include/zephyr/sys/atomic_builtin.h

/* atomic operations */

/*
 * Copyright (c) 1997-2015, Wind River Systems, Inc.
 * Copyright (c) 2023 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef ZEPHYR_INCLUDE_SYS_ATOMIC_BUILTIN_H_
#define ZEPHYR_INCLUDE_SYS_ATOMIC_BUILTIN_H_

#include <stdbool.h>
#include <stddef.h>
#include <zephyr/sys/atomic_types.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Included from <atomic.h> */

static inline bool atomic_cas(atomic_t *target, atomic_val_t old_value,
			  atomic_val_t new_value)
{
	return __atomic_compare_exchange_n(target, &old_value, new_value,
					   0, __ATOMIC_SEQ_CST,
					   __ATOMIC_SEQ_CST);
}

static inline bool atomic_ptr_cas(atomic_ptr_t *target, atomic_ptr_val_t old_value,
				  atomic_ptr_val_t new_value)
{
	return __atomic_compare_exchange_n(target, &old_value, new_value,
					   0, __ATOMIC_SEQ_CST,
					   __ATOMIC_SEQ_CST);
}

static inline atomic_val_t atomic_add(atomic_t *target, atomic_val_t value)
{
	return __atomic_fetch_add(target, value, __ATOMIC_SEQ_CST);
}

static inline atomic_val_t atomic_sub(atomic_t *target, atomic_val_t value)
{
	return __atomic_fetch_sub(target, value, __ATOMIC_SEQ_CST);
}

static inline atomic_val_t atomic_inc(atomic_t *target)
{
	return atomic_add(target, 1);
}

static inline atomic_val_t atomic_dec(atomic_t *target)
{
	return atomic_sub(target, 1);
}

static inline atomic_val_t atomic_get(const atomic_t *target)
{
	return __atomic_load_n(target, __ATOMIC_SEQ_CST);
}

static inline atomic_ptr_val_t atomic_ptr_get(const atomic_ptr_t *target)
{
	return __atomic_load_n(target, __ATOMIC_SEQ_CST);
}

static inline atomic_val_t atomic_set(atomic_t *target, atomic_val_t value)
{
	/* This builtin, as described by Intel, is not a traditional
	 * test-and-set operation, but rather an atomic exchange operation. It
	 * writes value into *ptr, and returns the previous contents of *ptr.
	 */
	return __atomic_exchange_n(target, value, __ATOMIC_SEQ_CST);
}

static inline atomic_ptr_val_t atomic_ptr_set(atomic_ptr_t *target, atomic_ptr_val_t value)
{
	return __atomic_exchange_n(target, value, __ATOMIC_SEQ_CST);
}

static inline atomic_val_t atomic_clear(atomic_t *target)
{
	return atomic_set(target, 0);
}

static inline atomic_ptr_val_t atomic_ptr_clear(atomic_ptr_t *target)
{
	return atomic_ptr_set(target, NULL);
}

static inline atomic_val_t atomic_or(atomic_t *target, atomic_val_t value)
{
	return __atomic_fetch_or(target, value, __ATOMIC_SEQ_CST);
}

static inline atomic_val_t atomic_xor(atomic_t *target, atomic_val_t value)
{
	return __atomic_fetch_xor(target, value, __ATOMIC_SEQ_CST);
}

static inline atomic_val_t atomic_and(atomic_t *target, atomic_val_t value)
{
	return __atomic_fetch_and(target, value, __ATOMIC_SEQ_CST);
}

static inline atomic_val_t atomic_nand(atomic_t *target, atomic_val_t value)
{
	return __atomic_fetch_nand(target, value, __ATOMIC_SEQ_CST);
}

#ifdef __cplusplus
}
#endif

#endif /* ZEPHYR_INCLUDE_SYS_ATOMIC_BUILTIN_H_ */