wrapper/atomic.h

   1 #ifndef _LTTNG_WRAPPER_ATOMIC_H
   2 #define _LTTNG_WRAPPER_ATOMIC_H
   3
   4 /*
   5  * wrapper/atomic.h
   6  *
   7  * wrapper around linux/atomic.h.
   8  *
   9  * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; only
  14  * version 2.1 of the License.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  24  */
  25
  26 #include <linux/version.h>
  27 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37))
  28 #include <linux/atomic.h>
  29 #else
  30 #include <asm/atomic.h>
  31 #endif
  32
  33 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0))
  34 static inline void lttng_smp_mb__before_atomic(void)
  35 {
  36         smp_mb__before_atomic();
  37 }
  38
  39 static inline void lttng_smp_mb__after_atomic(void)
  40 {
  41         smp_mb__after_atomic();
  42 }
  43 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)) */
  44 static inline void lttng_smp_mb__before_atomic(void)
  45 {
  46         smp_mb__before_atomic_inc();
  47 }
  48
  49 static inline void lttng_smp_mb__after_atomic(void)
  50 {
  51         smp_mb__after_atomic_inc();
  52 }
  53 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)) */
  54
  55 #endif /* _LTTNG_WRAPPER_ATOMIC_H */