include/lttng/tracepoint-internal.h

   1 #ifndef _LTTNG_TRACEPOINT_INTERNAL_H
   2 #define _LTTNG_TRACEPOINT_INTERNAL_H
   3
   4 /*
   5  * tracepoint-internal.h
   6  *
   7  * Tracepoint internal header.
   8  *
   9  * Copyright (C) 2008 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
  10  * Copyright (C) 2009 Pierre-Marc Fournier
  11  * Copyright (C) 2009 Steven Rostedt <rostedt@goodmis.org>
  12  *
  13  * This library is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU Lesser General Public
  15  * License as published by the Free Software Foundation;
  16  * version 2.1 of the License.
  17  *
  18  * This library is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * Lesser General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU Lesser General Public
  24  * License along with this library; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  26  *
  27  * Heavily inspired from the Linux Kernel Markers.
  28  */
  29
  30 #include <urcu-bp.h>
  31 #include <lttng/core.h>
  32 #include <urcu/list.h>
  33 #include <lttng/tracepoint-types.h>
  34
  35 struct tracepoint_lib {
  36         struct tracepoint * const *tracepoints_start;
  37         int tracepoints_count;
  38         struct cds_list_head list;
  39 };
  40
  41 extern int tracepoint_probe_register_noupdate(const char *name, void *probe,
  42                                               void *data);
  43 extern int tracepoint_probe_unregister_noupdate(const char *name, void *probe,
  44                                                 void *data);
  45 extern void tracepoint_probe_update_all(void);
  46
  47 struct tracepoint_iter {
  48         struct tracepoint_lib *lib;
  49         struct tracepoint * const *tracepoint;
  50 };
  51
  52 extern void tracepoint_iter_start(struct tracepoint_iter *iter);
  53 extern void tracepoint_iter_next(struct tracepoint_iter *iter);
  54 extern void tracepoint_iter_stop(struct tracepoint_iter *iter);
  55 extern void tracepoint_iter_reset(struct tracepoint_iter *iter);
  56 extern int tracepoint_get_iter_range(struct tracepoint * const **tracepoint,
  57         struct tracepoint * const *begin, struct tracepoint * const *end);
  58
  59 /*
  60  * tracepoint_synchronize_unregister must be called between the last tracepoint
  61  * probe unregistration and the end of module exit to make sure there is no
  62  * caller executing a probe when it is freed.
  63  */
  64 static inline void tracepoint_synchronize_unregister(void)
  65 {
  66         synchronize_rcu();
  67 }
  68
  69 struct trace_event_iter {
  70         struct trace_event_lib *lib;
  71         struct trace_event * const *trace_event;
  72 };
  73
  74 extern void trace_event_iter_start(struct trace_event_iter *iter);
  75 extern void trace_event_iter_next(struct trace_event_iter *iter);
  76 extern void trace_event_iter_stop(struct trace_event_iter *iter);
  77 extern void trace_event_iter_reset(struct trace_event_iter *iter);
  78
  79 extern void trace_event_update_process(void);
  80 extern int is_trace_event_enabled(const char *channel, const char *name);
  81
  82 extern void init_tracepoint(void);
  83 extern void exit_tracepoint(void);
  84
  85 #endif /* _LTTNG_TRACEPOINT_INTERNAL_H */