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" 22*112ed241SMarkus 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 34cdd7abfdSStefan Hajnoczi /* Benchmark results from 2016 on NVMe SSD drives show max polling times around 35cdd7abfdSStefan Hajnoczi * 16-32 microseconds yield IOPS improvements for both iodepth=1 and iodepth=32 36cdd7abfdSStefan Hajnoczi * workloads. 37cdd7abfdSStefan Hajnoczi */ 38cdd7abfdSStefan Hajnoczi #define IOTHREAD_POLL_MAX_NS_DEFAULT 32768ULL 39cdd7abfdSStefan Hajnoczi 40e4370165SPaolo Bonzini static __thread IOThread *my_iothread; 41e4370165SPaolo Bonzini 42e4370165SPaolo Bonzini AioContext *qemu_get_current_aio_context(void) 43e4370165SPaolo Bonzini { 44e4370165SPaolo Bonzini return my_iothread ? my_iothread->ctx : qemu_get_aio_context(); 45e4370165SPaolo Bonzini } 46e4370165SPaolo Bonzini 47be8d8537SStefan Hajnoczi static void *iothread_run(void *opaque) 48be8d8537SStefan Hajnoczi { 49be8d8537SStefan Hajnoczi IOThread *iothread = opaque; 50be8d8537SStefan Hajnoczi 51ab28bd23SPaolo Bonzini rcu_register_thread(); 52ab28bd23SPaolo Bonzini 53e4370165SPaolo Bonzini my_iothread = iothread; 5488eb7c29SStefan Hajnoczi qemu_mutex_lock(&iothread->init_done_lock); 5588eb7c29SStefan Hajnoczi iothread->thread_id = qemu_get_thread_id(); 5688eb7c29SStefan Hajnoczi qemu_cond_signal(&iothread->init_done_cond); 5788eb7c29SStefan Hajnoczi qemu_mutex_unlock(&iothread->init_done_lock); 5888eb7c29SStefan Hajnoczi 592362a28eSStefan Hajnoczi while (iothread->running) { 6065c1b5b6SPaolo Bonzini aio_poll(iothread->ctx, true); 61329163cbSWang Yong 62329163cbSWang Yong if (atomic_read(&iothread->worker_context)) { 63329163cbSWang Yong GMainLoop *loop; 64329163cbSWang Yong 65329163cbSWang Yong g_main_context_push_thread_default(iothread->worker_context); 66329163cbSWang Yong iothread->main_loop = 67329163cbSWang Yong g_main_loop_new(iothread->worker_context, TRUE); 68329163cbSWang Yong loop = iothread->main_loop; 69329163cbSWang Yong 70329163cbSWang Yong g_main_loop_run(iothread->main_loop); 71329163cbSWang Yong iothread->main_loop = NULL; 72329163cbSWang Yong g_main_loop_unref(loop); 73329163cbSWang Yong 74329163cbSWang Yong g_main_context_pop_thread_default(iothread->worker_context); 75329163cbSWang Yong } 76be8d8537SStefan Hajnoczi } 77ab28bd23SPaolo Bonzini 78ab28bd23SPaolo Bonzini rcu_unregister_thread(); 79be8d8537SStefan Hajnoczi return NULL; 80be8d8537SStefan Hajnoczi } 81be8d8537SStefan Hajnoczi 822362a28eSStefan Hajnoczi /* Runs in iothread_run() thread */ 832362a28eSStefan Hajnoczi static void iothread_stop_bh(void *opaque) 842362a28eSStefan Hajnoczi { 852362a28eSStefan Hajnoczi IOThread *iothread = opaque; 862362a28eSStefan Hajnoczi 872362a28eSStefan Hajnoczi iothread->running = false; /* stop iothread_run() */ 882362a28eSStefan Hajnoczi 892362a28eSStefan Hajnoczi if (iothread->main_loop) { 902362a28eSStefan Hajnoczi g_main_loop_quit(iothread->main_loop); 912362a28eSStefan Hajnoczi } 922362a28eSStefan Hajnoczi } 932362a28eSStefan Hajnoczi 9482d90705SPeter Xu void iothread_stop(IOThread *iothread) 95be8d8537SStefan Hajnoczi { 9682d90705SPeter Xu if (!iothread->ctx || iothread->stopping) { 9782d90705SPeter Xu return; 982f78e491SChrysostomos Nanakos } 99be8d8537SStefan Hajnoczi iothread->stopping = true; 1002362a28eSStefan Hajnoczi aio_bh_schedule_oneshot(iothread->ctx, iothread_stop_bh, iothread); 101be8d8537SStefan Hajnoczi qemu_thread_join(&iothread->thread); 10282d90705SPeter Xu } 10382d90705SPeter Xu 10482d90705SPeter Xu static int iothread_stop_iter(Object *object, void *opaque) 10582d90705SPeter Xu { 10682d90705SPeter Xu IOThread *iothread; 10782d90705SPeter Xu 10882d90705SPeter Xu iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); 10982d90705SPeter Xu if (!iothread) { 11082d90705SPeter Xu return 0; 11182d90705SPeter Xu } 11282d90705SPeter Xu iothread_stop(iothread); 113dce8921bSFam Zheng return 0; 114dce8921bSFam Zheng } 115dce8921bSFam Zheng 116cdd7abfdSStefan Hajnoczi static void iothread_instance_init(Object *obj) 117cdd7abfdSStefan Hajnoczi { 118cdd7abfdSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 119cdd7abfdSStefan Hajnoczi 120cdd7abfdSStefan Hajnoczi iothread->poll_max_ns = IOTHREAD_POLL_MAX_NS_DEFAULT; 121cdd7abfdSStefan Hajnoczi } 122cdd7abfdSStefan Hajnoczi 123dce8921bSFam Zheng static void iothread_instance_finalize(Object *obj) 124dce8921bSFam Zheng { 125dce8921bSFam Zheng IOThread *iothread = IOTHREAD(obj); 126dce8921bSFam Zheng 12782d90705SPeter Xu iothread_stop(iothread); 1285b3ac23fSPeter Xu if (iothread->worker_context) { 1295b3ac23fSPeter Xu g_main_context_unref(iothread->worker_context); 1305b3ac23fSPeter Xu iothread->worker_context = NULL; 1315b3ac23fSPeter Xu } 13288eb7c29SStefan Hajnoczi qemu_cond_destroy(&iothread->init_done_cond); 13388eb7c29SStefan Hajnoczi qemu_mutex_destroy(&iothread->init_done_lock); 134eb7b5c35SLin Ma if (!iothread->ctx) { 135eb7b5c35SLin Ma return; 136eb7b5c35SLin Ma } 137be8d8537SStefan Hajnoczi aio_context_unref(iothread->ctx); 138be8d8537SStefan Hajnoczi } 139be8d8537SStefan Hajnoczi 140be8d8537SStefan Hajnoczi static void iothread_complete(UserCreatable *obj, Error **errp) 141be8d8537SStefan Hajnoczi { 1422f78e491SChrysostomos Nanakos Error *local_error = NULL; 143be8d8537SStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 144d21e8776SPaolo Bonzini char *name, *thread_name; 145be8d8537SStefan Hajnoczi 146be8d8537SStefan Hajnoczi iothread->stopping = false; 1472362a28eSStefan Hajnoczi iothread->running = true; 14888eb7c29SStefan Hajnoczi iothread->thread_id = -1; 1492f78e491SChrysostomos Nanakos iothread->ctx = aio_context_new(&local_error); 1502f78e491SChrysostomos Nanakos if (!iothread->ctx) { 1512f78e491SChrysostomos Nanakos error_propagate(errp, local_error); 1522f78e491SChrysostomos Nanakos return; 1532f78e491SChrysostomos Nanakos } 15488eb7c29SStefan Hajnoczi 1555e5db499SStefan Hajnoczi aio_context_set_poll_params(iothread->ctx, 1565e5db499SStefan Hajnoczi iothread->poll_max_ns, 1575e5db499SStefan Hajnoczi iothread->poll_grow, 1585e5db499SStefan Hajnoczi iothread->poll_shrink, 1590d9d86fbSStefan Hajnoczi &local_error); 1600d9d86fbSStefan Hajnoczi if (local_error) { 1610d9d86fbSStefan Hajnoczi error_propagate(errp, local_error); 1620d9d86fbSStefan Hajnoczi aio_context_unref(iothread->ctx); 1630d9d86fbSStefan Hajnoczi iothread->ctx = NULL; 1640d9d86fbSStefan Hajnoczi return; 1650d9d86fbSStefan Hajnoczi } 1660d9d86fbSStefan Hajnoczi 16788eb7c29SStefan Hajnoczi qemu_mutex_init(&iothread->init_done_lock); 16888eb7c29SStefan Hajnoczi qemu_cond_init(&iothread->init_done_cond); 169329163cbSWang Yong iothread->once = (GOnce) G_ONCE_INIT; 170be8d8537SStefan Hajnoczi 171be8d8537SStefan Hajnoczi /* This assumes we are called from a thread with useful CPU affinity for us 172be8d8537SStefan Hajnoczi * to inherit. 173be8d8537SStefan Hajnoczi */ 174d21e8776SPaolo Bonzini name = object_get_canonical_path_component(OBJECT(obj)); 175d21e8776SPaolo Bonzini thread_name = g_strdup_printf("IO %s", name); 176d21e8776SPaolo Bonzini qemu_thread_create(&iothread->thread, thread_name, iothread_run, 177be8d8537SStefan Hajnoczi iothread, QEMU_THREAD_JOINABLE); 178d21e8776SPaolo Bonzini g_free(thread_name); 179d21e8776SPaolo Bonzini g_free(name); 18088eb7c29SStefan Hajnoczi 18188eb7c29SStefan Hajnoczi /* Wait for initialization to complete */ 18288eb7c29SStefan Hajnoczi qemu_mutex_lock(&iothread->init_done_lock); 18388eb7c29SStefan Hajnoczi while (iothread->thread_id == -1) { 18488eb7c29SStefan Hajnoczi qemu_cond_wait(&iothread->init_done_cond, 18588eb7c29SStefan Hajnoczi &iothread->init_done_lock); 18688eb7c29SStefan Hajnoczi } 18788eb7c29SStefan Hajnoczi qemu_mutex_unlock(&iothread->init_done_lock); 188be8d8537SStefan Hajnoczi } 189be8d8537SStefan Hajnoczi 1905e5db499SStefan Hajnoczi typedef struct { 1915e5db499SStefan Hajnoczi const char *name; 1925e5db499SStefan Hajnoczi ptrdiff_t offset; /* field's byte offset in IOThread struct */ 1935e5db499SStefan Hajnoczi } PollParamInfo; 1945e5db499SStefan Hajnoczi 1955e5db499SStefan Hajnoczi static PollParamInfo poll_max_ns_info = { 1965e5db499SStefan Hajnoczi "poll-max-ns", offsetof(IOThread, poll_max_ns), 1975e5db499SStefan Hajnoczi }; 1985e5db499SStefan Hajnoczi static PollParamInfo poll_grow_info = { 1995e5db499SStefan Hajnoczi "poll-grow", offsetof(IOThread, poll_grow), 2005e5db499SStefan Hajnoczi }; 2015e5db499SStefan Hajnoczi static PollParamInfo poll_shrink_info = { 2025e5db499SStefan Hajnoczi "poll-shrink", offsetof(IOThread, poll_shrink), 2035e5db499SStefan Hajnoczi }; 2045e5db499SStefan Hajnoczi 2055e5db499SStefan Hajnoczi static void iothread_get_poll_param(Object *obj, Visitor *v, 2060d9d86fbSStefan Hajnoczi const char *name, void *opaque, Error **errp) 2070d9d86fbSStefan Hajnoczi { 2080d9d86fbSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 2095e5db499SStefan Hajnoczi PollParamInfo *info = opaque; 2105e5db499SStefan Hajnoczi int64_t *field = (void *)iothread + info->offset; 2110d9d86fbSStefan Hajnoczi 2125e5db499SStefan Hajnoczi visit_type_int64(v, name, field, errp); 2130d9d86fbSStefan Hajnoczi } 2140d9d86fbSStefan Hajnoczi 2155e5db499SStefan Hajnoczi static void iothread_set_poll_param(Object *obj, Visitor *v, 2160d9d86fbSStefan Hajnoczi const char *name, void *opaque, Error **errp) 2170d9d86fbSStefan Hajnoczi { 2180d9d86fbSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 2195e5db499SStefan Hajnoczi PollParamInfo *info = opaque; 2205e5db499SStefan Hajnoczi int64_t *field = (void *)iothread + info->offset; 2210d9d86fbSStefan Hajnoczi Error *local_err = NULL; 2220d9d86fbSStefan Hajnoczi int64_t value; 2230d9d86fbSStefan Hajnoczi 2240d9d86fbSStefan Hajnoczi visit_type_int64(v, name, &value, &local_err); 2250d9d86fbSStefan Hajnoczi if (local_err) { 2260d9d86fbSStefan Hajnoczi goto out; 2270d9d86fbSStefan Hajnoczi } 2280d9d86fbSStefan Hajnoczi 2290d9d86fbSStefan Hajnoczi if (value < 0) { 2305e5db499SStefan Hajnoczi error_setg(&local_err, "%s value must be in range [0, %"PRId64"]", 2315e5db499SStefan Hajnoczi info->name, INT64_MAX); 2320d9d86fbSStefan Hajnoczi goto out; 2330d9d86fbSStefan Hajnoczi } 2340d9d86fbSStefan Hajnoczi 2355e5db499SStefan Hajnoczi *field = value; 2360d9d86fbSStefan Hajnoczi 2370d9d86fbSStefan Hajnoczi if (iothread->ctx) { 2385e5db499SStefan Hajnoczi aio_context_set_poll_params(iothread->ctx, 2395e5db499SStefan Hajnoczi iothread->poll_max_ns, 2405e5db499SStefan Hajnoczi iothread->poll_grow, 2415e5db499SStefan Hajnoczi iothread->poll_shrink, 2425e5db499SStefan Hajnoczi &local_err); 2430d9d86fbSStefan Hajnoczi } 2440d9d86fbSStefan Hajnoczi 2450d9d86fbSStefan Hajnoczi out: 2460d9d86fbSStefan Hajnoczi error_propagate(errp, local_err); 2470d9d86fbSStefan Hajnoczi } 2480d9d86fbSStefan Hajnoczi 249be8d8537SStefan Hajnoczi static void iothread_class_init(ObjectClass *klass, void *class_data) 250be8d8537SStefan Hajnoczi { 251be8d8537SStefan Hajnoczi UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass); 252be8d8537SStefan Hajnoczi ucc->complete = iothread_complete; 2530d9d86fbSStefan Hajnoczi 2540d9d86fbSStefan Hajnoczi object_class_property_add(klass, "poll-max-ns", "int", 2555e5db499SStefan Hajnoczi iothread_get_poll_param, 2565e5db499SStefan Hajnoczi iothread_set_poll_param, 2575e5db499SStefan Hajnoczi NULL, &poll_max_ns_info, &error_abort); 2585e5db499SStefan Hajnoczi object_class_property_add(klass, "poll-grow", "int", 2595e5db499SStefan Hajnoczi iothread_get_poll_param, 2605e5db499SStefan Hajnoczi iothread_set_poll_param, 2615e5db499SStefan Hajnoczi NULL, &poll_grow_info, &error_abort); 2625e5db499SStefan Hajnoczi object_class_property_add(klass, "poll-shrink", "int", 2635e5db499SStefan Hajnoczi iothread_get_poll_param, 2645e5db499SStefan Hajnoczi iothread_set_poll_param, 2655e5db499SStefan Hajnoczi NULL, &poll_shrink_info, &error_abort); 266be8d8537SStefan Hajnoczi } 267be8d8537SStefan Hajnoczi 268be8d8537SStefan Hajnoczi static const TypeInfo iothread_info = { 269be8d8537SStefan Hajnoczi .name = TYPE_IOTHREAD, 270be8d8537SStefan Hajnoczi .parent = TYPE_OBJECT, 271be8d8537SStefan Hajnoczi .class_init = iothread_class_init, 272be8d8537SStefan Hajnoczi .instance_size = sizeof(IOThread), 273cdd7abfdSStefan Hajnoczi .instance_init = iothread_instance_init, 274be8d8537SStefan Hajnoczi .instance_finalize = iothread_instance_finalize, 275be8d8537SStefan Hajnoczi .interfaces = (InterfaceInfo[]) { 276be8d8537SStefan Hajnoczi {TYPE_USER_CREATABLE}, 277be8d8537SStefan Hajnoczi {} 278be8d8537SStefan Hajnoczi }, 279be8d8537SStefan Hajnoczi }; 280be8d8537SStefan Hajnoczi 281be8d8537SStefan Hajnoczi static void iothread_register_types(void) 282be8d8537SStefan Hajnoczi { 283be8d8537SStefan Hajnoczi type_register_static(&iothread_info); 284be8d8537SStefan Hajnoczi } 285be8d8537SStefan Hajnoczi 286be8d8537SStefan Hajnoczi type_init(iothread_register_types) 287be8d8537SStefan Hajnoczi 288be8d8537SStefan Hajnoczi char *iothread_get_id(IOThread *iothread) 289be8d8537SStefan Hajnoczi { 290be8d8537SStefan Hajnoczi return object_get_canonical_path_component(OBJECT(iothread)); 291be8d8537SStefan Hajnoczi } 292be8d8537SStefan Hajnoczi 293be8d8537SStefan Hajnoczi AioContext *iothread_get_aio_context(IOThread *iothread) 294be8d8537SStefan Hajnoczi { 295be8d8537SStefan Hajnoczi return iothread->ctx; 296be8d8537SStefan Hajnoczi } 297dc3dd0d2SStefan Hajnoczi 298dc3dd0d2SStefan Hajnoczi static int query_one_iothread(Object *object, void *opaque) 299dc3dd0d2SStefan Hajnoczi { 300dc3dd0d2SStefan Hajnoczi IOThreadInfoList ***prev = opaque; 301dc3dd0d2SStefan Hajnoczi IOThreadInfoList *elem; 302dc3dd0d2SStefan Hajnoczi IOThreadInfo *info; 303dc3dd0d2SStefan Hajnoczi IOThread *iothread; 304dc3dd0d2SStefan Hajnoczi 305dc3dd0d2SStefan Hajnoczi iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); 306dc3dd0d2SStefan Hajnoczi if (!iothread) { 307dc3dd0d2SStefan Hajnoczi return 0; 308dc3dd0d2SStefan Hajnoczi } 309dc3dd0d2SStefan Hajnoczi 310dc3dd0d2SStefan Hajnoczi info = g_new0(IOThreadInfo, 1); 311dc3dd0d2SStefan Hajnoczi info->id = iothread_get_id(iothread); 312dc3dd0d2SStefan Hajnoczi info->thread_id = iothread->thread_id; 3135fc00480SPavel Hrdina info->poll_max_ns = iothread->poll_max_ns; 3145fc00480SPavel Hrdina info->poll_grow = iothread->poll_grow; 3155fc00480SPavel Hrdina info->poll_shrink = iothread->poll_shrink; 316dc3dd0d2SStefan Hajnoczi 317dc3dd0d2SStefan Hajnoczi elem = g_new0(IOThreadInfoList, 1); 318dc3dd0d2SStefan Hajnoczi elem->value = info; 319dc3dd0d2SStefan Hajnoczi elem->next = NULL; 320dc3dd0d2SStefan Hajnoczi 321dc3dd0d2SStefan Hajnoczi **prev = elem; 322dc3dd0d2SStefan Hajnoczi *prev = &elem->next; 323dc3dd0d2SStefan Hajnoczi return 0; 324dc3dd0d2SStefan Hajnoczi } 325dc3dd0d2SStefan Hajnoczi 326dc3dd0d2SStefan Hajnoczi IOThreadInfoList *qmp_query_iothreads(Error **errp) 327dc3dd0d2SStefan Hajnoczi { 328dc3dd0d2SStefan Hajnoczi IOThreadInfoList *head = NULL; 329dc3dd0d2SStefan Hajnoczi IOThreadInfoList **prev = &head; 330bc2256c4SDaniel P. Berrange Object *container = object_get_objects_root(); 331dc3dd0d2SStefan Hajnoczi 332dc3dd0d2SStefan Hajnoczi object_child_foreach(container, query_one_iothread, &prev); 333dc3dd0d2SStefan Hajnoczi return head; 334dc3dd0d2SStefan Hajnoczi } 335dce8921bSFam Zheng 336dce8921bSFam Zheng void iothread_stop_all(void) 337dce8921bSFam Zheng { 338dce8921bSFam Zheng Object *container = object_get_objects_root(); 339d16341faSPaolo Bonzini BlockDriverState *bs; 340d16341faSPaolo Bonzini BdrvNextIterator it; 341d16341faSPaolo Bonzini 342d16341faSPaolo Bonzini for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { 343d16341faSPaolo Bonzini AioContext *ctx = bdrv_get_aio_context(bs); 344d16341faSPaolo Bonzini if (ctx == qemu_get_aio_context()) { 345d16341faSPaolo Bonzini continue; 346d16341faSPaolo Bonzini } 347d16341faSPaolo Bonzini aio_context_acquire(ctx); 348d16341faSPaolo Bonzini bdrv_set_aio_context(bs, qemu_get_aio_context()); 349d16341faSPaolo Bonzini aio_context_release(ctx); 350d16341faSPaolo Bonzini } 351dce8921bSFam Zheng 35282d90705SPeter Xu object_child_foreach(container, iothread_stop_iter, NULL); 353dce8921bSFam Zheng } 354329163cbSWang Yong 355329163cbSWang Yong static gpointer iothread_g_main_context_init(gpointer opaque) 356329163cbSWang Yong { 357329163cbSWang Yong AioContext *ctx; 358329163cbSWang Yong IOThread *iothread = opaque; 359329163cbSWang Yong GSource *source; 360329163cbSWang Yong 361329163cbSWang Yong iothread->worker_context = g_main_context_new(); 362329163cbSWang Yong 363329163cbSWang Yong ctx = iothread_get_aio_context(iothread); 364329163cbSWang Yong source = aio_get_g_source(ctx); 365329163cbSWang Yong g_source_attach(source, iothread->worker_context); 366329163cbSWang Yong g_source_unref(source); 367329163cbSWang Yong 368329163cbSWang Yong aio_notify(iothread->ctx); 369329163cbSWang Yong return NULL; 370329163cbSWang Yong } 371329163cbSWang Yong 372329163cbSWang Yong GMainContext *iothread_get_g_main_context(IOThread *iothread) 373329163cbSWang Yong { 374329163cbSWang Yong g_once(&iothread->once, iothread_g_main_context_init, iothread); 375329163cbSWang Yong 376329163cbSWang Yong return iothread->worker_context; 377329163cbSWang Yong } 3780173e21bSPeter Xu 3790173e21bSPeter Xu IOThread *iothread_create(const char *id, Error **errp) 3800173e21bSPeter Xu { 3810173e21bSPeter Xu Object *obj; 3820173e21bSPeter Xu 3830173e21bSPeter Xu obj = object_new_with_props(TYPE_IOTHREAD, 3840173e21bSPeter Xu object_get_internal_root(), 3850173e21bSPeter Xu id, errp, NULL); 3860173e21bSPeter Xu 3870173e21bSPeter Xu return IOTHREAD(obj); 3880173e21bSPeter Xu } 3890173e21bSPeter Xu 3900173e21bSPeter Xu void iothread_destroy(IOThread *iothread) 3910173e21bSPeter Xu { 3920173e21bSPeter Xu object_unparent(OBJECT(iothread)); 3930173e21bSPeter Xu } 394fbcc6923SStefan Hajnoczi 395fbcc6923SStefan Hajnoczi /* Lookup IOThread by its id. Only finds user-created objects, not internal 396fbcc6923SStefan Hajnoczi * iothread_create() objects. */ 397fbcc6923SStefan Hajnoczi IOThread *iothread_by_id(const char *id) 398fbcc6923SStefan Hajnoczi { 399fbcc6923SStefan Hajnoczi return IOTHREAD(object_resolve_path_type(id, TYPE_IOTHREAD, NULL)); 400fbcc6923SStefan Hajnoczi } 401