include/lttng/tracepoint-rcu.h

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #ifndef _LTTNG_TRACEPOINT_RCU_H
   8 #define _LTTNG_TRACEPOINT_RCU_H
   9
  10 #include <urcu/compiler.h>
  11 #include <lttng/urcu/pointer.h>
  12
  13 #ifdef _LGPL_SOURCE
  14
  15 #include <lttng/urcu/urcu-ust.h>
  16
  17 #define tp_rcu_read_lock        lttng_ust_urcu_read_lock
  18 #define tp_rcu_read_unlock      lttng_ust_urcu_read_unlock
  19 #define tp_rcu_dereference      lttng_ust_rcu_dereference
  20 #define TP_RCU_LINK_TEST()      1
  21
  22 #else   /* _LGPL_SOURCE */
  23
  24 #define tp_rcu_read_lock        tracepoint_dlopen_ptr->rcu_read_lock_sym
  25 #define tp_rcu_read_unlock      tracepoint_dlopen_ptr->rcu_read_unlock_sym
  26
  27 #define tp_rcu_dereference(p)                                              \
  28                 URCU_FORCE_CAST(__typeof__(p),                             \
  29                         tracepoint_dlopen_ptr->rcu_dereference_sym(URCU_FORCE_CAST(void *, p)))
  30
  31 #define TP_RCU_LINK_TEST()      (tracepoint_dlopen_ptr && tp_rcu_read_lock)
  32
  33 #endif  /* _LGPL_SOURCE */
  34
  35 #endif  /* _LTTNG_TRACEPOINT_RCU_H */