1be8d8537SStefan Hajnoczi /* 2be8d8537SStefan Hajnoczi * Event loop thread 3be8d8537SStefan Hajnoczi * 4be8d8537SStefan Hajnoczi * Copyright Red Hat Inc., 2013 5be8d8537SStefan Hajnoczi * 6be8d8537SStefan Hajnoczi * Authors: 7be8d8537SStefan Hajnoczi * Stefan Hajnoczi <stefanha@redhat.com> 8be8d8537SStefan Hajnoczi * 9be8d8537SStefan Hajnoczi * This work is licensed under the terms of the GNU GPL, version 2 or later. 10be8d8537SStefan Hajnoczi * See the COPYING file in the top-level directory. 11be8d8537SStefan Hajnoczi * 12be8d8537SStefan Hajnoczi */ 13be8d8537SStefan Hajnoczi 14d38ea87aSPeter Maydell #include "qemu/osdep.h" 15be8d8537SStefan Hajnoczi #include "qom/object.h" 16be8d8537SStefan Hajnoczi #include "qom/object_interfaces.h" 17be8d8537SStefan Hajnoczi #include "qemu/module.h" 18be8d8537SStefan Hajnoczi #include "block/aio.h" 19d16341faSPaolo Bonzini #include "block/block.h" 20be8d8537SStefan Hajnoczi #include "sysemu/iothread.h" 21dc3dd0d2SStefan Hajnoczi #include "qmp-commands.h" 222f78e491SChrysostomos Nanakos #include "qemu/error-report.h" 23ab28bd23SPaolo Bonzini #include "qemu/rcu.h" 24e4370165SPaolo Bonzini #include "qemu/main-loop.h" 25be8d8537SStefan Hajnoczi 26be8d8537SStefan Hajnoczi typedef ObjectClass IOThreadClass; 27be8d8537SStefan Hajnoczi 28be8d8537SStefan Hajnoczi #define IOTHREAD_GET_CLASS(obj) \ 29be8d8537SStefan Hajnoczi OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD) 30be8d8537SStefan Hajnoczi #define IOTHREAD_CLASS(klass) \ 31be8d8537SStefan Hajnoczi OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD) 32be8d8537SStefan Hajnoczi 33cdd7abfdSStefan Hajnoczi /* Benchmark results from 2016 on NVMe SSD drives show max polling times around 34cdd7abfdSStefan Hajnoczi * 16-32 microseconds yield IOPS improvements for both iodepth=1 and iodepth=32 35cdd7abfdSStefan Hajnoczi * workloads. 36cdd7abfdSStefan Hajnoczi */ 37cdd7abfdSStefan Hajnoczi #define IOTHREAD_POLL_MAX_NS_DEFAULT 32768ULL 38cdd7abfdSStefan Hajnoczi 39e4370165SPaolo Bonzini static __thread IOThread *my_iothread; 40e4370165SPaolo Bonzini 41e4370165SPaolo Bonzini AioContext *qemu_get_current_aio_context(void) 42e4370165SPaolo Bonzini { 43e4370165SPaolo Bonzini return my_iothread ? my_iothread->ctx : qemu_get_aio_context(); 44e4370165SPaolo Bonzini } 45e4370165SPaolo Bonzini 46be8d8537SStefan Hajnoczi static void *iothread_run(void *opaque) 47be8d8537SStefan Hajnoczi { 48be8d8537SStefan Hajnoczi IOThread *iothread = opaque; 49be8d8537SStefan Hajnoczi 50ab28bd23SPaolo Bonzini rcu_register_thread(); 51ab28bd23SPaolo Bonzini 52e4370165SPaolo Bonzini my_iothread = iothread; 5388eb7c29SStefan Hajnoczi qemu_mutex_lock(&iothread->init_done_lock); 5488eb7c29SStefan Hajnoczi iothread->thread_id = qemu_get_thread_id(); 5588eb7c29SStefan Hajnoczi qemu_cond_signal(&iothread->init_done_cond); 5688eb7c29SStefan Hajnoczi qemu_mutex_unlock(&iothread->init_done_lock); 5788eb7c29SStefan Hajnoczi 5865c1b5b6SPaolo Bonzini while (!atomic_read(&iothread->stopping)) { 5965c1b5b6SPaolo Bonzini aio_poll(iothread->ctx, true); 60329163cbSWang Yong 61329163cbSWang Yong if (atomic_read(&iothread->worker_context)) { 62329163cbSWang Yong GMainLoop *loop; 63329163cbSWang Yong 64329163cbSWang Yong g_main_context_push_thread_default(iothread->worker_context); 65329163cbSWang Yong iothread->main_loop = 66329163cbSWang Yong g_main_loop_new(iothread->worker_context, TRUE); 67329163cbSWang Yong loop = iothread->main_loop; 68329163cbSWang Yong 69329163cbSWang Yong g_main_loop_run(iothread->main_loop); 70329163cbSWang Yong iothread->main_loop = NULL; 71329163cbSWang Yong g_main_loop_unref(loop); 72329163cbSWang Yong 73329163cbSWang Yong g_main_context_pop_thread_default(iothread->worker_context); 74329163cbSWang Yong g_main_context_unref(iothread->worker_context); 75329163cbSWang Yong iothread->worker_context = NULL; 76329163cbSWang Yong } 77be8d8537SStefan Hajnoczi } 78ab28bd23SPaolo Bonzini 79ab28bd23SPaolo Bonzini rcu_unregister_thread(); 80be8d8537SStefan Hajnoczi return NULL; 81be8d8537SStefan Hajnoczi } 82be8d8537SStefan Hajnoczi 83*82d90705SPeter Xu void iothread_stop(IOThread *iothread) 84be8d8537SStefan Hajnoczi { 85*82d90705SPeter Xu if (!iothread->ctx || iothread->stopping) { 86*82d90705SPeter Xu return; 872f78e491SChrysostomos Nanakos } 88be8d8537SStefan Hajnoczi iothread->stopping = true; 89be8d8537SStefan Hajnoczi aio_notify(iothread->ctx); 90329163cbSWang Yong if (atomic_read(&iothread->main_loop)) { 91329163cbSWang Yong g_main_loop_quit(iothread->main_loop); 92329163cbSWang Yong } 93be8d8537SStefan Hajnoczi qemu_thread_join(&iothread->thread); 94*82d90705SPeter Xu } 95*82d90705SPeter Xu 96*82d90705SPeter Xu static int iothread_stop_iter(Object *object, void *opaque) 97*82d90705SPeter Xu { 98*82d90705SPeter Xu IOThread *iothread; 99*82d90705SPeter Xu 100*82d90705SPeter Xu iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); 101*82d90705SPeter Xu if (!iothread) { 102*82d90705SPeter Xu return 0; 103*82d90705SPeter Xu } 104*82d90705SPeter Xu iothread_stop(iothread); 105dce8921bSFam Zheng return 0; 106dce8921bSFam Zheng } 107dce8921bSFam Zheng 108cdd7abfdSStefan Hajnoczi static void iothread_instance_init(Object *obj) 109cdd7abfdSStefan Hajnoczi { 110cdd7abfdSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 111cdd7abfdSStefan Hajnoczi 112cdd7abfdSStefan Hajnoczi iothread->poll_max_ns = IOTHREAD_POLL_MAX_NS_DEFAULT; 113cdd7abfdSStefan Hajnoczi } 114cdd7abfdSStefan Hajnoczi 115dce8921bSFam Zheng static void iothread_instance_finalize(Object *obj) 116dce8921bSFam Zheng { 117dce8921bSFam Zheng IOThread *iothread = IOTHREAD(obj); 118dce8921bSFam Zheng 119*82d90705SPeter Xu iothread_stop(iothread); 12088eb7c29SStefan Hajnoczi qemu_cond_destroy(&iothread->init_done_cond); 12188eb7c29SStefan Hajnoczi qemu_mutex_destroy(&iothread->init_done_lock); 122eb7b5c35SLin Ma if (!iothread->ctx) { 123eb7b5c35SLin Ma return; 124eb7b5c35SLin Ma } 125be8d8537SStefan Hajnoczi aio_context_unref(iothread->ctx); 126be8d8537SStefan Hajnoczi } 127be8d8537SStefan Hajnoczi 128be8d8537SStefan Hajnoczi static void iothread_complete(UserCreatable *obj, Error **errp) 129be8d8537SStefan Hajnoczi { 1302f78e491SChrysostomos Nanakos Error *local_error = NULL; 131be8d8537SStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 132d21e8776SPaolo Bonzini char *name, *thread_name; 133be8d8537SStefan Hajnoczi 134be8d8537SStefan Hajnoczi iothread->stopping = false; 13588eb7c29SStefan Hajnoczi iothread->thread_id = -1; 1362f78e491SChrysostomos Nanakos iothread->ctx = aio_context_new(&local_error); 1372f78e491SChrysostomos Nanakos if (!iothread->ctx) { 1382f78e491SChrysostomos Nanakos error_propagate(errp, local_error); 1392f78e491SChrysostomos Nanakos return; 1402f78e491SChrysostomos Nanakos } 14188eb7c29SStefan Hajnoczi 1425e5db499SStefan Hajnoczi aio_context_set_poll_params(iothread->ctx, 1435e5db499SStefan Hajnoczi iothread->poll_max_ns, 1445e5db499SStefan Hajnoczi iothread->poll_grow, 1455e5db499SStefan Hajnoczi iothread->poll_shrink, 1460d9d86fbSStefan Hajnoczi &local_error); 1470d9d86fbSStefan Hajnoczi if (local_error) { 1480d9d86fbSStefan Hajnoczi error_propagate(errp, local_error); 1490d9d86fbSStefan Hajnoczi aio_context_unref(iothread->ctx); 1500d9d86fbSStefan Hajnoczi iothread->ctx = NULL; 1510d9d86fbSStefan Hajnoczi return; 1520d9d86fbSStefan Hajnoczi } 1530d9d86fbSStefan Hajnoczi 15488eb7c29SStefan Hajnoczi qemu_mutex_init(&iothread->init_done_lock); 15588eb7c29SStefan Hajnoczi qemu_cond_init(&iothread->init_done_cond); 156329163cbSWang Yong iothread->once = (GOnce) G_ONCE_INIT; 157be8d8537SStefan Hajnoczi 158be8d8537SStefan Hajnoczi /* This assumes we are called from a thread with useful CPU affinity for us 159be8d8537SStefan Hajnoczi * to inherit. 160be8d8537SStefan Hajnoczi */ 161d21e8776SPaolo Bonzini name = object_get_canonical_path_component(OBJECT(obj)); 162d21e8776SPaolo Bonzini thread_name = g_strdup_printf("IO %s", name); 163d21e8776SPaolo Bonzini qemu_thread_create(&iothread->thread, thread_name, iothread_run, 164be8d8537SStefan Hajnoczi iothread, QEMU_THREAD_JOINABLE); 165d21e8776SPaolo Bonzini g_free(thread_name); 166d21e8776SPaolo Bonzini g_free(name); 16788eb7c29SStefan Hajnoczi 16888eb7c29SStefan Hajnoczi /* Wait for initialization to complete */ 16988eb7c29SStefan Hajnoczi qemu_mutex_lock(&iothread->init_done_lock); 17088eb7c29SStefan Hajnoczi while (iothread->thread_id == -1) { 17188eb7c29SStefan Hajnoczi qemu_cond_wait(&iothread->init_done_cond, 17288eb7c29SStefan Hajnoczi &iothread->init_done_lock); 17388eb7c29SStefan Hajnoczi } 17488eb7c29SStefan Hajnoczi qemu_mutex_unlock(&iothread->init_done_lock); 175be8d8537SStefan Hajnoczi } 176be8d8537SStefan Hajnoczi 1775e5db499SStefan Hajnoczi typedef struct { 1785e5db499SStefan Hajnoczi const char *name; 1795e5db499SStefan Hajnoczi ptrdiff_t offset; /* field's byte offset in IOThread struct */ 1805e5db499SStefan Hajnoczi } PollParamInfo; 1815e5db499SStefan Hajnoczi 1825e5db499SStefan Hajnoczi static PollParamInfo poll_max_ns_info = { 1835e5db499SStefan Hajnoczi "poll-max-ns", offsetof(IOThread, poll_max_ns), 1845e5db499SStefan Hajnoczi }; 1855e5db499SStefan Hajnoczi static PollParamInfo poll_grow_info = { 1865e5db499SStefan Hajnoczi "poll-grow", offsetof(IOThread, poll_grow), 1875e5db499SStefan Hajnoczi }; 1885e5db499SStefan Hajnoczi static PollParamInfo poll_shrink_info = { 1895e5db499SStefan Hajnoczi "poll-shrink", offsetof(IOThread, poll_shrink), 1905e5db499SStefan Hajnoczi }; 1915e5db499SStefan Hajnoczi 1925e5db499SStefan Hajnoczi static void iothread_get_poll_param(Object *obj, Visitor *v, 1930d9d86fbSStefan Hajnoczi const char *name, void *opaque, Error **errp) 1940d9d86fbSStefan Hajnoczi { 1950d9d86fbSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 1965e5db499SStefan Hajnoczi PollParamInfo *info = opaque; 1975e5db499SStefan Hajnoczi int64_t *field = (void *)iothread + info->offset; 1980d9d86fbSStefan Hajnoczi 1995e5db499SStefan Hajnoczi visit_type_int64(v, name, field, errp); 2000d9d86fbSStefan Hajnoczi } 2010d9d86fbSStefan Hajnoczi 2025e5db499SStefan Hajnoczi static void iothread_set_poll_param(Object *obj, Visitor *v, 2030d9d86fbSStefan Hajnoczi const char *name, void *opaque, Error **errp) 2040d9d86fbSStefan Hajnoczi { 2050d9d86fbSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 2065e5db499SStefan Hajnoczi PollParamInfo *info = opaque; 2075e5db499SStefan Hajnoczi int64_t *field = (void *)iothread + info->offset; 2080d9d86fbSStefan Hajnoczi Error *local_err = NULL; 2090d9d86fbSStefan Hajnoczi int64_t value; 2100d9d86fbSStefan Hajnoczi 2110d9d86fbSStefan Hajnoczi visit_type_int64(v, name, &value, &local_err); 2120d9d86fbSStefan Hajnoczi if (local_err) { 2130d9d86fbSStefan Hajnoczi goto out; 2140d9d86fbSStefan Hajnoczi } 2150d9d86fbSStefan Hajnoczi 2160d9d86fbSStefan Hajnoczi if (value < 0) { 2175e5db499SStefan Hajnoczi error_setg(&local_err, "%s value must be in range [0, %"PRId64"]", 2185e5db499SStefan Hajnoczi info->name, INT64_MAX); 2190d9d86fbSStefan Hajnoczi goto out; 2200d9d86fbSStefan Hajnoczi } 2210d9d86fbSStefan Hajnoczi 2225e5db499SStefan Hajnoczi *field = value; 2230d9d86fbSStefan Hajnoczi 2240d9d86fbSStefan Hajnoczi if (iothread->ctx) { 2255e5db499SStefan Hajnoczi aio_context_set_poll_params(iothread->ctx, 2265e5db499SStefan Hajnoczi iothread->poll_max_ns, 2275e5db499SStefan Hajnoczi iothread->poll_grow, 2285e5db499SStefan Hajnoczi iothread->poll_shrink, 2295e5db499SStefan Hajnoczi &local_err); 2300d9d86fbSStefan Hajnoczi } 2310d9d86fbSStefan Hajnoczi 2320d9d86fbSStefan Hajnoczi out: 2330d9d86fbSStefan Hajnoczi error_propagate(errp, local_err); 2340d9d86fbSStefan Hajnoczi } 2350d9d86fbSStefan Hajnoczi 236be8d8537SStefan Hajnoczi static void iothread_class_init(ObjectClass *klass, void *class_data) 237be8d8537SStefan Hajnoczi { 238be8d8537SStefan Hajnoczi UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass); 239be8d8537SStefan Hajnoczi ucc->complete = iothread_complete; 2400d9d86fbSStefan Hajnoczi 2410d9d86fbSStefan Hajnoczi object_class_property_add(klass, "poll-max-ns", "int", 2425e5db499SStefan Hajnoczi iothread_get_poll_param, 2435e5db499SStefan Hajnoczi iothread_set_poll_param, 2445e5db499SStefan Hajnoczi NULL, &poll_max_ns_info, &error_abort); 2455e5db499SStefan Hajnoczi object_class_property_add(klass, "poll-grow", "int", 2465e5db499SStefan Hajnoczi iothread_get_poll_param, 2475e5db499SStefan Hajnoczi iothread_set_poll_param, 2485e5db499SStefan Hajnoczi NULL, &poll_grow_info, &error_abort); 2495e5db499SStefan Hajnoczi object_class_property_add(klass, "poll-shrink", "int", 2505e5db499SStefan Hajnoczi iothread_get_poll_param, 2515e5db499SStefan Hajnoczi iothread_set_poll_param, 2525e5db499SStefan Hajnoczi NULL, &poll_shrink_info, &error_abort); 253be8d8537SStefan Hajnoczi } 254be8d8537SStefan Hajnoczi 255be8d8537SStefan Hajnoczi static const TypeInfo iothread_info = { 256be8d8537SStefan Hajnoczi .name = TYPE_IOTHREAD, 257be8d8537SStefan Hajnoczi .parent = TYPE_OBJECT, 258be8d8537SStefan Hajnoczi .class_init = iothread_class_init, 259be8d8537SStefan Hajnoczi .instance_size = sizeof(IOThread), 260cdd7abfdSStefan Hajnoczi .instance_init = iothread_instance_init, 261be8d8537SStefan Hajnoczi .instance_finalize = iothread_instance_finalize, 262be8d8537SStefan Hajnoczi .interfaces = (InterfaceInfo[]) { 263be8d8537SStefan Hajnoczi {TYPE_USER_CREATABLE}, 264be8d8537SStefan Hajnoczi {} 265be8d8537SStefan Hajnoczi }, 266be8d8537SStefan Hajnoczi }; 267be8d8537SStefan Hajnoczi 268be8d8537SStefan Hajnoczi static void iothread_register_types(void) 269be8d8537SStefan Hajnoczi { 270be8d8537SStefan Hajnoczi type_register_static(&iothread_info); 271be8d8537SStefan Hajnoczi } 272be8d8537SStefan Hajnoczi 273be8d8537SStefan Hajnoczi type_init(iothread_register_types) 274be8d8537SStefan Hajnoczi 275be8d8537SStefan Hajnoczi char *iothread_get_id(IOThread *iothread) 276be8d8537SStefan Hajnoczi { 277be8d8537SStefan Hajnoczi return object_get_canonical_path_component(OBJECT(iothread)); 278be8d8537SStefan Hajnoczi } 279be8d8537SStefan Hajnoczi 280be8d8537SStefan Hajnoczi AioContext *iothread_get_aio_context(IOThread *iothread) 281be8d8537SStefan Hajnoczi { 282be8d8537SStefan Hajnoczi return iothread->ctx; 283be8d8537SStefan Hajnoczi } 284dc3dd0d2SStefan Hajnoczi 285dc3dd0d2SStefan Hajnoczi static int query_one_iothread(Object *object, void *opaque) 286dc3dd0d2SStefan Hajnoczi { 287dc3dd0d2SStefan Hajnoczi IOThreadInfoList ***prev = opaque; 288dc3dd0d2SStefan Hajnoczi IOThreadInfoList *elem; 289dc3dd0d2SStefan Hajnoczi IOThreadInfo *info; 290dc3dd0d2SStefan Hajnoczi IOThread *iothread; 291dc3dd0d2SStefan Hajnoczi 292dc3dd0d2SStefan Hajnoczi iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); 293dc3dd0d2SStefan Hajnoczi if (!iothread) { 294dc3dd0d2SStefan Hajnoczi return 0; 295dc3dd0d2SStefan Hajnoczi } 296dc3dd0d2SStefan Hajnoczi 297dc3dd0d2SStefan Hajnoczi info = g_new0(IOThreadInfo, 1); 298dc3dd0d2SStefan Hajnoczi info->id = iothread_get_id(iothread); 299dc3dd0d2SStefan Hajnoczi info->thread_id = iothread->thread_id; 3005fc00480SPavel Hrdina info->poll_max_ns = iothread->poll_max_ns; 3015fc00480SPavel Hrdina info->poll_grow = iothread->poll_grow; 3025fc00480SPavel Hrdina info->poll_shrink = iothread->poll_shrink; 303dc3dd0d2SStefan Hajnoczi 304dc3dd0d2SStefan Hajnoczi elem = g_new0(IOThreadInfoList, 1); 305dc3dd0d2SStefan Hajnoczi elem->value = info; 306dc3dd0d2SStefan Hajnoczi elem->next = NULL; 307dc3dd0d2SStefan Hajnoczi 308dc3dd0d2SStefan Hajnoczi **prev = elem; 309dc3dd0d2SStefan Hajnoczi *prev = &elem->next; 310dc3dd0d2SStefan Hajnoczi return 0; 311dc3dd0d2SStefan Hajnoczi } 312dc3dd0d2SStefan Hajnoczi 313dc3dd0d2SStefan Hajnoczi IOThreadInfoList *qmp_query_iothreads(Error **errp) 314dc3dd0d2SStefan Hajnoczi { 315dc3dd0d2SStefan Hajnoczi IOThreadInfoList *head = NULL; 316dc3dd0d2SStefan Hajnoczi IOThreadInfoList **prev = &head; 317bc2256c4SDaniel P. Berrange Object *container = object_get_objects_root(); 318dc3dd0d2SStefan Hajnoczi 319dc3dd0d2SStefan Hajnoczi object_child_foreach(container, query_one_iothread, &prev); 320dc3dd0d2SStefan Hajnoczi return head; 321dc3dd0d2SStefan Hajnoczi } 322dce8921bSFam Zheng 323dce8921bSFam Zheng void iothread_stop_all(void) 324dce8921bSFam Zheng { 325dce8921bSFam Zheng Object *container = object_get_objects_root(); 326d16341faSPaolo Bonzini BlockDriverState *bs; 327d16341faSPaolo Bonzini BdrvNextIterator it; 328d16341faSPaolo Bonzini 329d16341faSPaolo Bonzini for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { 330d16341faSPaolo Bonzini AioContext *ctx = bdrv_get_aio_context(bs); 331d16341faSPaolo Bonzini if (ctx == qemu_get_aio_context()) { 332d16341faSPaolo Bonzini continue; 333d16341faSPaolo Bonzini } 334d16341faSPaolo Bonzini aio_context_acquire(ctx); 335d16341faSPaolo Bonzini bdrv_set_aio_context(bs, qemu_get_aio_context()); 336d16341faSPaolo Bonzini aio_context_release(ctx); 337d16341faSPaolo Bonzini } 338dce8921bSFam Zheng 339*82d90705SPeter Xu object_child_foreach(container, iothread_stop_iter, NULL); 340dce8921bSFam Zheng } 341329163cbSWang Yong 342329163cbSWang Yong static gpointer iothread_g_main_context_init(gpointer opaque) 343329163cbSWang Yong { 344329163cbSWang Yong AioContext *ctx; 345329163cbSWang Yong IOThread *iothread = opaque; 346329163cbSWang Yong GSource *source; 347329163cbSWang Yong 348329163cbSWang Yong iothread->worker_context = g_main_context_new(); 349329163cbSWang Yong 350329163cbSWang Yong ctx = iothread_get_aio_context(iothread); 351329163cbSWang Yong source = aio_get_g_source(ctx); 352329163cbSWang Yong g_source_attach(source, iothread->worker_context); 353329163cbSWang Yong g_source_unref(source); 354329163cbSWang Yong 355329163cbSWang Yong aio_notify(iothread->ctx); 356329163cbSWang Yong return NULL; 357329163cbSWang Yong } 358329163cbSWang Yong 359329163cbSWang Yong GMainContext *iothread_get_g_main_context(IOThread *iothread) 360329163cbSWang Yong { 361329163cbSWang Yong g_once(&iothread->once, iothread_g_main_context_init, iothread); 362329163cbSWang Yong 363329163cbSWang Yong return iothread->worker_context; 364329163cbSWang Yong } 3650173e21bSPeter Xu 3660173e21bSPeter Xu IOThread *iothread_create(const char *id, Error **errp) 3670173e21bSPeter Xu { 3680173e21bSPeter Xu Object *obj; 3690173e21bSPeter Xu 3700173e21bSPeter Xu obj = object_new_with_props(TYPE_IOTHREAD, 3710173e21bSPeter Xu object_get_internal_root(), 3720173e21bSPeter Xu id, errp, NULL); 3730173e21bSPeter Xu 3740173e21bSPeter Xu return IOTHREAD(obj); 3750173e21bSPeter Xu } 3760173e21bSPeter Xu 3770173e21bSPeter Xu void iothread_destroy(IOThread *iothread) 3780173e21bSPeter Xu { 3790173e21bSPeter Xu object_unparent(OBJECT(iothread)); 3800173e21bSPeter Xu } 381