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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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10
include/qemu/main-loop.h
View file

@ -26,9 +26,19 @@
#define QEMU_MAIN_LOOP_H
#include "block/aio.h"
#include "qom/object.h"
#include "sysemu/event-loop-base.h"
#define SIG_IPI SIGUSR1
#define TYPE_MAIN_LOOP "main-loop"
OBJECT_DECLARE_TYPE(MainLoop, MainLoopClass, MAIN_LOOP)
struct MainLoop {
EventLoopBase parent_obj;
};
typedef struct MainLoop MainLoop;
/**
* qemu_init_main_loop: Set up the process so that it can run the main loop.
*