include/lttng/tracepoint-rcu.h

   1 #ifndef _LTTNG_TRACEPOINT_RCU_H
   2 #define _LTTNG_TRACEPOINT_RCU_H
   3
   4 /*
   5  * Copyright 2011-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  */
  25
  26 #include <urcu/compiler.h>
  27 #include <lttng/urcu/pointer.h>
  28
  29 #ifdef _LGPL_SOURCE
  30
  31 #include <lttng/urcu/urcu-ust.h>
  32
  33 #define tp_rcu_read_lock        lttng_ust_urcu_read_lock
  34 #define tp_rcu_read_unlock      lttng_ust_urcu_read_unlock
  35 #define tp_rcu_dereference      lttng_ust_rcu_dereference
  36 #define TP_RCU_LINK_TEST()      1
  37
  38 #else   /* _LGPL_SOURCE */
  39
  40 #define tp_rcu_read_lock        tracepoint_dlopen_ptr->rcu_read_lock_sym
  41 #define tp_rcu_read_unlock      tracepoint_dlopen_ptr->rcu_read_unlock_sym
  42
  43 #define tp_rcu_dereference(p)                                              \
  44                 URCU_FORCE_CAST(__typeof__(p),                             \
  45                         tracepoint_dlopen_ptr->rcu_dereference_sym(URCU_FORCE_CAST(void *, p)))
  46
  47 #define TP_RCU_LINK_TEST()      (tracepoint_dlopen_ptr && tp_rcu_read_lock)
  48
  49 #endif  /* _LGPL_SOURCE */
  50
  51 #endif  /* _LTTNG_TRACEPOINT_RCU_H */