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nuttx/libs/libc/machine/arch_atomic64.c
zhangyu117 aee6fa1462 nuttx/atomic: use toolchain builtin atomic function 
The reason for using builtin atomic is that in C++, when include <atomic> in <nuttx/atomic.h> easily conflicts with third-party function libraries. We wanted to completely separate the implementation of <nuttx/atomic.h>.

There are two points:
1. use builtin function directly.
2. Without the standard library implementation, need implement "atomic_fetch_xxx", leading conflicts with the standard library used by third-party programs, introducing redefinition issues and requiring name changes.

Signed-off-by: zhangyu117 <zhangyu117@xiaomi.com>
2026-08-24 13:20:45 +08:00

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/****************************************************************************
* libs/libc/machine/arch_atomic64.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/spinlock.h>
#include "arch_atomic.h"
/****************************************************************************
* Private Data
****************************************************************************/
static spinlock_t g_atomic_lock = SP_UNLOCKED;
/****************************************************************************
* Private Functions
****************************************************************************/
static inline irqstate_t atomic_lock(void)
{
return spin_lock_irqsave(&g_atomic_lock);
}
static inline void atomic_unlock(irqstate_t flags)
{
spin_unlock_irqrestore(&g_atomic_lock, flags);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: __atomic_store_8
****************************************************************************/
STORE(__atomic_store_, 8, uint64_t)
#ifndef CONFIG_LIBC_ATOMIC_TOOLCHAIN
STORE(atomic_store_, 8, int64_t)
#endif
/****************************************************************************
* Name: __atomic_load_8
****************************************************************************/
LOAD(__atomic_load_, 8, uint64_t)
#ifndef CONFIG_LIBC_ATOMIC_TOOLCHAIN
LOAD(atomic_load_, 8, int64_t)
#endif
/****************************************************************************
* Name: __atomic_exchange_8
****************************************************************************/
EXCHANGE(__atomic_exchange_, 8, uint64_t)
#ifndef CONFIG_LIBC_ATOMIC_TOOLCHAIN
EXCHANGE(atomic_exchange_, 8, int64_t)
#endif
/****************************************************************************
* Name: __atomic_compare_exchange_8
****************************************************************************/
CMP_EXCHANGE(__atomic_compare_exchange_, 8, uint64_t)
#ifndef CONFIG_LIBC_ATOMIC_TOOLCHAIN
CMP_EXCHANGE(atomic_compare_exchange_, 8, int64_t)
#endif
/****************************************************************************
* Name: __atomic_flag_test_and_set_8
****************************************************************************/
FLAG_TEST_AND_SET(__atomic_flags_test_and_set_, 8, uint64_t)
#ifndef CONFIG_LIBC_ATOMIC_TOOLCHAIN
FLAG_TEST_AND_SET(atomic_flags_test_and_set_, 8, int64_t)
#endif
/****************************************************************************
* Name: __atomic_fetch_add_8
****************************************************************************/
FETCH_ADD(__atomic_fetch_add_, 8, uint64_t)
#ifndef CONFIG_LIBC_ATOMIC_TOOLCHAIN
FETCH_ADD(atomic_fetch_add_, 8, int64_t)
#endif
/****************************************************************************
* Name: __atomic_fetch_sub_8
****************************************************************************/
FETCH_SUB(__atomic_fetch_sub_, 8, uint64_t)
#ifndef CONFIG_LIBC_ATOMIC_TOOLCHAIN
FETCH_SUB(atomic_fetch_sub_, 8, int64_t)
#endif
/****************************************************************************
* Name: __atomic_fetch_and_8
****************************************************************************/
FETCH_AND(__atomic_fetch_and_, 8, uint64_t)
#ifndef CONFIG_LIBC_ATOMIC_TOOLCHAIN
FETCH_AND(atomic_fetch_and_, 8, int64_t)
#endif
/****************************************************************************
* Name: __atomic_fetch_or_8
****************************************************************************/
FETCH_OR(__atomic_fetch_or_, 8, uint64_t)
#ifndef CONFIG_LIBC_ATOMIC_TOOLCHAIN
FETCH_OR(atomic_fetch_or_, 8, int64_t)
#endif
/****************************************************************************
* Name: __atomic_fetch_xor_8
****************************************************************************/
FETCH_XOR(__atomic_fetch_xor_, 8, uint64_t)
#ifndef CONFIG_LIBC_ATOMIC_TOOLCHAIN
FETCH_XOR(atomic_fetch_xor_, 8, int64_t)
#endif
/* Clang define the __sync builtins, add #ifndef to avoid
* redefined/redeclared problem.
*/
#ifndef __clang__
/****************************************************************************
* Name: __sync_add_and_fetch_8
****************************************************************************/
SYNC_ADD_FETCH(__sync_add_and_fetch_, 8, uint64_t)
/****************************************************************************
* Name: __sync_sub_and_fetch_8
****************************************************************************/
SYNC_SUB_FETCH(__sync_sub_and_fetch_, 8, uint64_t)
/****************************************************************************
* Name: __sync_or_and_fetch_8
****************************************************************************/
SYNC_OR_FETCH(__sync_or_and_fetch_, 8, uint64_t)
/****************************************************************************
* Name: __sync_and_and_fetch_8
****************************************************************************/
SYNC_AND_FETCH(__sync_and_and_fetch_, 8, uint64_t)
/****************************************************************************
* Name: __sync_xor_and_fetch_8
****************************************************************************/
SYNC_XOR_FETCH(__sync_xor_and_fetch_, 8, uint64_t)
/****************************************************************************
* Name: __sync_nand_and_fetch_8
****************************************************************************/
SYNC_NAND_FETCH(__sync_nand_and_fetch_, 8, uint64_t)
/****************************************************************************
* Name: __sync_bool_compare_and_swap_8
****************************************************************************/
SYNC_BOOL_CMP_SWAP(__sync_bool_compare_and_swap_, 8, uint64_t)
/****************************************************************************
* Name: __sync_val_compare_and_swap_8
****************************************************************************/
SYNC_VAL_CMP_SWAP(__sync_val_compare_and_swap_, 8, uint64_t)
#endif /* __clang__ */
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