include/lttng/tracepoint-rcu.h

   1 #ifndef _LTTNG_TRACEPOINT_RCU_H
   2 #define _LTTNG_TRACEPOINT_RCU_H
   3
   4 /*
   5  * Copyright (c) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  *
   7  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
   8  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
   9  *
  10  * Permission is hereby granted to use or copy this program
  11  * for any purpose,  provided the above notices are retained on all copies.
  12  * Permission to modify the code and to distribute modified code is granted,
  13  * provided the above notices are retained, and a notice that the code was
  14  * modified is included with the above copyright notice.
  15  *
  16  * This file allows weak linking on tracepoint RCU symbols for non-LGPL
  17  * code.
  18  */
  19
  20 #include <urcu/compiler.h>
  21
  22 #ifdef _LGPL_SOURCE
  23
  24 #include <urcu-bp.h>
  25
  26 #define tp_rcu_read_lock_bp     rcu_read_lock_bp
  27 #define tp_rcu_read_unlock_bp   rcu_read_unlock_bp
  28 #define tp_rcu_dereference_bp   rcu_dereference_bp
  29 #define TP_RCU_LINK_TEST()      1
  30
  31 #else   /* _LGPL_SOURCE */
  32
  33 #define tp_rcu_read_lock_bp     tracepoint_dlopen.rcu_read_lock_sym_bp
  34 #define tp_rcu_read_unlock_bp   tracepoint_dlopen.rcu_read_unlock_sym_bp
  35
  36 #define tp_rcu_dereference_bp(p)                                             \
  37         ({                                                                   \
  38                 typeof(p) _________p1 = URCU_FORCE_CAST(typeof(p),           \
  39                         tracepoint_dlopen.rcu_dereference_sym_bp(URCU_FORCE_CAST(void *, p))); \
  40                 (_________p1);                                               \
  41         })
  42
  43 #define TP_RCU_LINK_TEST()      tp_rcu_read_lock_bp
  44
  45 #endif  /* _LGPL_SOURCE */
  46
  47 #endif  /* _LTTNG_TRACEPOINT_RCU_H */