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/* Copyright (c) 2013, Linaro Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/**
* @file
*
* ODP atomic operations
*/
#ifndef ODP_ATOMIC_H_
#define ODP_ATOMIC_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <stdint.h>
#include <odp_align.h>
/** @addtogroup odp_synchronizers
* Atomic types and relaxed operations. These operations cannot be used for
* synchronization.
* @{
*/
/**
* Atomic 64-bit unsigned integer
*/
typedef struct {
uint64_t v; /**< Actual storage for the atomic variable */
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
/* Some architectures do not support lock-free operations on 64-bit
* data types. We use a spin lock to ensure atomicity. */
char lock; /**< Spin lock (if needed) used to ensure atomic access */
#endif
} odp_atomic_u64_t
ODP_ALIGNED(sizeof(uint64_t)); /* Enforce alignement! */
/**
* Atomic 32-bit unsigned integer
*/
typedef struct {
uint32_t v; /**< Actual storage for the atomic variable */
} odp_atomic_u32_t
ODP_ALIGNED(sizeof(uint32_t)); /* Enforce alignement! */
/**
* Initialize atomic uint32 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[out] atom Pointer to an atomic uint32 variable
* @param val Value to initialize the variable with
*/
static inline void odp_atomic_init_u32(odp_atomic_u32_t *atom, uint32_t val)
{
__atomic_store_n(&atom->v, val, __ATOMIC_RELAXED);
}
/**
* Load value of atomic uint32 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param atom Pointer to an atomic uint32 variable
*
* @return Value of the variable
*/
static inline uint32_t odp_atomic_load_u32(odp_atomic_u32_t *atom)
{
return __atomic_load_n(&atom->v, __ATOMIC_RELAXED);
}
/**
* Store value to atomic uint32 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[out] atom Pointer to an atomic uint32 variable
* @param val Value to store in the variable
*/
static inline void odp_atomic_store_u32(odp_atomic_u32_t *atom,
uint32_t val)
{
__atomic_store_n(&atom->v, val, __ATOMIC_RELAXED);
}
/**
* Fetch and add to atomic uint32 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint32 variable
* @param val Value to be added to the variable
*
* @return Value of the variable before the addition
*/
static inline uint32_t odp_atomic_fetch_add_u32(odp_atomic_u32_t *atom,
uint32_t val)
{
return __atomic_fetch_add(&atom->v, val, __ATOMIC_RELAXED);
}
/**
* Add to atomic uint32 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint32 variable
* @param val A value to be added to the variable
*/
static inline void odp_atomic_add_u32(odp_atomic_u32_t *atom,
uint32_t val)
{
(void)__atomic_fetch_add(&atom->v, val, __ATOMIC_RELAXED);
}
/**
* Fetch and subtract from atomic uint32 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint32 variable
* @param val A value to be subracted from the variable
*
* @return Value of the variable before the subtraction
*/
static inline uint32_t odp_atomic_fetch_sub_u32(odp_atomic_u32_t *atom,
uint32_t val)
{
return __atomic_fetch_sub(&atom->v, val, __ATOMIC_RELAXED);
}
/**
* Subtract from atomic uint32 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint32 variable
* @param val Value to be subtracted from the variable
*/
static inline void odp_atomic_sub_u32(odp_atomic_u32_t *atom,
uint32_t val)
{
(void)__atomic_fetch_sub(&atom->v, val, __ATOMIC_RELAXED);
}
/**
* Fetch and increment atomic uint32 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint32 variable
*
* @return Value of the variable before the increment
*/
static inline uint32_t odp_atomic_fetch_inc_u32(odp_atomic_u32_t *atom)
{
return __atomic_fetch_add(&atom->v, 1, __ATOMIC_RELAXED);
}
/**
* Increment atomic uint32 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint32 variable
*/
static inline void odp_atomic_inc_u32(odp_atomic_u32_t *atom)
{
(void)__atomic_fetch_add(&atom->v, 1, __ATOMIC_RELAXED);
}
/**
* Fetch and decrement atomic uint32 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint32 variable
*
* @return Value of the variable before the subtraction
*/
static inline uint32_t odp_atomic_fetch_dec_u32(odp_atomic_u32_t *atom)
{
return __atomic_fetch_sub(&atom->v, 1, __ATOMIC_RELAXED);
}
/**
* Decrement atomic uint32 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint32 variable
*/
static inline void odp_atomic_dec_u32(odp_atomic_u32_t *atom)
{
(void)__atomic_fetch_sub(&atom->v, 1, __ATOMIC_RELAXED);
}
/**
* Initialize atomic uint64 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[out] atom Pointer to an atomic uint64 variable
* @param val Value to initialize the variable with
*/
static inline void odp_atomic_init_u64(odp_atomic_u64_t *atom, uint64_t val)
{
atom->v = val;
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
__atomic_clear(&atom->lock, __ATOMIC_RELAXED);
#endif
}
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
/**
* @internal
* Helper macro for lock-based atomic operations on 64-bit integers
* @param[in,out] atom Pointer to the 64-bit atomic variable
* @param expr Expression used update the variable.
* @return The old value of the variable.
*/
#define ATOMIC_OP(atom, expr) \
({ \
uint64_t old_val; \
/* Loop while lock is already taken, stop when lock becomes clear */ \
while (__atomic_test_and_set(&(atom)->lock, __ATOMIC_ACQUIRE)) \
(void)0; \
old_val = (atom)->v; \
(expr); /* Perform whatever update is desired */ \
__atomic_clear(&(atom)->lock, __ATOMIC_RELEASE); \
old_val; /* Return old value */ \
})
#endif
/**
* Load value of atomic uint64 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param atom Pointer to an atomic uint64 variable
*
* @return Value of the variable
*/
static inline uint64_t odp_atomic_load_u64(odp_atomic_u64_t *atom)
{
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
return ATOMIC_OP(atom, (void)0);
#else
return __atomic_load_n(&atom->v, __ATOMIC_RELAXED);
#endif
}
/**
* Store value to atomic uint64 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[out] atom Pointer to an atomic uint64 variable
* @param val Value to store in the variable
*/
static inline void odp_atomic_store_u64(odp_atomic_u64_t *atom,
uint64_t val)
{
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
(void)ATOMIC_OP(atom, atom->v = val);
#else
__atomic_store_n(&atom->v, val, __ATOMIC_RELAXED);
#endif
}
/**
* Fetch and add to atomic uint64 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint64 variable
* @param val Value to be added to the variable
*
* @return Value of the variable before the addition
*/
static inline uint64_t odp_atomic_fetch_add_u64(odp_atomic_u64_t *atom,
uint64_t val)
{
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
return ATOMIC_OP(atom, atom->v += val);
#else
return __atomic_fetch_add(&atom->v, val, __ATOMIC_RELAXED);
#endif
}
/**
* Add to atomic uint64 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint64 variable
* @param val Value to be added to the variable
*
*/
static inline void odp_atomic_add_u64(odp_atomic_u64_t *atom, uint64_t val)
{
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
(void)ATOMIC_OP(atom, atom->v += val);
#else
(void)__atomic_fetch_add(&atom->v, val, __ATOMIC_RELAXED);
#endif
}
/**
* Fetch and subtract from atomic uint64 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint64 variable
* @param val Value to be subtracted from the variable
*
* @return Value of the variable before the subtraction
*/
static inline uint64_t odp_atomic_fetch_sub_u64(odp_atomic_u64_t *atom,
uint64_t val)
{
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
return ATOMIC_OP(atom, atom->v -= val);
#else
return __atomic_fetch_sub(&atom->v, val, __ATOMIC_RELAXED);
#endif
}
/**
* Subtract from atomic uint64 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint64 variable
* @param val Value to be subtracted from the variable
*/
static inline void odp_atomic_sub_u64(odp_atomic_u64_t *atom, uint64_t val)
{
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
(void)ATOMIC_OP(atom, atom->v -= val);
#else
(void)__atomic_fetch_sub(&atom->v, val, __ATOMIC_RELAXED);
#endif
}
/**
* Fetch and increment atomic uint64 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint64 variable
*
* @return Value of the variable before the increment
*/
static inline uint64_t odp_atomic_fetch_inc_u64(odp_atomic_u64_t *atom)
{
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
return ATOMIC_OP(atom, atom->v++);
#else
return __atomic_fetch_add(&atom->v, 1, __ATOMIC_RELAXED);
#endif
}
/**
* Increment atomic uint64 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint64 variable
*/
static inline void odp_atomic_inc_u64(odp_atomic_u64_t *atom)
{
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
(void)ATOMIC_OP(atom, atom->v++);
#else
(void)__atomic_fetch_add(&atom->v, 1, __ATOMIC_RELAXED);
#endif
}
/**
* Fetch and decrement atomic uint64 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint64 variable
*
* @return Value of the variable before the decrement
*/
static inline uint64_t odp_atomic_fetch_dec_u64(odp_atomic_u64_t *atom)
{
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
return ATOMIC_OP(atom, atom->v--);
#else
return __atomic_fetch_sub(&atom->v, 1, __ATOMIC_RELAXED);
#endif
}
/**
* Decrement atomic uint64 variable
* @note Relaxed memory order, cannot be used for synchronization
*
* @param[in,out] atom Pointer to an atomic uint64 variable
*/
static inline void odp_atomic_dec_u64(odp_atomic_u64_t *atom)
{
#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
(void)ATOMIC_OP(atom, atom->v--);
#else
(void)__atomic_fetch_sub(&atom->v, 1, __ATOMIC_RELAXED);
#endif
}
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif
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