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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __TOOLS_ASM_GENERIC_ATOMIC_H
#define __TOOLS_ASM_GENERIC_ATOMIC_H
#include <linux/compiler.h>
#include <linux/types.h>
/*
* Atomic operations that C can't guarantee us. Useful for
* resource counting etc..
*
* Excerpts obtained from the Linux kernel sources.
*/
#define ATOMIC_INIT(i) { (i) }
/**
* atomic_read - read atomic variable
* @v: pointer of type atomic_t
*
* Atomically reads the value of @v.
*/
static inline int atomic_read(const atomic_t *v)
{
return ACCESS_ONCE((v)->counter);
}
/**
* atomic_set - set atomic variable
* @v: pointer of type atomic_t
* @i: required value
*
* Atomically sets the value of @v to @i.
*/
static inline void atomic_set(atomic_t *v, int i)
{
v->counter = i;
}
/**
* atomic_inc - increment atomic variable
* @v: pointer of type atomic_t
*
* Atomically increments @v by 1.
*/
static inline void atomic_inc(atomic_t *v)
{
__sync_add_and_fetch(&v->counter, 1);
}
/**
* atomic_dec_and_test - decrement and test
* @v: pointer of type atomic_t
*
* Atomically decrements @v by 1 and
* returns true if the result is 0, or false for all other
* cases.
*/
static inline int atomic_dec_and_test(atomic_t *v)
{
return __sync_sub_and_fetch(&v->counter, 1) == 0;
}
#define cmpxchg(ptr, oldval, newval) \
__sync_val_compare_and_swap(ptr, oldval, newval)
static inline int atomic_cmpxchg(atomic_t *v, int oldval, int newval)
{
return cmpxchg(&(v)->counter, oldval, newval);
}
#endif /* __TOOLS_ASM_GENERIC_ATOMIC_H */
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