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

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-or-later
   3  *
   4  * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
   6  *
   7  * library wrappers to be used by non-LGPL compatible source code.
   8  */
   9
  10 #include <urcu/uatomic.h>
  11
  12 #include <lttng/urcu/static/pointer.h>
  13 /* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */
  14 #include <lttng/urcu/pointer.h>
  15
  16 void *lttng_ust_rcu_dereference_sym(void *p)
  17 {
  18         return _lttng_ust_rcu_dereference(p);
  19 }
  20
  21 void *lttng_ust_rcu_set_pointer_sym(void **p, void *v)
  22 {
  23         cmm_wmb();
  24         uatomic_set(p, v);
  25         return v;
  26 }
  27
  28 void *lttng_ust_rcu_xchg_pointer_sym(void **p, void *v)
  29 {
  30         cmm_wmb();
  31         return uatomic_xchg(p, v);
  32 }
  33
  34 void *lttng_ust_rcu_cmpxchg_pointer_sym(void **p, void *old, void *_new)
  35 {
  36         cmm_wmb();
  37         return uatomic_cmpxchg(p, old, _new);
  38 }