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/**
* This file is under no copyright claims due to its
* simplicity.
*/
#ifndef _WSBM_ATOMIC_H_
#define _WSBM_ATOMIC_H_
#include <stdint.h>
struct _WsbmAtomic {
int32_t count;
};
#define wsbmAtomicInit(_i) {(i)}
#define wsbmAtomicSet(_v, _i) (((_v)->count) = (_i))
#define wsbmAtomicRead(_v) ((_v)->count)
static inline int
wsbmAtomicIncZero(struct _WsbmAtomic *v)
{
unsigned char c;
__asm__ __volatile__(
"lock; incl %0; sete %1"
:"+m" (v->count), "=qm" (c)
: : "memory");
return c != 0;
}
static inline int
wsbmAtomicDecNegative(struct _WsbmAtomic *v)
{
unsigned char c;
int i = -1;
__asm__ __volatile__(
"lock; addl %2,%0; sets %1"
:"+m" (v->count), "=qm" (c)
:"ir" (i) : "memory");
return c;
}
static inline int
wsbmAtomicDecZero(struct _WsbmAtomic *v)
{
unsigned char c;
__asm__ __volatile__(
"lock; decl %0; sete %1"
:"+m" (v->count), "=qm" (c)
: : "memory");
return c != 0;
}
static inline void wsbmAtomicInc(struct _WsbmAtomic *v)
{
__asm__ __volatile__(
"lock; incl %0"
:"+m" (v->count));
}
static inline void wsbmAtomicDec(struct _WsbmAtomic *v)
{
__asm__ __volatile__(
"lock; decl %0"
:"+m" (v->count));
}
static inline int32_t wsbmAtomicCmpXchg(volatile struct _WsbmAtomic *v, int32_t old,
int32_t new)
{
int32_t previous;
__asm__ __volatile__(
"lock; cmpxchgl %k1,%2"
: "=a" (previous)
: "r" (new), "m" (v->count), "0" (old)
: "memory");
return previous;
}
#endif
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