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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 <odp_std_types.h>
/** @addtogroup odp_synchronizers
* Atomic operations.
* @{
*/
/**
* Atomic unsigned integer 64 bits
*/
typedef volatile uint64_t odp_atomic_u64_t;
/**
* Atomic unsigned integer 32 bits
*/
typedef volatile uint32_t odp_atomic_u32_t;
/**
* Initialize atomic uint32
*
* @param ptr An atomic variable
*
* @note The operation is not synchronized with other threads
*/
static inline void odp_atomic_init_u32(odp_atomic_u32_t *ptr)
{
*ptr = 0;
}
/**
* Load value of atomic uint32
*
* @param ptr An atomic variable
*
* @return atomic uint32 value
*
* @note The operation is not synchronized with other threads
*/
static inline uint32_t odp_atomic_load_u32(odp_atomic_u32_t *ptr)
{
return *ptr;
}
/**
* Store value to atomic uint32
*
* @param ptr An atomic variable
* @param new_value Store new_value to a variable
*
* @note The operation is not synchronized with other threads
*/
static inline void odp_atomic_store_u32(odp_atomic_u32_t *ptr,
uint32_t new_value)
{
*ptr = new_value;
}
/**
* Fetch and add atomic uint32
*
* @param ptr An atomic variable
* @param value A value to be added to the variable
*
* @return Value of the variable before the operation
*/
static inline uint32_t odp_atomic_fetch_add_u32(odp_atomic_u32_t *ptr,
uint32_t value)
{
return __sync_fetch_and_add(ptr, value);
}
/**
* Fetch and subtract uint32
*
* @param ptr An atomic variable
* @param value A value to be sub to the variable
*
* @return Value of the variable before the operation
*/
static inline uint32_t odp_atomic_fetch_sub_u32(odp_atomic_u32_t *ptr,
uint32_t value)
{
return __sync_fetch_and_sub(ptr, value);
}
/**
* Fetch and increment atomic uint32 by 1
*
* @param ptr An atomic variable
*
* @return Value of the variable before the operation
*/
#if defined __OCTEON__
static inline uint32_t odp_atomic_fetch_inc_u32(odp_atomic_u32_t *ptr)
{
uint32_t ret;
__asm__ __volatile__ ("syncws");
__asm__ __volatile__ ("lai %0,(%2)" : "=r" (ret), "+m" (ptr) :
"r" (ptr));
return ret;
}
#else
static inline uint32_t odp_atomic_fetch_inc_u32(odp_atomic_u32_t *ptr)
{
return odp_atomic_fetch_add_u32(ptr, 1);
}
#endif
/**
* Increment atomic uint32 by 1
*
* @param ptr An atomic variable
*
*/
static inline void odp_atomic_inc_u32(odp_atomic_u32_t *ptr)
{
odp_atomic_fetch_add_u32(ptr, 1);
}
/**
* Fetch and decrement uint32 by 1
*
* @param ptr An atomic variable
*
* @return Value of the variable before the operation
*/
static inline uint32_t odp_atomic_fetch_dec_u32(odp_atomic_u32_t *ptr)
{
return odp_atomic_fetch_sub_u32(ptr, 1);
}
/**
* Decrement atomic uint32 by 1
*
* @param ptr An atomic variable
*
*/
static inline void odp_atomic_dec_u32(odp_atomic_u32_t *ptr)
{
odp_atomic_fetch_sub_u32(ptr, 1);
}
/**
* Atomic compare and set for 32bit
*
* @param dst destination location into which the value will be written.
* @param exp expected value.
* @param src new value.
* @return Non-zero on success; 0 on failure.
*/
static inline int
odp_atomic_cmpset_u32(odp_atomic_u32_t *dst, uint32_t exp, uint32_t src)
{
return __sync_bool_compare_and_swap(dst, exp, src);
}
/**
* Initialize atomic uint64
*
* @param ptr An atomic variable
*
* @note The operation is not synchronized with other threads
*/
static inline void odp_atomic_init_u64(odp_atomic_u64_t *ptr)
{
*ptr = 0;
}
/**
* Load value of atomic uint64
*
* @param ptr An atomic variable
*
* @return atomic uint64 value
*
* @note The operation is not synchronized with other threads
*/
static inline uint64_t odp_atomic_load_u64(odp_atomic_u64_t *ptr)
{
return *ptr;
}
/**
* Store value to atomic uint64
*
* @param ptr An atomic variable
* @param new_value Store new_value to a variable
*
* @note The operation is not synchronized with other threads
*/
static inline void odp_atomic_store_u64(odp_atomic_u64_t *ptr,
uint64_t new_value)
{
*ptr = new_value;
}
/**
* Add atomic uint64
*
* @param ptr An atomic variable
* @param value A value to be added to the variable
*
*/
static inline void odp_atomic_add_u64(odp_atomic_u64_t *ptr, uint64_t value)
{
__sync_fetch_and_add(ptr, value);
}
/**
* Fetch and add atomic uint64
*
* @param ptr An atomic variable
* @param value A value to be added to the variable
*
* @return Value of the variable before the operation
*/
#if defined __powerpc__ && !defined __powerpc64__
static inline uint64_t odp_atomic_fetch_add_u64(odp_atomic_u64_t *ptr,
uint64_t value)
{
return __sync_fetch_and_add((odp_atomic_u32_t *)ptr,
(uint32_t)value);
}
#else
static inline uint64_t odp_atomic_fetch_add_u64(odp_atomic_u64_t *ptr,
uint64_t value)
{
return __sync_fetch_and_add(ptr, value);
}
#endif
/**
* Subtract atomic uint64
*
* @param ptr An atomic variable
* @param value A value to be subtracted from the variable
*
*/
static inline void odp_atomic_sub_u64(odp_atomic_u64_t *ptr, uint64_t value)
{
__sync_fetch_and_sub(ptr, value);
}
/**
* Fetch and subtract atomic uint64
*
* @param ptr An atomic variable
* @param value A value to be subtracted from the variable
*
* @return Value of the variable before the operation
*/
#if defined __powerpc__ && !defined __powerpc64__
static inline uint64_t odp_atomic_fetch_sub_u64(odp_atomic_u64_t *ptr,
uint64_t value)
{
return __sync_fetch_and_sub((odp_atomic_u32_t *)ptr,
(uint32_t)value);
}
#else
static inline uint64_t odp_atomic_fetch_sub_u64(odp_atomic_u64_t *ptr,
uint64_t value)
{
return __sync_fetch_and_sub(ptr, value);
}
#endif
/**
* Fetch and increment atomic uint64 by 1
*
* @param ptr An atomic variable
*
* @return Value of the variable before the operation
*/
static inline uint64_t odp_atomic_fetch_inc_u64(odp_atomic_u64_t *ptr)
{
return odp_atomic_fetch_add_u64(ptr, 1);
}
/**
* Increment atomic uint64 by 1
*
* @param ptr An atomic variable
*
*/
static inline void odp_atomic_inc_u64(odp_atomic_u64_t *ptr)
{
odp_atomic_fetch_add_u64(ptr, 1);
}
/**
* Fetch and decrement atomic uint64 by 1
*
* @param ptr An atomic variable
*
* @return Value of the variable before the operation
*/
static inline uint64_t odp_atomic_fetch_dec_u64(odp_atomic_u64_t *ptr)
{
return odp_atomic_fetch_sub_u64(ptr, 1);
}
/**
* Decrement atomic uint64 by 1
*
* @param ptr An atomic variable
*
*/
static inline void odp_atomic_dec_u64(odp_atomic_u64_t *ptr)
{
odp_atomic_fetch_sub_u64(ptr, 1);
}
/**
* Atomic compare and set for 64bit
*
* @param dst destination location into which the value will be written.
* @param exp expected value.
* @param src new value.
* @return Non-zero on success; 0 on failure.
*/
static inline int
odp_atomic_cmpset_u64(odp_atomic_u64_t *dst, uint64_t exp, uint64_t src)
{
return __sync_bool_compare_and_swap(dst, exp, src);
}
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif
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