lib/ovs-atomic-pthreads.c

   1 /*
   2  * Copyright (c) 2013 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18
  19 #include "ovs-atomic.h"
  20 #include "ovs-thread.h"
  21
  22 #if OVS_ATOMIC_PTHREADS_IMPL
  23 bool
  24 atomic_flag_test_and_set(volatile atomic_flag *flag_)
  25 {
  26     atomic_flag *flag = CONST_CAST(atomic_flag *, flag_);
  27     bool old_value;
  28
  29     ovs_mutex_lock(&flag->mutex);
  30     old_value = flag->b;
  31     flag->b = true;
  32     ovs_mutex_unlock(&flag->mutex);
  33
  34     return old_value;
  35 }
  36
  37 bool
  38 atomic_flag_test_and_set_explicit(volatile atomic_flag *flag,
  39                                   memory_order order OVS_UNUSED)
  40 {
  41     return atomic_flag_test_and_set(flag);
  42 }
  43
  44 void
  45 atomic_flag_clear(volatile atomic_flag *flag_)
  46 {
  47     atomic_flag *flag = CONST_CAST(atomic_flag *, flag_);
  48
  49     ovs_mutex_lock(&flag->mutex);
  50     flag->b = false;
  51     ovs_mutex_unlock(&flag->mutex);
  52 }
  53
  54 void
  55 atomic_flag_clear_explicit(volatile atomic_flag *flag,
  56                            memory_order order OVS_UNUSED)
  57 {
  58     return atomic_flag_clear(flag);
  59 }
  60
  61 #endif  /* OVS_ATOMIC_PTHREADS_IMPL */