> extern __inline__ void atomic_add(int i, atomic_t * v)
> {
> unsigned long temp;
>
> __asm__ __volatile__(
> "1: ll %0, %1 # atomic_add\n"
> " addu %0, %2 \n"
> " sc %0, %1 \n"
> " beqz %0, 1b \n"
> : "=&r" (temp), "=m" (v->counter)
> : "Ir" (i), "m" (v->counter));
> }
>
>
> Beginner questions on the above code...
See http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_4.html#SEC93
or any of a number of other on-line copies of the gcc documentation.
Gcc has a very powerful and cool means of binding C variables to
assembly-language operands. The syntax can be painful, but you
can do amazing things with it - in this case, an in-line atomic add
for C.
