On Thu, Mar 12, 2009 at 11:58 AM, Nelson Castillo <nelsoneci@xxxxxxxxx> wrote: > On Thu, Mar 12, 2009 at 2:06 PM, Sukanto Ghosh > <sukanto.cse.iitb@xxxxxxxxx> wrote: >> Hi, >> >> The complete definition of structure cfs_rq is in a .c file >> (kernel/sched.c). In the head linux/sched.h it has been declared as >> "struct cfs_rq;" >> What is the purpose of doing so ? > > With this declaration in linux/sched.h you can make pointers of the > structure anywhere. All pointers have the same size thus it just > doesn't matter if you don't know the details of the structure. > > The idea of not exposing the structure is just encapsulation. It means > you shouldn't be touching those fields outside kernel/sched.c unless > you use one of the provided API functions to do so (if any). > exactly, and yet the fields have been used in kernel/sched_fair.c .... this is what confuses me -- Regards, Sukanto Ghosh -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
