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https://github.com/openvswitch/ovs
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25045d755e
Add support for atomic compare_exchange operations. Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com> Acked-by: Ben Pfaff <blp@nicira.com>
141 lines
4.2 KiB
C
141 lines
4.2 KiB
C
/*
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* Copyright (c) 2013, 2014 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* This header implements atomic operation primitives using pthreads. */
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#ifndef IN_OVS_ATOMIC_H
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#error "This header should only be included indirectly via ovs-atomic.h."
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#endif
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#include "ovs-atomic-locked.h"
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#define OVS_ATOMIC_PTHREADS_IMPL 1
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#define ATOMIC(TYPE) TYPE
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#define ATOMIC_BOOL_LOCK_FREE 0
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#define ATOMIC_CHAR_LOCK_FREE 0
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#define ATOMIC_SHORT_LOCK_FREE 0
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#define ATOMIC_INT_LOCK_FREE 0
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#define ATOMIC_LONG_LOCK_FREE 0
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#define ATOMIC_LLONG_LOCK_FREE 0
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#define ATOMIC_POINTER_LOCK_FREE 0
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typedef enum {
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memory_order_relaxed,
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memory_order_consume,
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memory_order_acquire,
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memory_order_release,
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memory_order_acq_rel,
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memory_order_seq_cst
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} memory_order;
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#define ATOMIC_VAR_INIT(VALUE) (VALUE)
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#define atomic_init(OBJECT, VALUE) (*(OBJECT) = (VALUE), (void) 0)
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static inline void
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atomic_thread_fence(memory_order order OVS_UNUSED)
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{
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/* Nothing to do. */
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}
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static inline void
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atomic_signal_fence(memory_order order OVS_UNUSED)
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{
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/* Nothing to do. */
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}
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#define atomic_is_lock_free(OBJ) false
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#define atomic_store(DST, SRC) atomic_store_locked(DST, SRC)
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#define atomic_store_explicit(DST, SRC, ORDER) \
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((void) (ORDER), atomic_store(DST, SRC))
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#define atomic_read(SRC, DST) atomic_read_locked(SRC, DST)
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#define atomic_read_explicit(SRC, DST, ORDER) \
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((void) (ORDER), atomic_read(SRC, DST))
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#define atomic_compare_exchange_strong(DST, EXP, SRC) \
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atomic_compare_exchange_locked(DST, EXP, SRC)
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#define atomic_compare_exchange_strong_explicit(DST, EXP, SRC, ORD1, ORD2) \
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((void) (ORD1), (void) (ORD2), \
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atomic_compare_exchange_strong(DST, EXP, SRC))
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#define atomic_compare_exchange_weak \
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atomic_compare_exchange_strong
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#define atomic_compare_exchange_weak_explicit \
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atomic_compare_exchange_strong_explicit
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#define atomic_add(RMW, ARG, ORIG) atomic_op_locked(RMW, add, ARG, ORIG)
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#define atomic_sub(RMW, ARG, ORIG) atomic_op_locked(RMW, sub, ARG, ORIG)
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#define atomic_or( RMW, ARG, ORIG) atomic_op_locked(RMW, or, ARG, ORIG)
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#define atomic_xor(RMW, ARG, ORIG) atomic_op_locked(RMW, xor, ARG, ORIG)
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#define atomic_and(RMW, ARG, ORIG) atomic_op_locked(RMW, and, ARG, ORIG)
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#define atomic_add_explicit(RMW, ARG, ORIG, ORDER) \
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((void) (ORDER), atomic_add(RMW, ARG, ORIG))
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#define atomic_sub_explicit(RMW, ARG, ORIG, ORDER) \
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((void) (ORDER), atomic_sub(RMW, ARG, ORIG))
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#define atomic_or_explicit(RMW, ARG, ORIG, ORDER) \
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((void) (ORDER), atomic_or(RMW, ARG, ORIG))
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#define atomic_xor_explicit(RMW, ARG, ORIG, ORDER) \
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((void) (ORDER), atomic_xor(RMW, ARG, ORIG))
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#define atomic_and_explicit(RMW, ARG, ORIG, ORDER) \
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((void) (ORDER), atomic_and(RMW, ARG, ORIG))
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/* atomic_flag */
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typedef struct {
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bool b;
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} atomic_flag;
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#define ATOMIC_FLAG_INIT { false }
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static inline bool
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atomic_flag_test_and_set(volatile atomic_flag *flag_)
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{
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atomic_flag *flag = CONST_CAST(atomic_flag *, flag_);
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bool old_value;
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atomic_lock__(flag);
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old_value = flag->b;
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flag->b = true;
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atomic_unlock__(flag);
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return old_value;
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}
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static inline bool
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atomic_flag_test_and_set_explicit(volatile atomic_flag *flag,
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memory_order order OVS_UNUSED)
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{
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return atomic_flag_test_and_set(flag);
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}
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static inline void
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atomic_flag_clear(volatile atomic_flag *flag_)
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{
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atomic_flag *flag = CONST_CAST(atomic_flag *, flag_);
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atomic_lock__(flag);
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flag->b = false;
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atomic_unlock__(flag);
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}
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static inline void
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atomic_flag_clear_explicit(volatile atomic_flag *flag,
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memory_order order OVS_UNUSED)
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{
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atomic_flag_clear(flag);
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}
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