liblttng-ust/lttng-ust-urcu-pointer.c

   1 /*
   2  * lttng-ust-urcu-pointer.c
   3  *
   4  * library wrappers to be used by non-LGPL compatible source code.
   5  *
   6  * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  *
  23  * IBM's contributions to this file may be relicensed under LGPLv2 or later.
  24  */
  25
  26 #include <urcu/uatomic.h>
  27
  28 #include <lttng/urcu/static/pointer.h>
  29 /* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */
  30 #include <lttng/urcu/pointer.h>
  31
  32 void *lttng_ust_rcu_dereference_sym(void *p)
  33 {
  34         return _lttng_ust_rcu_dereference(p);
  35 }
  36
  37 void *lttng_ust_rcu_set_pointer_sym(void **p, void *v)
  38 {
  39         cmm_wmb();
  40         uatomic_set(p, v);
  41         return v;
  42 }
  43
  44 void *lttng_ust_rcu_xchg_pointer_sym(void **p, void *v)
  45 {
  46         cmm_wmb();
  47         return uatomic_xchg(p, v);
  48 }
  49
  50 void *lttng_ust_rcu_cmpxchg_pointer_sym(void **p, void *old, void *_new)
  51 {
  52         cmm_wmb();
  53         return uatomic_cmpxchg(p, old, _new);
  54 }