0efc23c5c61b749c996783f604c26a537d822416
4 * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * Holds LTTng probes registry.
9 #include <linux/module.h>
10 #include <linux/list.h>
11 #include <linux/mutex.h>
13 #include "ltt-events.h"
15 static LIST_HEAD(probe_list
);
16 static DEFINE_MUTEX(probe_mutex
);
19 const struct lttng_event_desc
*find_event(const char *name
)
21 struct lttng_probe_desc
*probe_desc
;
24 list_for_each_entry(probe_desc
, &probe_list
, head
) {
25 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
26 if (!strcmp(probe_desc
->event_desc
[i
].name
, name
))
27 return &probe_desc
->event_desc
[i
];
33 int ltt_probe_register(struct lttng_probe_desc
*desc
)
38 mutex_lock(&probe_mutex
);
40 * TODO: This is O(N^2). Turn into a hash table when probe registration
41 * overhead becomes an issue.
43 for (i
= 0; i
< desc
->nr_events
; i
++) {
44 if (find_event(desc
->event_desc
[i
].name
)) {
49 list_add(&desc
->head
, &probe_list
);
51 mutex_unlock(&probe_mutex
);
54 EXPORT_SYMBOL_GPL(ltt_probe_register
);
56 void ltt_probe_unregister(struct lttng_probe_desc
*desc
)
58 mutex_lock(&probe_mutex
);
59 list_del(&desc
->head
);
60 mutex_unlock(&probe_mutex
);
62 EXPORT_SYMBOL_GPL(ltt_probe_unregister
);
64 const struct lttng_event_desc
*ltt_event_get(const char *name
)
66 const struct lttng_event_desc
*event
;
69 mutex_lock(&probe_mutex
);
70 event
= find_event(name
);
71 mutex_unlock(&probe_mutex
);
74 ret
= try_module_get(event
->owner
);
78 EXPORT_SYMBOL_GPL(ltt_event_get
);
80 void ltt_event_put(const struct lttng_event_desc
*event
)
82 module_put(event
->owner
);
84 EXPORT_SYMBOL_GPL(ltt_event_put
);
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