ceph/src/dpdk/lib/librte_eal/common/include/arch/x86/rte_rwlock.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2015 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef _RTE_RWLOCK_X86_64_H_
  35 #define _RTE_RWLOCK_X86_64_H_
  36
  37 #ifdef __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 #include "generic/rte_rwlock.h"
  42 #include "rte_spinlock.h"
  43
  44 static inline void
  45 rte_rwlock_read_lock_tm(rte_rwlock_t *rwl)
  46 {
  47         if (likely(rte_try_tm(&rwl->cnt)))
  48                 return;
  49         rte_rwlock_read_lock(rwl);
  50 }
  51
  52 static inline void
  53 rte_rwlock_read_unlock_tm(rte_rwlock_t *rwl)
  54 {
  55         if (unlikely(rwl->cnt))
  56                 rte_rwlock_read_unlock(rwl);
  57         else
  58                 rte_xend();
  59 }
  60
  61 static inline void
  62 rte_rwlock_write_lock_tm(rte_rwlock_t *rwl)
  63 {
  64         if (likely(rte_try_tm(&rwl->cnt)))
  65                 return;
  66         rte_rwlock_write_lock(rwl);
  67 }
  68
  69 static inline void
  70 rte_rwlock_write_unlock_tm(rte_rwlock_t *rwl)
  71 {
  72         if (unlikely(rwl->cnt))
  73                 rte_rwlock_write_unlock(rwl);
  74         else
  75                 rte_xend();
  76 }
  77
  78 #ifdef __cplusplus
  79 }
  80 #endif
  81
  82 #endif /* _RTE_RWLOCK_X86_64_H_ */