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/*
* Copyright (c) 2013 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
#define OVS_ATOMIC_PTHREADS_IMPL 1
#define DEFINE_PTHREAD_ATOMIC(TYPE, NAME) \
typedef struct { \
TYPE value; \
pthread_mutex_t mutex; \
} NAME;
#define ATOMIC_BOOL_LOCK_FREE 0
DEFINE_PTHREAD_ATOMIC(bool, atomic_bool);
#define ATOMIC_CHAR_LOCK_FREE 0
DEFINE_PTHREAD_ATOMIC(char, atomic_char);
DEFINE_PTHREAD_ATOMIC(signed char, atomic_schar);
DEFINE_PTHREAD_ATOMIC(unsigned char, atomic_uchar);
#define ATOMIC_SHORT_LOCK_FREE 0
DEFINE_PTHREAD_ATOMIC(short, atomic_short);
DEFINE_PTHREAD_ATOMIC(unsigned short, atomic_ushort);
#define ATOMIC_INT_LOCK_FREE 0
DEFINE_PTHREAD_ATOMIC(int, atomic_int);
DEFINE_PTHREAD_ATOMIC(unsigned int, atomic_uint);
#define ATOMIC_LONG_LOCK_FREE 0
DEFINE_PTHREAD_ATOMIC(long, atomic_long);
DEFINE_PTHREAD_ATOMIC(unsigned long, atomic_ulong);
#define ATOMIC_LLONG_LOCK_FREE 0
DEFINE_PTHREAD_ATOMIC(long long, atomic_llong);
DEFINE_PTHREAD_ATOMIC(unsigned long long, atomic_ullong);
DEFINE_PTHREAD_ATOMIC(size_t, atomic_size_t);
DEFINE_PTHREAD_ATOMIC(ptrdiff_t, atomic_ptrdiff_t);
DEFINE_PTHREAD_ATOMIC(intmax_t, atomic_intmax_t);
DEFINE_PTHREAD_ATOMIC(uintmax_t, atomic_uintmax_t);
#define ATOMIC_POINTER_LOCK_FREE 0
DEFINE_PTHREAD_ATOMIC(intptr_t, atomic_intptr_t);
DEFINE_PTHREAD_ATOMIC(uintptr_t, atomic_uintptr_t);
/* Nonstandard atomic types. */
DEFINE_PTHREAD_ATOMIC(uint8_t, atomic_uint8_t);
DEFINE_PTHREAD_ATOMIC(uint16_t, atomic_uint16_t);
DEFINE_PTHREAD_ATOMIC(uint32_t, atomic_uint32_t);
DEFINE_PTHREAD_ATOMIC(int8_t, atomic_int8_t);
DEFINE_PTHREAD_ATOMIC(int16_t, atomic_int16_t);
DEFINE_PTHREAD_ATOMIC(int32_t, atomic_int32_t);
DEFINE_PTHREAD_ATOMIC(uint64_t, atomic_uint64_t);
DEFINE_PTHREAD_ATOMIC(int64_t, atomic_int64_t);
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_VAR_INIT(VALUE) { VALUE, PTHREAD_MUTEX_INITIALIZER }
#define atomic_init(OBJECT, VALUE) \
((OBJECT)->value = (VALUE), \
pthread_mutex_init(&(OBJECT)->mutex, NULL), \
(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) \
(pthread_mutex_lock(&(DST)->mutex), \
(DST)->value = (SRC), \
pthread_mutex_unlock(&(DST)->mutex), \
(void) 0)
#define atomic_store_explicit(DST, SRC, ORDER) \
((void) (ORDER), atomic_store(DST, SRC))
#define atomic_read(SRC, DST) \
(pthread_mutex_lock(CONST_CAST(pthread_mutex_t *, &(SRC)->mutex)), \
*(DST) = (SRC)->value, \
pthread_mutex_unlock(CONST_CAST(pthread_mutex_t *, &(SRC)->mutex)), \
(void) 0)
#define atomic_read_explicit(SRC, DST, ORDER) \
((void) (ORDER), atomic_read(SRC, DST))
#define atomic_op__(RMW, OPERATOR, OPERAND, ORIG) \
(pthread_mutex_lock(&(RMW)->mutex), \
*(ORIG) = (RMW)->value, \
(RMW)->value OPERATOR (OPERAND), \
pthread_mutex_unlock(&(RMW)->mutex), \
(void) 0)
#define atomic_add(RMW, OPERAND, ORIG) atomic_op__(RMW, +=, OPERAND, ORIG)
#define atomic_sub(RMW, OPERAND, ORIG) atomic_op__(RMW, -=, OPERAND, ORIG)
#define atomic_or( RMW, OPERAND, ORIG) atomic_op__(RMW, |=, OPERAND, ORIG)
#define atomic_xor(RMW, OPERAND, ORIG) atomic_op__(RMW, ^=, OPERAND, ORIG)
#define atomic_and(RMW, OPERAND, ORIG) atomic_op__(RMW, &=, OPERAND, ORIG)
#define atomic_add_explicit(RMW, OPERAND, ORIG, ORDER) \
((void) (ORDER), atomic_add(RMW, OPERAND, ORIG))
#define atomic_sub_explicit(RMW, OPERAND, ORIG, ORDER) \
((void) (ORDER), atomic_sub(RMW, OPERAND, ORIG))
#define atomic_or_explicit(RMW, OPERAND, ORIG, ORDER) \
((void) (ORDER), atomic_or(RMW, OPERAND, ORIG))
#define atomic_xor_explicit(RMW, OPERAND, ORIG, ORDER) \
((void) (ORDER), atomic_xor(RMW, OPERAND, ORIG))
#define atomic_and_explicit(RMW, OPERAND, ORIG, ORDER) \
((void) (ORDER), atomic_and(RMW, OPERAND, ORIG))
/* atomic_flag */
typedef struct {
bool b;
pthread_mutex_t mutex;
} atomic_flag;
#define ATOMIC_FLAG_INIT { false, PTHREAD_MUTEX_INITIALIZER }
bool atomic_flag_test_and_set(volatile atomic_flag *);
bool atomic_flag_test_and_set_explicit(volatile atomic_flag *, memory_order);
void atomic_flag_clear(volatile atomic_flag *);
void atomic_flag_clear_explicit(volatile atomic_flag *, memory_order);
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