Help with inline assembly.

[Tervel Atanassov (Anaheim)]

> Dear Helper,
> 
> I am having one hell of a time trying to get some information on how to
> program in the gcc assembly.  Can you please refer me to a nebie guide or
> or something?
> 
> Actually maybe it would be easier if I told you what I want to do.
> In Windows there is a set of API functions which perform atomic "test and
> set"-like operations.  They all start with Interlocked.  For example there
> is an InterlockedIncrement() which takes a long pointer, locks the bus and
> increments the value.  The lock makes the operation atomic over many
> processors.  In Linux, I found a header file called "atomic.h" which has
> similar
> functions which start with the word "atomic".  For example, atomic_inc().
> The problem I have is that these have a void return value, whereas their
> Windows analogies return the modified value.  I am trying to use these
> functions as templates to return the modified value.  So I started with
> the
> function:
> 
> static __inline__ int atomic_inc_and_test(atomic_t *v)
> {
> 	unsigned char c;
> 
> 	__asm__ __volatile__(
> 		LOCK "incl %0; sete %1"
> 		:"=m" (v->counter), "=qm" (c)
> 		:"m" (v->counter) : "memory");
> 	return c != 0;
> }
> 
> However -- as you can see -- this does not return the incremented value,
> but
> the result of a boolean expression.
> 
> Can you please modify the above code for me so that I can incorporate it
> into my code?  Your help is much appreciated.
> 
> Sincerely,
> 
> Tervel Atanassov
>