and associated documentation files (the
16 * "Software"), to deal in the Software without restriction, including
17 * without limitation the rights to use, copy, modify, merge, publish,
18 * distribute, sublicense, and/or sell copies of the Software, and to
19 * permit persons to whom the Software is furnished to do so, subject to
20 * the following conditions:
22 * The above copyright notice and this permission notice shall be
23 * included in all copies or substantial portions of the Software.
26 #include <babeltrace/format.h>
28 /* Forward declarations */
30 struct bt_dependencies
;
36 BT_CB_ERROR_CONTINUE
= 3,
40 * Receives a variable number of strings as parameter, ended with NULL.
42 struct bt_dependencies
*babeltrace_dependencies_create(const char *first
, ...);
45 * struct bt_dependencies must be destroyed explicitly if not passed as
46 * parameter to a bt_ctf_iter_add_callback().
48 void babeltrace_dependencies_destroy(struct bt_dependencies
*dep
);
51 * bt_ctf_iter_add_callback: Add a callback to iterator.
53 * @iter: trace collection iterator (input)
54 * @event: event to target. 0 for all events.
55 * @private_data: private data pointer to pass to the callback
56 * @flags: specific flags controlling the behavior of this callback
59 * @callback: function pointer to call
60 * @depends: struct bt_dependency detailing the required computation results.
62 * @weak_depends: struct bt_dependency detailing the optional computation
63 * results that can be optionally consumed by this
65 * @provides: struct bt_dependency detailing the computation results
66 * provided by this callback.
69 * "depends", "weak_depends" and "provides" memory is handled by the
70 * babeltrace library after this call succeeds or fails. These objects
71 * can still be used by the caller until the babeltrace iterator is
72 * destroyed, but they belong to the babeltrace library.
74 * (note to implementor: we need to keep a gptrarray of struct
75 * bt_dependencies to "garbage collect" in struct bt_ctf_iter, and
76 * dependencies need to have a refcount to handle the case where they
77 * would be passed to more than one iterator. Upon iterator detroy, we
78 * iterate on all the gc ptrarray and decrement the refcounts, freeing
80 * (note to implementor: we calculate the dependency graph when
81 * bt_ctf_iter_read_event() is executed after a
82 * bt_ctf_iter_add_callback(). Beware that it is valid to create/add
83 * callbacks/read/add more callbacks/read some more.)
85 int bt_ctf_iter_add_callback(struct bt_ctf_iter
*iter
,
86 bt_intern_str event
, void *private_data
, int flags
,
87 enum bt_cb_ret (*callback
)(struct bt_ctf_event
*ctf_data
,
89 struct bt_dependencies
*depends
,
90 struct bt_dependencies
*weak_depends
,
91 struct bt_dependencies
*provides
);
94 * For flags parameter above.
97 BT_FLAGS_FREE_PRIVATE_DATA
= (1 << 0),
100 #endif /*_BABELTRACE_CTF_CALLBACKS_H */