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util/main-loop: Introduce the main loop into QOM

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'event-loop-base' provides basic property handling for all 'AioContext'
based event loops. So let's define a new 'MainLoopClass' that inherits
from it. This will permit tweaking the main loop's properties through
qapi as well as through the command line using the '-object' keyword[1].
Only one instance of 'MainLoopClass' might be created at any time.

'EventLoopBaseClass' learns a new callback, 'can_be_deleted()' so as to
mark 'MainLoop' as non-deletable.

[1] For example:
      -object main-loop,id=main-loop,aio-max-batch=<value>

Signed-off-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-id: 20220425075723.20019-3-nsaenzju@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Nicolas Saenz Julienne
2022-04-25 09:57:22 +02:00
committed by Stefan Hajnoczi
parent 7d5983e3c8
commit 70ac26b9e5
6 changed files with 95 additions and 1 deletions
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13
event-loop-base.c
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@@ -73,10 +73,23 @@ static void event_loop_base_complete(UserCreatable *uc, Error **errp)
}
}
static bool event_loop_base_can_be_deleted(UserCreatable *uc)
{
EventLoopBaseClass *bc = EVENT_LOOP_BASE_GET_CLASS(uc);
EventLoopBase *backend = EVENT_LOOP_BASE(uc);
if (bc->can_be_deleted) {
return bc->can_be_deleted(backend);
}
return true;
}
static void event_loop_base_class_init(ObjectClass *klass, void *class_data)
{
UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass);
ucc->complete = event_loop_base_complete;
ucc->can_be_deleted = event_loop_base_can_be_deleted;
object_class_property_add(klass, "aio-max-batch", "int",
event_loop_base_get_param,