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/*
* Copyright (c) 2013, 2014 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* This header implements atomic operation primitives using pthreads. */
#ifndef IN_OVS_ATOMIC_H
#error "This header should only be included indirectly via ovs-atomic.h."
#endif
#include "ovs-atomic-locked.h"
#define OVS_ATOMIC_PTHREADS_IMPL 1
#define ATOMIC(TYPE) TYPE
#define ATOMIC_BOOL_LOCK_FREE 0
#define ATOMIC_CHAR_LOCK_FREE 0
#define ATOMIC_SHORT_LOCK_FREE 0
#define ATOMIC_INT_LOCK_FREE 0
#define ATOMIC_LONG_LOCK_FREE 0
#define ATOMIC_LLONG_LOCK_FREE 0
#define ATOMIC_POINTER_LOCK_FREE 0
typedef enum {
memory_order_relaxed,
memory_order_consume,
memory_order_acquire,
memory_order_release,
memory_order_acq_rel,
memory_order_seq_cst
} memory_order;
#define atomic_init(OBJECT, VALUE) (*(OBJECT) = (VALUE), (void) 0)
static inline void
atomic_thread_fence(memory_order order OVS_UNUSED)
{
/* Nothing to do. */
}
static inline void
atomic_signal_fence(memory_order order OVS_UNUSED)
{
/* Nothing to do. */
}
#define atomic_is_lock_free(OBJ) false
#define atomic_store(DST, SRC) atomic_store_locked(DST, SRC)
#define atomic_store_explicit(DST, SRC, ORDER) \
((void) (ORDER), atomic_store(DST, SRC))
#define atomic_read(SRC, DST) atomic_read_locked(SRC, DST)
#define atomic_read_explicit(SRC, DST, ORDER) \
((void) (ORDER), atomic_read(SRC, DST))
#define atomic_compare_exchange_strong(DST, EXP, SRC) \
atomic_compare_exchange_locked(DST, EXP, SRC)
#define atomic_compare_exchange_strong_explicit(DST, EXP, SRC, ORD1, ORD2) \
((void) (ORD1), (void) (ORD2), \
atomic_compare_exchange_strong(DST, EXP, SRC))
#define atomic_compare_exchange_weak \
atomic_compare_exchange_strong
#define atomic_compare_exchange_weak_explicit \
atomic_compare_exchange_strong_explicit
#define atomic_exchange(DST, SRC) \
atomic_exchange_locked(DST, SRC)
#define atomic_exchange_explicit(DST, SRC, ORDER) \
((void) (ORDER), atomic_exchange(DST, SRC))
#define atomic_add(RMW, ARG, ORIG) atomic_op_locked(RMW, add, ARG, ORIG)
#define atomic_sub(RMW, ARG, ORIG) atomic_op_locked(RMW, sub, ARG, ORIG)
#define atomic_or( RMW, ARG, ORIG) atomic_op_locked(RMW, or, ARG, ORIG)
#define atomic_xor(RMW, ARG, ORIG) atomic_op_locked(RMW, xor, ARG, ORIG)
#define atomic_and(RMW, ARG, ORIG) atomic_op_locked(RMW, and, ARG, ORIG)
#define atomic_add_explicit(RMW, ARG, ORIG, ORDER) \
((void) (ORDER), atomic_add(RMW, ARG, ORIG))
#define atomic_sub_explicit(RMW, ARG, ORIG, ORDER) \
((void) (ORDER), atomic_sub(RMW, ARG, ORIG))
#define atomic_or_explicit(RMW, ARG, ORIG, ORDER) \
((void) (ORDER), atomic_or(RMW, ARG, ORIG))
#define atomic_xor_explicit(RMW, ARG, ORIG, ORDER) \
((void) (ORDER), atomic_xor(RMW, ARG, ORIG))
#define atomic_and_explicit(RMW, ARG, ORIG, ORDER) \
((void) (ORDER), atomic_and(RMW, ARG, ORIG))
/* atomic_flag */
typedef struct {
bool b;
} atomic_flag;
#define ATOMIC_FLAG_INIT { false }
static inline bool
atomic_flag_test_and_set(volatile atomic_flag *flag_)
{
atomic_flag *flag = CONST_CAST(atomic_flag *, flag_);
bool old_value;
atomic_lock__(flag);
old_value = flag->b;
flag->b = true;
atomic_unlock__(flag);
return old_value;
}
static inline bool
atomic_flag_test_and_set_explicit(volatile atomic_flag *flag,
memory_order order OVS_UNUSED)
{
return atomic_flag_test_and_set(flag);
}
static inline void
atomic_flag_clear(volatile atomic_flag *flag_)
{
atomic_flag *flag = CONST_CAST(atomic_flag *, flag_);
atomic_lock__(flag);
flag->b = false;
atomic_unlock__(flag);
}
static inline void
atomic_flag_clear_explicit(volatile atomic_flag *flag,
memory_order order OVS_UNUSED)
{
atomic_flag_clear(flag);
}
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