Archipelago » qemu

#ifdef __x86_64__

static inline int testandset (int *p)

{

    char ret;

    int readval;

    __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"

                          : "=q" (ret), "=m" (*p), "=a" (readval)

                          : "r" (1), "m" (*p), "a" (0)

                          : "memory");

    return ret;

}

#endif