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(); 56ab28bd23SPaolo Bonzini 57e4370165SPaolo Bonzini my_iothread = iothread; 5888eb7c29SStefan Hajnoczi iothread->thread_id = qemu_get_thread_id(); 5921c4d15bSPeter Xu qemu_sem_post(&iothread->init_done_sem); 6088eb7c29SStefan Hajnoczi 612362a28eSStefan Hajnoczi while (iothread->running) { 6265c1b5b6SPaolo Bonzini aio_poll(iothread->ctx, true); 63329163cbSWang Yong 646c95363dSPeter Xu /* 656c95363dSPeter Xu * We must check the running state again in case it was 666c95363dSPeter Xu * changed in previous aio_poll() 676c95363dSPeter Xu */ 68*b506e0f1SPeter Xu if (iothread->running && atomic_read(&iothread->run_gcontext)) { 69329163cbSWang Yong GMainLoop *loop; 70329163cbSWang Yong 71329163cbSWang Yong g_main_context_push_thread_default(iothread->worker_context); 72329163cbSWang Yong iothread->main_loop = 73329163cbSWang Yong g_main_loop_new(iothread->worker_context, TRUE); 74329163cbSWang Yong loop = iothread->main_loop; 75329163cbSWang Yong 76329163cbSWang Yong g_main_loop_run(iothread->main_loop); 77329163cbSWang Yong iothread->main_loop = NULL; 78329163cbSWang Yong g_main_loop_unref(loop); 79329163cbSWang Yong 80329163cbSWang Yong g_main_context_pop_thread_default(iothread->worker_context); 81329163cbSWang Yong } 82be8d8537SStefan Hajnoczi } 83ab28bd23SPaolo Bonzini 84ab28bd23SPaolo Bonzini rcu_unregister_thread(); 85be8d8537SStefan Hajnoczi return NULL; 86be8d8537SStefan Hajnoczi } 87be8d8537SStefan Hajnoczi 882362a28eSStefan Hajnoczi /* Runs in iothread_run() thread */ 892362a28eSStefan Hajnoczi static void iothread_stop_bh(void *opaque) 902362a28eSStefan Hajnoczi { 912362a28eSStefan Hajnoczi IOThread *iothread = opaque; 922362a28eSStefan Hajnoczi 932362a28eSStefan Hajnoczi iothread->running = false; /* stop iothread_run() */ 942362a28eSStefan Hajnoczi 952362a28eSStefan Hajnoczi if (iothread->main_loop) { 962362a28eSStefan Hajnoczi g_main_loop_quit(iothread->main_loop); 972362a28eSStefan Hajnoczi } 982362a28eSStefan Hajnoczi } 992362a28eSStefan Hajnoczi 10082d90705SPeter Xu void iothread_stop(IOThread *iothread) 101be8d8537SStefan Hajnoczi { 10282d90705SPeter Xu if (!iothread->ctx || iothread->stopping) { 10382d90705SPeter Xu return; 1042f78e491SChrysostomos Nanakos } 105be8d8537SStefan Hajnoczi iothread->stopping = true; 1062362a28eSStefan Hajnoczi aio_bh_schedule_oneshot(iothread->ctx, iothread_stop_bh, iothread); 107be8d8537SStefan Hajnoczi qemu_thread_join(&iothread->thread); 10882d90705SPeter Xu } 10982d90705SPeter Xu 110cdd7abfdSStefan Hajnoczi static void iothread_instance_init(Object *obj) 111cdd7abfdSStefan Hajnoczi { 112cdd7abfdSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 113cdd7abfdSStefan Hajnoczi 114cdd7abfdSStefan Hajnoczi iothread->poll_max_ns = IOTHREAD_POLL_MAX_NS_DEFAULT; 11514a2d118SMarc-André Lureau iothread->thread_id = -1; 11621c4d15bSPeter Xu qemu_sem_init(&iothread->init_done_sem, 0); 117*b506e0f1SPeter Xu /* By default, we don't run gcontext */ 118*b506e0f1SPeter Xu atomic_set(&iothread->run_gcontext, 0); 119cdd7abfdSStefan Hajnoczi } 120cdd7abfdSStefan Hajnoczi 121dce8921bSFam Zheng static void iothread_instance_finalize(Object *obj) 122dce8921bSFam Zheng { 123dce8921bSFam Zheng IOThread *iothread = IOTHREAD(obj); 124dce8921bSFam Zheng 12582d90705SPeter Xu iothread_stop(iothread); 12614a2d118SMarc-André Lureau 12715544349SPeter Xu /* 12815544349SPeter Xu * Before glib2 2.33.10, there is a glib2 bug that GSource context 12915544349SPeter Xu * pointer may not be cleared even if the context has already been 13015544349SPeter Xu * destroyed (while it should). Here let's free the AIO context 13115544349SPeter Xu * earlier to bypass that glib bug. 13215544349SPeter Xu * 13315544349SPeter Xu * We can remove this comment after the minimum supported glib2 13415544349SPeter Xu * version boosts to 2.33.10. Before that, let's free the 13515544349SPeter Xu * GSources first before destroying any GMainContext. 13615544349SPeter Xu */ 13715544349SPeter Xu if (iothread->ctx) { 13815544349SPeter Xu aio_context_unref(iothread->ctx); 13915544349SPeter Xu iothread->ctx = NULL; 14015544349SPeter Xu } 1415b3ac23fSPeter Xu if (iothread->worker_context) { 1425b3ac23fSPeter Xu g_main_context_unref(iothread->worker_context); 1435b3ac23fSPeter Xu iothread->worker_context = NULL; 1445b3ac23fSPeter Xu } 14521c4d15bSPeter Xu qemu_sem_destroy(&iothread->init_done_sem); 146be8d8537SStefan Hajnoczi } 147be8d8537SStefan Hajnoczi 148*b506e0f1SPeter Xu static void iothread_init_gcontext(IOThread *iothread) 149*b506e0f1SPeter Xu { 150*b506e0f1SPeter Xu GSource *source; 151*b506e0f1SPeter Xu 152*b506e0f1SPeter Xu iothread->worker_context = g_main_context_new(); 153*b506e0f1SPeter Xu source = aio_get_g_source(iothread_get_aio_context(iothread)); 154*b506e0f1SPeter Xu g_source_attach(source, iothread->worker_context); 155*b506e0f1SPeter Xu g_source_unref(source); 156*b506e0f1SPeter Xu } 157*b506e0f1SPeter Xu 158be8d8537SStefan Hajnoczi static void iothread_complete(UserCreatable *obj, Error **errp) 159be8d8537SStefan Hajnoczi { 1602f78e491SChrysostomos Nanakos Error *local_error = NULL; 161be8d8537SStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 162d21e8776SPaolo Bonzini char *name, *thread_name; 163be8d8537SStefan Hajnoczi 164be8d8537SStefan Hajnoczi iothread->stopping = false; 1652362a28eSStefan Hajnoczi iothread->running = true; 1662f78e491SChrysostomos Nanakos iothread->ctx = aio_context_new(&local_error); 1672f78e491SChrysostomos Nanakos if (!iothread->ctx) { 1682f78e491SChrysostomos Nanakos error_propagate(errp, local_error); 1692f78e491SChrysostomos Nanakos return; 1702f78e491SChrysostomos Nanakos } 17188eb7c29SStefan Hajnoczi 172*b506e0f1SPeter Xu /* 173*b506e0f1SPeter Xu * Init one GMainContext for the iothread unconditionally, even if 174*b506e0f1SPeter Xu * it's not used 175*b506e0f1SPeter Xu */ 176*b506e0f1SPeter Xu iothread_init_gcontext(iothread); 177*b506e0f1SPeter Xu 1785e5db499SStefan Hajnoczi aio_context_set_poll_params(iothread->ctx, 1795e5db499SStefan Hajnoczi iothread->poll_max_ns, 1805e5db499SStefan Hajnoczi iothread->poll_grow, 1815e5db499SStefan Hajnoczi iothread->poll_shrink, 1820d9d86fbSStefan Hajnoczi &local_error); 1830d9d86fbSStefan Hajnoczi if (local_error) { 1840d9d86fbSStefan Hajnoczi error_propagate(errp, local_error); 1850d9d86fbSStefan Hajnoczi aio_context_unref(iothread->ctx); 1860d9d86fbSStefan Hajnoczi iothread->ctx = NULL; 1870d9d86fbSStefan Hajnoczi return; 1880d9d86fbSStefan Hajnoczi } 1890d9d86fbSStefan Hajnoczi 190be8d8537SStefan Hajnoczi /* This assumes we are called from a thread with useful CPU affinity for us 191be8d8537SStefan Hajnoczi * to inherit. 192be8d8537SStefan Hajnoczi */ 193d21e8776SPaolo Bonzini name = object_get_canonical_path_component(OBJECT(obj)); 194d21e8776SPaolo Bonzini thread_name = g_strdup_printf("IO %s", name); 195d21e8776SPaolo Bonzini qemu_thread_create(&iothread->thread, thread_name, iothread_run, 196be8d8537SStefan Hajnoczi iothread, QEMU_THREAD_JOINABLE); 197d21e8776SPaolo Bonzini g_free(thread_name); 198d21e8776SPaolo Bonzini g_free(name); 19988eb7c29SStefan Hajnoczi 20088eb7c29SStefan Hajnoczi /* Wait for initialization to complete */ 20188eb7c29SStefan Hajnoczi while (iothread->thread_id == -1) { 20221c4d15bSPeter Xu qemu_sem_wait(&iothread->init_done_sem); 20388eb7c29SStefan Hajnoczi } 204be8d8537SStefan Hajnoczi } 205be8d8537SStefan Hajnoczi 2065e5db499SStefan Hajnoczi typedef struct { 2075e5db499SStefan Hajnoczi const char *name; 2085e5db499SStefan Hajnoczi ptrdiff_t offset; /* field's byte offset in IOThread struct */ 2095e5db499SStefan Hajnoczi } PollParamInfo; 2105e5db499SStefan Hajnoczi 2115e5db499SStefan Hajnoczi static PollParamInfo poll_max_ns_info = { 2125e5db499SStefan Hajnoczi "poll-max-ns", offsetof(IOThread, poll_max_ns), 2135e5db499SStefan Hajnoczi }; 2145e5db499SStefan Hajnoczi static PollParamInfo poll_grow_info = { 2155e5db499SStefan Hajnoczi "poll-grow", offsetof(IOThread, poll_grow), 2165e5db499SStefan Hajnoczi }; 2175e5db499SStefan Hajnoczi static PollParamInfo poll_shrink_info = { 2185e5db499SStefan Hajnoczi "poll-shrink", offsetof(IOThread, poll_shrink), 2195e5db499SStefan Hajnoczi }; 2205e5db499SStefan Hajnoczi 2215e5db499SStefan Hajnoczi static void iothread_get_poll_param(Object *obj, Visitor *v, 2220d9d86fbSStefan Hajnoczi const char *name, void *opaque, Error **errp) 2230d9d86fbSStefan Hajnoczi { 2240d9d86fbSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 2255e5db499SStefan Hajnoczi PollParamInfo *info = opaque; 2265e5db499SStefan Hajnoczi int64_t *field = (void *)iothread + info->offset; 2270d9d86fbSStefan Hajnoczi 2285e5db499SStefan Hajnoczi visit_type_int64(v, name, field, errp); 2290d9d86fbSStefan Hajnoczi } 2300d9d86fbSStefan Hajnoczi 2315e5db499SStefan Hajnoczi static void iothread_set_poll_param(Object *obj, Visitor *v, 2320d9d86fbSStefan Hajnoczi const char *name, void *opaque, Error **errp) 2330d9d86fbSStefan Hajnoczi { 2340d9d86fbSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 2355e5db499SStefan Hajnoczi PollParamInfo *info = opaque; 2365e5db499SStefan Hajnoczi int64_t *field = (void *)iothread + info->offset; 2370d9d86fbSStefan Hajnoczi Error *local_err = NULL; 2380d9d86fbSStefan Hajnoczi int64_t value; 2390d9d86fbSStefan Hajnoczi 2400d9d86fbSStefan Hajnoczi visit_type_int64(v, name, &value, &local_err); 2410d9d86fbSStefan Hajnoczi if (local_err) { 2420d9d86fbSStefan Hajnoczi goto out; 2430d9d86fbSStefan Hajnoczi } 2440d9d86fbSStefan Hajnoczi 2450d9d86fbSStefan Hajnoczi if (value < 0) { 2465e5db499SStefan Hajnoczi error_setg(&local_err, "%s value must be in range [0, %"PRId64"]", 2475e5db499SStefan Hajnoczi info->name, INT64_MAX); 2480d9d86fbSStefan Hajnoczi goto out; 2490d9d86fbSStefan Hajnoczi } 2500d9d86fbSStefan Hajnoczi 2515e5db499SStefan Hajnoczi *field = value; 2520d9d86fbSStefan Hajnoczi 2530d9d86fbSStefan Hajnoczi if (iothread->ctx) { 2545e5db499SStefan Hajnoczi aio_context_set_poll_params(iothread->ctx, 2555e5db499SStefan Hajnoczi iothread->poll_max_ns, 2565e5db499SStefan Hajnoczi iothread->poll_grow, 2575e5db499SStefan Hajnoczi iothread->poll_shrink, 2585e5db499SStefan Hajnoczi &local_err); 2590d9d86fbSStefan Hajnoczi } 2600d9d86fbSStefan Hajnoczi 2610d9d86fbSStefan Hajnoczi out: 2620d9d86fbSStefan Hajnoczi error_propagate(errp, local_err); 2630d9d86fbSStefan Hajnoczi } 2640d9d86fbSStefan Hajnoczi 265be8d8537SStefan Hajnoczi static void iothread_class_init(ObjectClass *klass, void *class_data) 266be8d8537SStefan Hajnoczi { 267be8d8537SStefan Hajnoczi UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass); 268be8d8537SStefan Hajnoczi ucc->complete = iothread_complete; 2690d9d86fbSStefan Hajnoczi 2700d9d86fbSStefan Hajnoczi object_class_property_add(klass, "poll-max-ns", "int", 2715e5db499SStefan Hajnoczi iothread_get_poll_param, 2725e5db499SStefan Hajnoczi iothread_set_poll_param, 2735e5db499SStefan Hajnoczi NULL, &poll_max_ns_info, &error_abort); 2745e5db499SStefan Hajnoczi object_class_property_add(klass, "poll-grow", "int", 2755e5db499SStefan Hajnoczi iothread_get_poll_param, 2765e5db499SStefan Hajnoczi iothread_set_poll_param, 2775e5db499SStefan Hajnoczi NULL, &poll_grow_info, &error_abort); 2785e5db499SStefan Hajnoczi object_class_property_add(klass, "poll-shrink", "int", 2795e5db499SStefan Hajnoczi iothread_get_poll_param, 2805e5db499SStefan Hajnoczi iothread_set_poll_param, 2815e5db499SStefan Hajnoczi NULL, &poll_shrink_info, &error_abort); 282be8d8537SStefan Hajnoczi } 283be8d8537SStefan Hajnoczi 284be8d8537SStefan Hajnoczi static const TypeInfo iothread_info = { 285be8d8537SStefan Hajnoczi .name = TYPE_IOTHREAD, 286be8d8537SStefan Hajnoczi .parent = TYPE_OBJECT, 287be8d8537SStefan Hajnoczi .class_init = iothread_class_init, 288be8d8537SStefan Hajnoczi .instance_size = sizeof(IOThread), 289cdd7abfdSStefan Hajnoczi .instance_init = iothread_instance_init, 290be8d8537SStefan Hajnoczi .instance_finalize = iothread_instance_finalize, 291be8d8537SStefan Hajnoczi .interfaces = (InterfaceInfo[]) { 292be8d8537SStefan Hajnoczi {TYPE_USER_CREATABLE}, 293be8d8537SStefan Hajnoczi {} 294be8d8537SStefan Hajnoczi }, 295be8d8537SStefan Hajnoczi }; 296be8d8537SStefan Hajnoczi 297be8d8537SStefan Hajnoczi static void iothread_register_types(void) 298be8d8537SStefan Hajnoczi { 299be8d8537SStefan Hajnoczi type_register_static(&iothread_info); 300be8d8537SStefan Hajnoczi } 301be8d8537SStefan Hajnoczi 302be8d8537SStefan Hajnoczi type_init(iothread_register_types) 303be8d8537SStefan Hajnoczi 304be8d8537SStefan Hajnoczi char *iothread_get_id(IOThread *iothread) 305be8d8537SStefan Hajnoczi { 306be8d8537SStefan Hajnoczi return object_get_canonical_path_component(OBJECT(iothread)); 307be8d8537SStefan Hajnoczi } 308be8d8537SStefan Hajnoczi 309be8d8537SStefan Hajnoczi AioContext *iothread_get_aio_context(IOThread *iothread) 310be8d8537SStefan Hajnoczi { 311be8d8537SStefan Hajnoczi return iothread->ctx; 312be8d8537SStefan Hajnoczi } 313dc3dd0d2SStefan Hajnoczi 314dc3dd0d2SStefan Hajnoczi static int query_one_iothread(Object *object, void *opaque) 315dc3dd0d2SStefan Hajnoczi { 316dc3dd0d2SStefan Hajnoczi IOThreadInfoList ***prev = opaque; 317dc3dd0d2SStefan Hajnoczi IOThreadInfoList *elem; 318dc3dd0d2SStefan Hajnoczi IOThreadInfo *info; 319dc3dd0d2SStefan Hajnoczi IOThread *iothread; 320dc3dd0d2SStefan Hajnoczi 321dc3dd0d2SStefan Hajnoczi iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); 322dc3dd0d2SStefan Hajnoczi if (!iothread) { 323dc3dd0d2SStefan Hajnoczi return 0; 324dc3dd0d2SStefan Hajnoczi } 325dc3dd0d2SStefan Hajnoczi 326dc3dd0d2SStefan Hajnoczi info = g_new0(IOThreadInfo, 1); 327dc3dd0d2SStefan Hajnoczi info->id = iothread_get_id(iothread); 328dc3dd0d2SStefan Hajnoczi info->thread_id = iothread->thread_id; 3295fc00480SPavel Hrdina info->poll_max_ns = iothread->poll_max_ns; 3305fc00480SPavel Hrdina info->poll_grow = iothread->poll_grow; 3315fc00480SPavel Hrdina info->poll_shrink = iothread->poll_shrink; 332dc3dd0d2SStefan Hajnoczi 333dc3dd0d2SStefan Hajnoczi elem = g_new0(IOThreadInfoList, 1); 334dc3dd0d2SStefan Hajnoczi elem->value = info; 335dc3dd0d2SStefan Hajnoczi elem->next = NULL; 336dc3dd0d2SStefan Hajnoczi 337dc3dd0d2SStefan Hajnoczi **prev = elem; 338dc3dd0d2SStefan Hajnoczi *prev = &elem->next; 339dc3dd0d2SStefan Hajnoczi return 0; 340dc3dd0d2SStefan Hajnoczi } 341dc3dd0d2SStefan Hajnoczi 342dc3dd0d2SStefan Hajnoczi IOThreadInfoList *qmp_query_iothreads(Error **errp) 343dc3dd0d2SStefan Hajnoczi { 344dc3dd0d2SStefan Hajnoczi IOThreadInfoList *head = NULL; 345dc3dd0d2SStefan Hajnoczi IOThreadInfoList **prev = &head; 346bc2256c4SDaniel P. Berrange Object *container = object_get_objects_root(); 347dc3dd0d2SStefan Hajnoczi 348dc3dd0d2SStefan Hajnoczi object_child_foreach(container, query_one_iothread, &prev); 349dc3dd0d2SStefan Hajnoczi return head; 350dc3dd0d2SStefan Hajnoczi } 351dce8921bSFam Zheng 352329163cbSWang Yong GMainContext *iothread_get_g_main_context(IOThread *iothread) 353329163cbSWang Yong { 354*b506e0f1SPeter Xu atomic_set(&iothread->run_gcontext, 1); 355*b506e0f1SPeter Xu aio_notify(iothread->ctx); 356329163cbSWang Yong return iothread->worker_context; 357329163cbSWang Yong } 3580173e21bSPeter Xu 3590173e21bSPeter Xu IOThread *iothread_create(const char *id, Error **errp) 3600173e21bSPeter Xu { 3610173e21bSPeter Xu Object *obj; 3620173e21bSPeter Xu 3630173e21bSPeter Xu obj = object_new_with_props(TYPE_IOTHREAD, 3640173e21bSPeter Xu object_get_internal_root(), 3650173e21bSPeter Xu id, errp, NULL); 3660173e21bSPeter Xu 3670173e21bSPeter Xu return IOTHREAD(obj); 3680173e21bSPeter Xu } 3690173e21bSPeter Xu 3700173e21bSPeter Xu void iothread_destroy(IOThread *iothread) 3710173e21bSPeter Xu { 3720173e21bSPeter Xu object_unparent(OBJECT(iothread)); 3730173e21bSPeter Xu } 374fbcc6923SStefan Hajnoczi 375fbcc6923SStefan Hajnoczi /* Lookup IOThread by its id. Only finds user-created objects, not internal 376fbcc6923SStefan Hajnoczi * iothread_create() objects. */ 377fbcc6923SStefan Hajnoczi IOThread *iothread_by_id(const char *id) 378fbcc6923SStefan Hajnoczi { 379fbcc6923SStefan Hajnoczi return IOTHREAD(object_resolve_path_type(id, TYPE_IOTHREAD, NULL)); 380fbcc6923SStefan Hajnoczi } 381