From 70ac26b9e5ca8374bb3ef3f30b871726673c9f27 Mon Sep 17 00:00:00 2001 From: Nicolas Saenz Julienne Date: Mon, 25 Apr 2022 09:57:22 +0200 Subject: util/main-loop: Introduce the main loop into QOM '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= Signed-off-by: Nicolas Saenz Julienne Reviewed-by: Stefan Hajnoczi Acked-by: Markus Armbruster Message-id: 20220425075723.20019-3-nsaenzju@redhat.com Signed-off-by: Stefan Hajnoczi --- util/main-loop.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) (limited to 'util/main-loop.c') diff --git a/util/main-loop.c b/util/main-loop.c index 9afac10dff..e30f034815 100644 --- a/util/main-loop.c +++ b/util/main-loop.c @@ -33,6 +33,7 @@ #include "qemu/error-report.h" #include "qemu/queue.h" #include "qemu/compiler.h" +#include "qom/object.h" #ifndef _WIN32 #include @@ -184,6 +185,61 @@ int qemu_init_main_loop(Error **errp) return 0; } +static void main_loop_update_params(EventLoopBase *base, Error **errp) +{ + if (!qemu_aio_context) { + error_setg(errp, "qemu aio context not ready"); + return; + } + + aio_context_set_aio_params(qemu_aio_context, base->aio_max_batch, errp); +} + +MainLoop *mloop; + +static void main_loop_init(EventLoopBase *base, Error **errp) +{ + MainLoop *m = MAIN_LOOP(base); + + if (mloop) { + error_setg(errp, "only one main-loop instance allowed"); + return; + } + + main_loop_update_params(base, errp); + + mloop = m; + return; +} + +static bool main_loop_can_be_deleted(EventLoopBase *base) +{ + return false; +} + +static void main_loop_class_init(ObjectClass *oc, void *class_data) +{ + EventLoopBaseClass *bc = EVENT_LOOP_BASE_CLASS(oc); + + bc->init = main_loop_init; + bc->update_params = main_loop_update_params; + bc->can_be_deleted = main_loop_can_be_deleted; +} + +static const TypeInfo main_loop_info = { + .name = TYPE_MAIN_LOOP, + .parent = TYPE_EVENT_LOOP_BASE, + .class_init = main_loop_class_init, + .instance_size = sizeof(MainLoop), +}; + +static void main_loop_register_types(void) +{ + type_register_static(&main_loop_info); +} + +type_init(main_loop_register_types) + static int max_priority; #ifndef _WIN32 -- cgit 1.4.1