[Qemu-devel] Re: [PATCH 01/14] Convert io handlers to QLIST

[Juan Quintela <quintela@redhat.com>]

malc <av1474@comtv.ru> wrote:
> On Wed, 10 Mar 2010, Juan Quintela wrote:
>
>> malc <av1474@comtv.ru> wrote:
>> > On Wed, 10 Mar 2010, Juan Quintela wrote:
>> 
>> >> -        for(ioh = first_io_handler; ioh != NULL; ioh = ioh->next) {
>> >> +        QTAILQ_FOREACH(ioh, &io_handlers, next) {
>> >>              if (ioh->fd == fd)
>> >>                  goto found;
>> >>          }
>> >>          ioh = qemu_mallocz(sizeof(IOHandlerRecord));
>> >> -        ioh->next = first_io_handler;
>> >> -        first_io_handler = ioh;
>> >> +        QTAILQ_INSERT_TAIL(&io_handlers, ioh, next);
>> >
>> > The old code inserted at the head, didn't it?
>> 
>> Sorry, you are right, it shouldn't matter too much, but it is a change.
>
> If it did, why queue instead of list?

Arbitrary.  Example conversion nearer was QTAIL.

Use is:
- insert at the beggining
- search for removal
- loop all list

insert/searchs should be less than loops.  I am more
interested/intrigued if setting more fd's in the select call could
change behaviour.

Changing to QLIST is search/replace, no big deal.

>> 
>> Later, Juan.
>>