On Thursday, March 22, 2012 17:31:33 Javier Cardona wrote:

quoted

quoted

 #define SN_GT(x, y) ((long) (y) - (long) (x) < 0)
 #define SN_LT(x, y) ((long) (x) - (long) (y) < 0)

Your macros tried to address the problem but casting your sequence number
to long also breaks the wrap around.

Ah, thanks for your help.  I guess we do need those macros after all
but they'd have to be re-written as

#define SN_LT(x, y) ((s32)(x - y) < 0)
#define SN_GT(x, y) ((s32)(x - y) > 0)

No, you need unsigned values for this arithmetic to work (which is why long 
also fails).

And since this is just to handle wrap arounds, there is no need for
the new SN_EQ that was suggested earlier.

Sounds reasonable to me.

Regards,
Marek