libust/tracercore.h

   1 /*
   2  * Copyright (C) 2005,2006 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca)
   3  *
   4  * This contains the core definitions for the Linux Trace Toolkit.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #ifndef UST_TRACERCORE_H
  22 #define UST_TRACERCORE_H
  23
  24 #include <ust/kcompat/kcompat.h>
  25 #include <ust/core.h>
  26 #include <urcu/list.h>
  27
  28 /*
  29  * All modifications of ltt_traces must be done by ltt-tracer.c, while holding
  30  * the semaphore. Only reading of this information can be done elsewhere, with
  31  * the RCU mechanism : the preemption must be disabled while reading the
  32  * list.
  33  */
  34 struct ltt_traces {
  35         struct cds_list_head setup_head;        /* Pre-allocated traces list */
  36         struct cds_list_head head;              /* Allocated Traces list */
  37         unsigned int num_active_traces; /* Number of active traces */
  38 } ____cacheline_aligned;
  39
  40 extern struct ltt_traces ltt_traces;
  41
  42 /* Keep track of trap nesting inside LTT */
  43 extern __thread int ltt_nesting;
  44
  45 typedef int (*ltt_run_filter_functor)(void *trace, uint16_t eID);
  46 //typedef int (*ltt_run_filter_functor)(void *, __u16);
  47
  48 extern ltt_run_filter_functor ltt_run_filter;
  49
  50 extern void ltt_filter_register(ltt_run_filter_functor func);
  51 extern void ltt_filter_unregister(void);
  52
  53 #endif /* UST_TRACERCORE_H */