| /* |
| * Event loop thread |
| * |
| * Copyright Red Hat Inc., 2013 |
| * |
| * Authors: |
| * Stefan Hajnoczi <stefanha@redhat.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| * See the COPYING file in the top-level directory. |
| * |
| */ |
| |
| #include "qom/object.h" |
| #include "qom/object_interfaces.h" |
| #include "qemu/module.h" |
| #include "block/aio.h" |
| #include "sysemu/iothread.h" |
| #include "qmp-commands.h" |
| |
| #define IOTHREADS_PATH "/objects" |
| |
| typedef ObjectClass IOThreadClass; |
| |
| #define IOTHREAD_GET_CLASS(obj) \ |
| OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD) |
| #define IOTHREAD_CLASS(klass) \ |
| OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD) |
| |
| static void *iothread_run(void *opaque) |
| { |
| IOThread *iothread = opaque; |
| |
| qemu_mutex_lock(&iothread->init_done_lock); |
| iothread->thread_id = qemu_get_thread_id(); |
| qemu_cond_signal(&iothread->init_done_cond); |
| qemu_mutex_unlock(&iothread->init_done_lock); |
| |
| while (!iothread->stopping) { |
| aio_context_acquire(iothread->ctx); |
| while (!iothread->stopping && aio_poll(iothread->ctx, true)) { |
| /* Progress was made, keep going */ |
| } |
| aio_context_release(iothread->ctx); |
| } |
| return NULL; |
| } |
| |
| static void iothread_instance_finalize(Object *obj) |
| { |
| IOThread *iothread = IOTHREAD(obj); |
| |
| iothread->stopping = true; |
| aio_notify(iothread->ctx); |
| qemu_thread_join(&iothread->thread); |
| qemu_cond_destroy(&iothread->init_done_cond); |
| qemu_mutex_destroy(&iothread->init_done_lock); |
| aio_context_unref(iothread->ctx); |
| } |
| |
| static void iothread_complete(UserCreatable *obj, Error **errp) |
| { |
| IOThread *iothread = IOTHREAD(obj); |
| |
| iothread->stopping = false; |
| iothread->ctx = aio_context_new(); |
| iothread->thread_id = -1; |
| |
| qemu_mutex_init(&iothread->init_done_lock); |
| qemu_cond_init(&iothread->init_done_cond); |
| |
| /* This assumes we are called from a thread with useful CPU affinity for us |
| * to inherit. |
| */ |
| qemu_thread_create(&iothread->thread, "iothread", iothread_run, |
| iothread, QEMU_THREAD_JOINABLE); |
| |
| /* Wait for initialization to complete */ |
| qemu_mutex_lock(&iothread->init_done_lock); |
| while (iothread->thread_id == -1) { |
| qemu_cond_wait(&iothread->init_done_cond, |
| &iothread->init_done_lock); |
| } |
| qemu_mutex_unlock(&iothread->init_done_lock); |
| } |
| |
| static void iothread_class_init(ObjectClass *klass, void *class_data) |
| { |
| UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass); |
| ucc->complete = iothread_complete; |
| } |
| |
| static const TypeInfo iothread_info = { |
| .name = TYPE_IOTHREAD, |
| .parent = TYPE_OBJECT, |
| .class_init = iothread_class_init, |
| .instance_size = sizeof(IOThread), |
| .instance_finalize = iothread_instance_finalize, |
| .interfaces = (InterfaceInfo[]) { |
| {TYPE_USER_CREATABLE}, |
| {} |
| }, |
| }; |
| |
| static void iothread_register_types(void) |
| { |
| type_register_static(&iothread_info); |
| } |
| |
| type_init(iothread_register_types) |
| |
| IOThread *iothread_find(const char *id) |
| { |
| Object *container = container_get(object_get_root(), IOTHREADS_PATH); |
| Object *child; |
| |
| child = object_property_get_link(container, id, NULL); |
| if (!child) { |
| return NULL; |
| } |
| return (IOThread *)object_dynamic_cast(child, TYPE_IOTHREAD); |
| } |
| |
| char *iothread_get_id(IOThread *iothread) |
| { |
| return object_get_canonical_path_component(OBJECT(iothread)); |
| } |
| |
| AioContext *iothread_get_aio_context(IOThread *iothread) |
| { |
| return iothread->ctx; |
| } |
| |
| static int query_one_iothread(Object *object, void *opaque) |
| { |
| IOThreadInfoList ***prev = opaque; |
| IOThreadInfoList *elem; |
| IOThreadInfo *info; |
| IOThread *iothread; |
| |
| iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); |
| if (!iothread) { |
| return 0; |
| } |
| |
| info = g_new0(IOThreadInfo, 1); |
| info->id = iothread_get_id(iothread); |
| info->thread_id = iothread->thread_id; |
| |
| elem = g_new0(IOThreadInfoList, 1); |
| elem->value = info; |
| elem->next = NULL; |
| |
| **prev = elem; |
| *prev = &elem->next; |
| return 0; |
| } |
| |
| IOThreadInfoList *qmp_query_iothreads(Error **errp) |
| { |
| IOThreadInfoList *head = NULL; |
| IOThreadInfoList **prev = &head; |
| Object *container = container_get(object_get_root(), IOTHREADS_PATH); |
| |
| object_child_foreach(container, query_one_iothread, &prev); |
| return head; |
| } |