#ifndef _ELIBC_ATOMIC_ARCH_H
#define _ELIBC_ATOMIC_ARCH_H

/* x86_64: minimal atomic ops via locked cmpxchg (CPU-local, no syscall) */

static inline int a_cas(volatile int *p, int t, int s)
{
    int old;
    __asm__ volatile ("lock; cmpxchg %3, %1"
        : "=a"(old), "=m"(*p)
        : "a"(t), "r"(s), "m"(*p)
        : "memory");
    return old;
}

static inline void a_inc(volatile int *p)
{
    __asm__ volatile ("lock; incl %0" : "=m"(*p) : "m"(*p) : "memory");
}

static inline void a_dec(volatile int *p)
{
    __asm__ volatile ("lock; decl %0" : "=m"(*p) : "m"(*p) : "memory");
}

#endif