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" 21e688df6bSMarkus Armbruster #include "qapi/error.h" 22112ed241SMarkus Armbruster #include "qapi/qapi-commands-misc.h" 232f78e491SChrysostomos Nanakos #include "qemu/error-report.h" 24ab28bd23SPaolo Bonzini #include "qemu/rcu.h" 25e4370165SPaolo Bonzini #include "qemu/main-loop.h" 26be8d8537SStefan Hajnoczi 27be8d8537SStefan Hajnoczi typedef ObjectClass IOThreadClass; 28be8d8537SStefan Hajnoczi 29be8d8537SStefan Hajnoczi #define IOTHREAD_GET_CLASS(obj) \ 30be8d8537SStefan Hajnoczi OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD) 31be8d8537SStefan Hajnoczi #define IOTHREAD_CLASS(klass) \ 32be8d8537SStefan Hajnoczi OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD) 33be8d8537SStefan Hajnoczi 3490c558beSPeter Xu #ifdef CONFIG_POSIX 35cdd7abfdSStefan Hajnoczi /* Benchmark results from 2016 on NVMe SSD drives show max polling times around 36cdd7abfdSStefan Hajnoczi * 16-32 microseconds yield IOPS improvements for both iodepth=1 and iodepth=32 37cdd7abfdSStefan Hajnoczi * workloads. 38cdd7abfdSStefan Hajnoczi */ 39cdd7abfdSStefan Hajnoczi #define IOTHREAD_POLL_MAX_NS_DEFAULT 32768ULL 4090c558beSPeter Xu #else 4190c558beSPeter Xu #define IOTHREAD_POLL_MAX_NS_DEFAULT 0ULL 4290c558beSPeter Xu #endif 43cdd7abfdSStefan Hajnoczi 44e4370165SPaolo Bonzini static __thread IOThread *my_iothread; 45e4370165SPaolo Bonzini 46e4370165SPaolo Bonzini AioContext *qemu_get_current_aio_context(void) 47e4370165SPaolo Bonzini { 48e4370165SPaolo Bonzini return my_iothread ? my_iothread->ctx : qemu_get_aio_context(); 49e4370165SPaolo Bonzini } 50e4370165SPaolo Bonzini 51be8d8537SStefan Hajnoczi static void *iothread_run(void *opaque) 52be8d8537SStefan Hajnoczi { 53be8d8537SStefan Hajnoczi IOThread *iothread = opaque; 54be8d8537SStefan Hajnoczi 55ab28bd23SPaolo Bonzini rcu_register_thread(); 56b60ec76aSPeter Xu /* 57b60ec76aSPeter Xu * g_main_context_push_thread_default() must be called before anything 58b60ec76aSPeter Xu * in this new thread uses glib. 59b60ec76aSPeter Xu */ 60b60ec76aSPeter Xu g_main_context_push_thread_default(iothread->worker_context); 61e4370165SPaolo Bonzini my_iothread = iothread; 6288eb7c29SStefan Hajnoczi iothread->thread_id = qemu_get_thread_id(); 6321c4d15bSPeter Xu qemu_sem_post(&iothread->init_done_sem); 6488eb7c29SStefan Hajnoczi 652362a28eSStefan Hajnoczi while (iothread->running) { 666ca20620SPeter Xu /* 676ca20620SPeter Xu * Note: from functional-wise the g_main_loop_run() below can 686ca20620SPeter Xu * already cover the aio_poll() events, but we can't run the 696ca20620SPeter Xu * main loop unconditionally because explicit aio_poll() here 706ca20620SPeter Xu * is faster than g_main_loop_run() when we do not need the 716ca20620SPeter Xu * gcontext at all (e.g., pure block layer iothreads). In 726ca20620SPeter Xu * other words, when we want to run the gcontext with the 736ca20620SPeter Xu * iothread we need to pay some performance for functionality. 746ca20620SPeter Xu */ 7565c1b5b6SPaolo Bonzini aio_poll(iothread->ctx, true); 76329163cbSWang Yong 776c95363dSPeter Xu /* 786c95363dSPeter Xu * We must check the running state again in case it was 796c95363dSPeter Xu * changed in previous aio_poll() 806c95363dSPeter Xu */ 81b506e0f1SPeter Xu if (iothread->running && atomic_read(&iothread->run_gcontext)) { 82329163cbSWang Yong g_main_loop_run(iothread->main_loop); 83329163cbSWang Yong } 84be8d8537SStefan Hajnoczi } 85ab28bd23SPaolo Bonzini 86b60ec76aSPeter Xu g_main_context_pop_thread_default(iothread->worker_context); 87ab28bd23SPaolo Bonzini rcu_unregister_thread(); 88be8d8537SStefan Hajnoczi return NULL; 89be8d8537SStefan Hajnoczi } 90be8d8537SStefan Hajnoczi 912362a28eSStefan Hajnoczi /* Runs in iothread_run() thread */ 922362a28eSStefan Hajnoczi static void iothread_stop_bh(void *opaque) 932362a28eSStefan Hajnoczi { 942362a28eSStefan Hajnoczi IOThread *iothread = opaque; 952362a28eSStefan Hajnoczi 962362a28eSStefan Hajnoczi iothread->running = false; /* stop iothread_run() */ 972362a28eSStefan Hajnoczi 982362a28eSStefan Hajnoczi if (iothread->main_loop) { 992362a28eSStefan Hajnoczi g_main_loop_quit(iothread->main_loop); 1002362a28eSStefan Hajnoczi } 1012362a28eSStefan Hajnoczi } 1022362a28eSStefan Hajnoczi 10382d90705SPeter Xu void iothread_stop(IOThread *iothread) 104be8d8537SStefan Hajnoczi { 10582d90705SPeter Xu if (!iothread->ctx || iothread->stopping) { 10682d90705SPeter Xu return; 1072f78e491SChrysostomos Nanakos } 108be8d8537SStefan Hajnoczi iothread->stopping = true; 1092362a28eSStefan Hajnoczi aio_bh_schedule_oneshot(iothread->ctx, iothread_stop_bh, iothread); 110be8d8537SStefan Hajnoczi qemu_thread_join(&iothread->thread); 11182d90705SPeter Xu } 11282d90705SPeter Xu 113cdd7abfdSStefan Hajnoczi static void iothread_instance_init(Object *obj) 114cdd7abfdSStefan Hajnoczi { 115cdd7abfdSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 116cdd7abfdSStefan Hajnoczi 117cdd7abfdSStefan Hajnoczi iothread->poll_max_ns = IOTHREAD_POLL_MAX_NS_DEFAULT; 11814a2d118SMarc-André Lureau iothread->thread_id = -1; 11921c4d15bSPeter Xu qemu_sem_init(&iothread->init_done_sem, 0); 120b506e0f1SPeter Xu /* By default, we don't run gcontext */ 121b506e0f1SPeter Xu atomic_set(&iothread->run_gcontext, 0); 122cdd7abfdSStefan Hajnoczi } 123cdd7abfdSStefan Hajnoczi 124dce8921bSFam Zheng static void iothread_instance_finalize(Object *obj) 125dce8921bSFam Zheng { 126dce8921bSFam Zheng IOThread *iothread = IOTHREAD(obj); 127dce8921bSFam Zheng 12882d90705SPeter Xu iothread_stop(iothread); 12914a2d118SMarc-André Lureau 13015544349SPeter Xu /* 13115544349SPeter Xu * Before glib2 2.33.10, there is a glib2 bug that GSource context 13215544349SPeter Xu * pointer may not be cleared even if the context has already been 13315544349SPeter Xu * destroyed (while it should). Here let's free the AIO context 13415544349SPeter Xu * earlier to bypass that glib bug. 13515544349SPeter Xu * 13615544349SPeter Xu * We can remove this comment after the minimum supported glib2 13715544349SPeter Xu * version boosts to 2.33.10. Before that, let's free the 13815544349SPeter Xu * GSources first before destroying any GMainContext. 13915544349SPeter Xu */ 14015544349SPeter Xu if (iothread->ctx) { 14115544349SPeter Xu aio_context_unref(iothread->ctx); 14215544349SPeter Xu iothread->ctx = NULL; 14315544349SPeter Xu } 1445b3ac23fSPeter Xu if (iothread->worker_context) { 1455b3ac23fSPeter Xu g_main_context_unref(iothread->worker_context); 1465b3ac23fSPeter Xu iothread->worker_context = NULL; 1470bd2d233SPeter Xu g_main_loop_unref(iothread->main_loop); 1480bd2d233SPeter Xu iothread->main_loop = NULL; 1495b3ac23fSPeter Xu } 15021c4d15bSPeter Xu qemu_sem_destroy(&iothread->init_done_sem); 151be8d8537SStefan Hajnoczi } 152be8d8537SStefan Hajnoczi 153b506e0f1SPeter Xu static void iothread_init_gcontext(IOThread *iothread) 154b506e0f1SPeter Xu { 155b506e0f1SPeter Xu GSource *source; 156b506e0f1SPeter Xu 157b506e0f1SPeter Xu iothread->worker_context = g_main_context_new(); 158b506e0f1SPeter Xu source = aio_get_g_source(iothread_get_aio_context(iothread)); 159b506e0f1SPeter Xu g_source_attach(source, iothread->worker_context); 160b506e0f1SPeter Xu g_source_unref(source); 1610bd2d233SPeter Xu iothread->main_loop = g_main_loop_new(iothread->worker_context, TRUE); 162b506e0f1SPeter Xu } 163b506e0f1SPeter Xu 164be8d8537SStefan Hajnoczi static void iothread_complete(UserCreatable *obj, Error **errp) 165be8d8537SStefan Hajnoczi { 1662f78e491SChrysostomos Nanakos Error *local_error = NULL; 167be8d8537SStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 168d21e8776SPaolo Bonzini char *name, *thread_name; 169be8d8537SStefan Hajnoczi 170be8d8537SStefan Hajnoczi iothread->stopping = false; 1712362a28eSStefan Hajnoczi iothread->running = true; 1722f78e491SChrysostomos Nanakos iothread->ctx = aio_context_new(&local_error); 1732f78e491SChrysostomos Nanakos if (!iothread->ctx) { 1742f78e491SChrysostomos Nanakos error_propagate(errp, local_error); 1752f78e491SChrysostomos Nanakos return; 1762f78e491SChrysostomos Nanakos } 17788eb7c29SStefan Hajnoczi 178b506e0f1SPeter Xu /* 179b506e0f1SPeter Xu * Init one GMainContext for the iothread unconditionally, even if 180b506e0f1SPeter Xu * it's not used 181b506e0f1SPeter Xu */ 182b506e0f1SPeter Xu iothread_init_gcontext(iothread); 183b506e0f1SPeter Xu 1845e5db499SStefan Hajnoczi aio_context_set_poll_params(iothread->ctx, 1855e5db499SStefan Hajnoczi iothread->poll_max_ns, 1865e5db499SStefan Hajnoczi iothread->poll_grow, 1875e5db499SStefan Hajnoczi iothread->poll_shrink, 1880d9d86fbSStefan Hajnoczi &local_error); 1890d9d86fbSStefan Hajnoczi if (local_error) { 1900d9d86fbSStefan Hajnoczi error_propagate(errp, local_error); 1910d9d86fbSStefan Hajnoczi aio_context_unref(iothread->ctx); 1920d9d86fbSStefan Hajnoczi iothread->ctx = NULL; 1930d9d86fbSStefan Hajnoczi return; 1940d9d86fbSStefan Hajnoczi } 1950d9d86fbSStefan Hajnoczi 196be8d8537SStefan Hajnoczi /* This assumes we are called from a thread with useful CPU affinity for us 197be8d8537SStefan Hajnoczi * to inherit. 198be8d8537SStefan Hajnoczi */ 199d21e8776SPaolo Bonzini name = object_get_canonical_path_component(OBJECT(obj)); 200d21e8776SPaolo Bonzini thread_name = g_strdup_printf("IO %s", name); 201d21e8776SPaolo Bonzini qemu_thread_create(&iothread->thread, thread_name, iothread_run, 202be8d8537SStefan Hajnoczi iothread, QEMU_THREAD_JOINABLE); 203d21e8776SPaolo Bonzini g_free(thread_name); 204d21e8776SPaolo Bonzini g_free(name); 20588eb7c29SStefan Hajnoczi 20688eb7c29SStefan Hajnoczi /* Wait for initialization to complete */ 20788eb7c29SStefan Hajnoczi while (iothread->thread_id == -1) { 20821c4d15bSPeter Xu qemu_sem_wait(&iothread->init_done_sem); 20988eb7c29SStefan Hajnoczi } 210be8d8537SStefan Hajnoczi } 211be8d8537SStefan Hajnoczi 2125e5db499SStefan Hajnoczi typedef struct { 2135e5db499SStefan Hajnoczi const char *name; 2145e5db499SStefan Hajnoczi ptrdiff_t offset; /* field's byte offset in IOThread struct */ 2155e5db499SStefan Hajnoczi } PollParamInfo; 2165e5db499SStefan Hajnoczi 2175e5db499SStefan Hajnoczi static PollParamInfo poll_max_ns_info = { 2185e5db499SStefan Hajnoczi "poll-max-ns", offsetof(IOThread, poll_max_ns), 2195e5db499SStefan Hajnoczi }; 2205e5db499SStefan Hajnoczi static PollParamInfo poll_grow_info = { 2215e5db499SStefan Hajnoczi "poll-grow", offsetof(IOThread, poll_grow), 2225e5db499SStefan Hajnoczi }; 2235e5db499SStefan Hajnoczi static PollParamInfo poll_shrink_info = { 2245e5db499SStefan Hajnoczi "poll-shrink", offsetof(IOThread, poll_shrink), 2255e5db499SStefan Hajnoczi }; 2265e5db499SStefan Hajnoczi 2275e5db499SStefan Hajnoczi static void iothread_get_poll_param(Object *obj, Visitor *v, 2280d9d86fbSStefan Hajnoczi const char *name, void *opaque, Error **errp) 2290d9d86fbSStefan Hajnoczi { 2300d9d86fbSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 2315e5db499SStefan Hajnoczi PollParamInfo *info = opaque; 2325e5db499SStefan Hajnoczi int64_t *field = (void *)iothread + info->offset; 2330d9d86fbSStefan Hajnoczi 2345e5db499SStefan Hajnoczi visit_type_int64(v, name, field, errp); 2350d9d86fbSStefan Hajnoczi } 2360d9d86fbSStefan Hajnoczi 2375e5db499SStefan Hajnoczi static void iothread_set_poll_param(Object *obj, Visitor *v, 2380d9d86fbSStefan Hajnoczi const char *name, void *opaque, Error **errp) 2390d9d86fbSStefan Hajnoczi { 2400d9d86fbSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 2415e5db499SStefan Hajnoczi PollParamInfo *info = opaque; 2425e5db499SStefan Hajnoczi int64_t *field = (void *)iothread + info->offset; 2430d9d86fbSStefan Hajnoczi Error *local_err = NULL; 2440d9d86fbSStefan Hajnoczi int64_t value; 2450d9d86fbSStefan Hajnoczi 24662a35aaaSMarkus Armbruster if (!visit_type_int64(v, name, &value, &local_err)) { 247*dcfe4805SMarkus Armbruster error_propagate(errp, local_err); 248*dcfe4805SMarkus Armbruster return; 2490d9d86fbSStefan Hajnoczi } 2500d9d86fbSStefan Hajnoczi 2510d9d86fbSStefan Hajnoczi if (value < 0) { 252*dcfe4805SMarkus Armbruster error_setg(errp, "%s value must be in range [0, %" PRId64 "]", 2535e5db499SStefan Hajnoczi info->name, INT64_MAX); 254*dcfe4805SMarkus Armbruster return; 2550d9d86fbSStefan Hajnoczi } 2560d9d86fbSStefan Hajnoczi 2575e5db499SStefan Hajnoczi *field = value; 2580d9d86fbSStefan Hajnoczi 2590d9d86fbSStefan Hajnoczi if (iothread->ctx) { 2605e5db499SStefan Hajnoczi aio_context_set_poll_params(iothread->ctx, 2615e5db499SStefan Hajnoczi iothread->poll_max_ns, 2625e5db499SStefan Hajnoczi iothread->poll_grow, 2635e5db499SStefan Hajnoczi iothread->poll_shrink, 264*dcfe4805SMarkus Armbruster errp); 2650d9d86fbSStefan Hajnoczi } 2660d9d86fbSStefan Hajnoczi } 2670d9d86fbSStefan Hajnoczi 268be8d8537SStefan Hajnoczi static void iothread_class_init(ObjectClass *klass, void *class_data) 269be8d8537SStefan Hajnoczi { 270be8d8537SStefan Hajnoczi UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass); 271be8d8537SStefan Hajnoczi ucc->complete = iothread_complete; 2720d9d86fbSStefan Hajnoczi 2730d9d86fbSStefan Hajnoczi object_class_property_add(klass, "poll-max-ns", "int", 2745e5db499SStefan Hajnoczi iothread_get_poll_param, 2755e5db499SStefan Hajnoczi iothread_set_poll_param, 276d2623129SMarkus Armbruster NULL, &poll_max_ns_info); 2775e5db499SStefan Hajnoczi object_class_property_add(klass, "poll-grow", "int", 2785e5db499SStefan Hajnoczi iothread_get_poll_param, 2795e5db499SStefan Hajnoczi iothread_set_poll_param, 280d2623129SMarkus Armbruster NULL, &poll_grow_info); 2815e5db499SStefan Hajnoczi object_class_property_add(klass, "poll-shrink", "int", 2825e5db499SStefan Hajnoczi iothread_get_poll_param, 2835e5db499SStefan Hajnoczi iothread_set_poll_param, 284d2623129SMarkus Armbruster NULL, &poll_shrink_info); 285be8d8537SStefan Hajnoczi } 286be8d8537SStefan Hajnoczi 287be8d8537SStefan Hajnoczi static const TypeInfo iothread_info = { 288be8d8537SStefan Hajnoczi .name = TYPE_IOTHREAD, 289be8d8537SStefan Hajnoczi .parent = TYPE_OBJECT, 290be8d8537SStefan Hajnoczi .class_init = iothread_class_init, 291be8d8537SStefan Hajnoczi .instance_size = sizeof(IOThread), 292cdd7abfdSStefan Hajnoczi .instance_init = iothread_instance_init, 293be8d8537SStefan Hajnoczi .instance_finalize = iothread_instance_finalize, 294be8d8537SStefan Hajnoczi .interfaces = (InterfaceInfo[]) { 295be8d8537SStefan Hajnoczi {TYPE_USER_CREATABLE}, 296be8d8537SStefan Hajnoczi {} 297be8d8537SStefan Hajnoczi }, 298be8d8537SStefan Hajnoczi }; 299be8d8537SStefan Hajnoczi 300be8d8537SStefan Hajnoczi static void iothread_register_types(void) 301be8d8537SStefan Hajnoczi { 302be8d8537SStefan Hajnoczi type_register_static(&iothread_info); 303be8d8537SStefan Hajnoczi } 304be8d8537SStefan Hajnoczi 305be8d8537SStefan Hajnoczi type_init(iothread_register_types) 306be8d8537SStefan Hajnoczi 307be8d8537SStefan Hajnoczi char *iothread_get_id(IOThread *iothread) 308be8d8537SStefan Hajnoczi { 309be8d8537SStefan Hajnoczi return object_get_canonical_path_component(OBJECT(iothread)); 310be8d8537SStefan Hajnoczi } 311be8d8537SStefan Hajnoczi 312be8d8537SStefan Hajnoczi AioContext *iothread_get_aio_context(IOThread *iothread) 313be8d8537SStefan Hajnoczi { 314be8d8537SStefan Hajnoczi return iothread->ctx; 315be8d8537SStefan Hajnoczi } 316dc3dd0d2SStefan Hajnoczi 317dc3dd0d2SStefan Hajnoczi static int query_one_iothread(Object *object, void *opaque) 318dc3dd0d2SStefan Hajnoczi { 319dc3dd0d2SStefan Hajnoczi IOThreadInfoList ***prev = opaque; 320dc3dd0d2SStefan Hajnoczi IOThreadInfoList *elem; 321dc3dd0d2SStefan Hajnoczi IOThreadInfo *info; 322dc3dd0d2SStefan Hajnoczi IOThread *iothread; 323dc3dd0d2SStefan Hajnoczi 324dc3dd0d2SStefan Hajnoczi iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); 325dc3dd0d2SStefan Hajnoczi if (!iothread) { 326dc3dd0d2SStefan Hajnoczi return 0; 327dc3dd0d2SStefan Hajnoczi } 328dc3dd0d2SStefan Hajnoczi 329dc3dd0d2SStefan Hajnoczi info = g_new0(IOThreadInfo, 1); 330dc3dd0d2SStefan Hajnoczi info->id = iothread_get_id(iothread); 331dc3dd0d2SStefan Hajnoczi info->thread_id = iothread->thread_id; 3325fc00480SPavel Hrdina info->poll_max_ns = iothread->poll_max_ns; 3335fc00480SPavel Hrdina info->poll_grow = iothread->poll_grow; 3345fc00480SPavel Hrdina info->poll_shrink = iothread->poll_shrink; 335dc3dd0d2SStefan Hajnoczi 336dc3dd0d2SStefan Hajnoczi elem = g_new0(IOThreadInfoList, 1); 337dc3dd0d2SStefan Hajnoczi elem->value = info; 338dc3dd0d2SStefan Hajnoczi elem->next = NULL; 339dc3dd0d2SStefan Hajnoczi 340dc3dd0d2SStefan Hajnoczi **prev = elem; 341dc3dd0d2SStefan Hajnoczi *prev = &elem->next; 342dc3dd0d2SStefan Hajnoczi return 0; 343dc3dd0d2SStefan Hajnoczi } 344dc3dd0d2SStefan Hajnoczi 345dc3dd0d2SStefan Hajnoczi IOThreadInfoList *qmp_query_iothreads(Error **errp) 346dc3dd0d2SStefan Hajnoczi { 347dc3dd0d2SStefan Hajnoczi IOThreadInfoList *head = NULL; 348dc3dd0d2SStefan Hajnoczi IOThreadInfoList **prev = &head; 349bc2256c4SDaniel P. Berrange Object *container = object_get_objects_root(); 350dc3dd0d2SStefan Hajnoczi 351dc3dd0d2SStefan Hajnoczi object_child_foreach(container, query_one_iothread, &prev); 352dc3dd0d2SStefan Hajnoczi return head; 353dc3dd0d2SStefan Hajnoczi } 354dce8921bSFam Zheng 355329163cbSWang Yong GMainContext *iothread_get_g_main_context(IOThread *iothread) 356329163cbSWang Yong { 357b506e0f1SPeter Xu atomic_set(&iothread->run_gcontext, 1); 358b506e0f1SPeter Xu aio_notify(iothread->ctx); 359329163cbSWang Yong return iothread->worker_context; 360329163cbSWang Yong } 3610173e21bSPeter Xu 3620173e21bSPeter Xu IOThread *iothread_create(const char *id, Error **errp) 3630173e21bSPeter Xu { 3640173e21bSPeter Xu Object *obj; 3650173e21bSPeter Xu 3660173e21bSPeter Xu obj = object_new_with_props(TYPE_IOTHREAD, 3670173e21bSPeter Xu object_get_internal_root(), 3680173e21bSPeter Xu id, errp, NULL); 3690173e21bSPeter Xu 3700173e21bSPeter Xu return IOTHREAD(obj); 3710173e21bSPeter Xu } 3720173e21bSPeter Xu 3730173e21bSPeter Xu void iothread_destroy(IOThread *iothread) 3740173e21bSPeter Xu { 3750173e21bSPeter Xu object_unparent(OBJECT(iothread)); 3760173e21bSPeter Xu } 377fbcc6923SStefan Hajnoczi 378fbcc6923SStefan Hajnoczi /* Lookup IOThread by its id. Only finds user-created objects, not internal 379fbcc6923SStefan Hajnoczi * iothread_create() objects. */ 380fbcc6923SStefan Hajnoczi IOThread *iothread_by_id(const char *id) 381fbcc6923SStefan Hajnoczi { 382fbcc6923SStefan Hajnoczi return IOTHREAD(object_resolve_path_type(id, TYPE_IOTHREAD, NULL)); 383fbcc6923SStefan Hajnoczi } 384