include/lttng/tracepoint-internal.h

   1 #ifndef _UST_TRACEPOINT_INTERNAL_H
   2 #define _UST_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  * Ported to userspace by Pierre-Marc Fournier.
  30  */
  31
  32 #include <urcu-bp.h>
  33 #include <lttng/core.h>
  34 #include <urcu/list.h>
  35 #include <lttng/tracepoint.h>
  36
  37 struct tracepoint_lib {
  38         struct tracepoint * const *tracepoints_start;
  39         int tracepoints_count;
  40         struct cds_list_head list;
  41 };
  42
  43 extern int tracepoint_probe_register_noupdate(const char *name, void *probe,
  44                                               void *data);
  45 extern int tracepoint_probe_unregister_noupdate(const char *name, void *probe,
  46                                                 void *data);
  47 extern void tracepoint_probe_update_all(void);
  48
  49 struct tracepoint_iter {
  50         struct tracepoint_lib *lib;
  51         struct tracepoint * const *tracepoint;
  52 };
  53
  54 extern void tracepoint_iter_start(struct tracepoint_iter *iter);
  55 extern void tracepoint_iter_next(struct tracepoint_iter *iter);
  56 extern void tracepoint_iter_stop(struct tracepoint_iter *iter);
  57 extern void tracepoint_iter_reset(struct tracepoint_iter *iter);
  58 extern int tracepoint_get_iter_range(struct tracepoint * const **tracepoint,
  59         struct tracepoint * const *begin, struct tracepoint * const *end);
  60
  61 /*
  62  * tracepoint_synchronize_unregister must be called between the last tracepoint
  63  * probe unregistration and the end of module exit to make sure there is no
  64  * caller executing a probe when it is freed.
  65  */
  66 static inline void tracepoint_synchronize_unregister(void)
  67 {
  68         synchronize_rcu();
  69 }
  70
  71 struct trace_event_iter {
  72         struct trace_event_lib *lib;
  73         struct trace_event * const *trace_event;
  74 };
  75
  76 extern void trace_event_iter_start(struct trace_event_iter *iter);
  77 extern void trace_event_iter_next(struct trace_event_iter *iter);
  78 extern void trace_event_iter_stop(struct trace_event_iter *iter);
  79 extern void trace_event_iter_reset(struct trace_event_iter *iter);
  80
  81 extern void trace_event_update_process(void);
  82 extern int is_trace_event_enabled(const char *channel, const char *name);
  83
  84 extern void init_tracepoint(void);
  85 extern void exit_tracepoint(void);
  86
  87 #endif /* _UST_TRACEPOINT_INTERNAL_H */