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 58*2362a28eSStefan Hajnoczi while (iothread->running) { 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 } 75be8d8537SStefan Hajnoczi } 76ab28bd23SPaolo Bonzini 77ab28bd23SPaolo Bonzini rcu_unregister_thread(); 78be8d8537SStefan Hajnoczi return NULL; 79be8d8537SStefan Hajnoczi } 80be8d8537SStefan Hajnoczi 81*2362a28eSStefan Hajnoczi /* Runs in iothread_run() thread */ 82*2362a28eSStefan Hajnoczi static void iothread_stop_bh(void *opaque) 83*2362a28eSStefan Hajnoczi { 84*2362a28eSStefan Hajnoczi IOThread *iothread = opaque; 85*2362a28eSStefan Hajnoczi 86*2362a28eSStefan Hajnoczi iothread->running = false; /* stop iothread_run() */ 87*2362a28eSStefan Hajnoczi 88*2362a28eSStefan Hajnoczi if (iothread->main_loop) { 89*2362a28eSStefan Hajnoczi g_main_loop_quit(iothread->main_loop); 90*2362a28eSStefan Hajnoczi } 91*2362a28eSStefan Hajnoczi } 92*2362a28eSStefan Hajnoczi 9382d90705SPeter Xu void iothread_stop(IOThread *iothread) 94be8d8537SStefan Hajnoczi { 9582d90705SPeter Xu if (!iothread->ctx || iothread->stopping) { 9682d90705SPeter Xu return; 972f78e491SChrysostomos Nanakos } 98be8d8537SStefan Hajnoczi iothread->stopping = true; 99*2362a28eSStefan Hajnoczi aio_bh_schedule_oneshot(iothread->ctx, iothread_stop_bh, iothread); 100be8d8537SStefan Hajnoczi qemu_thread_join(&iothread->thread); 10182d90705SPeter Xu } 10282d90705SPeter Xu 10382d90705SPeter Xu static int iothread_stop_iter(Object *object, void *opaque) 10482d90705SPeter Xu { 10582d90705SPeter Xu IOThread *iothread; 10682d90705SPeter Xu 10782d90705SPeter Xu iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); 10882d90705SPeter Xu if (!iothread) { 10982d90705SPeter Xu return 0; 11082d90705SPeter Xu } 11182d90705SPeter Xu iothread_stop(iothread); 112dce8921bSFam Zheng return 0; 113dce8921bSFam Zheng } 114dce8921bSFam Zheng 115cdd7abfdSStefan Hajnoczi static void iothread_instance_init(Object *obj) 116cdd7abfdSStefan Hajnoczi { 117cdd7abfdSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 118cdd7abfdSStefan Hajnoczi 119cdd7abfdSStefan Hajnoczi iothread->poll_max_ns = IOTHREAD_POLL_MAX_NS_DEFAULT; 120cdd7abfdSStefan Hajnoczi } 121cdd7abfdSStefan Hajnoczi 122dce8921bSFam Zheng static void iothread_instance_finalize(Object *obj) 123dce8921bSFam Zheng { 124dce8921bSFam Zheng IOThread *iothread = IOTHREAD(obj); 125dce8921bSFam Zheng 12682d90705SPeter Xu iothread_stop(iothread); 1275b3ac23fSPeter Xu if (iothread->worker_context) { 1285b3ac23fSPeter Xu g_main_context_unref(iothread->worker_context); 1295b3ac23fSPeter Xu iothread->worker_context = NULL; 1305b3ac23fSPeter Xu } 13188eb7c29SStefan Hajnoczi qemu_cond_destroy(&iothread->init_done_cond); 13288eb7c29SStefan Hajnoczi qemu_mutex_destroy(&iothread->init_done_lock); 133eb7b5c35SLin Ma if (!iothread->ctx) { 134eb7b5c35SLin Ma return; 135eb7b5c35SLin Ma } 136be8d8537SStefan Hajnoczi aio_context_unref(iothread->ctx); 137be8d8537SStefan Hajnoczi } 138be8d8537SStefan Hajnoczi 139be8d8537SStefan Hajnoczi static void iothread_complete(UserCreatable *obj, Error **errp) 140be8d8537SStefan Hajnoczi { 1412f78e491SChrysostomos Nanakos Error *local_error = NULL; 142be8d8537SStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 143d21e8776SPaolo Bonzini char *name, *thread_name; 144be8d8537SStefan Hajnoczi 145be8d8537SStefan Hajnoczi iothread->stopping = false; 146*2362a28eSStefan Hajnoczi iothread->running = true; 14788eb7c29SStefan Hajnoczi iothread->thread_id = -1; 1482f78e491SChrysostomos Nanakos iothread->ctx = aio_context_new(&local_error); 1492f78e491SChrysostomos Nanakos if (!iothread->ctx) { 1502f78e491SChrysostomos Nanakos error_propagate(errp, local_error); 1512f78e491SChrysostomos Nanakos return; 1522f78e491SChrysostomos Nanakos } 15388eb7c29SStefan Hajnoczi 1545e5db499SStefan Hajnoczi aio_context_set_poll_params(iothread->ctx, 1555e5db499SStefan Hajnoczi iothread->poll_max_ns, 1565e5db499SStefan Hajnoczi iothread->poll_grow, 1575e5db499SStefan Hajnoczi iothread->poll_shrink, 1580d9d86fbSStefan Hajnoczi &local_error); 1590d9d86fbSStefan Hajnoczi if (local_error) { 1600d9d86fbSStefan Hajnoczi error_propagate(errp, local_error); 1610d9d86fbSStefan Hajnoczi aio_context_unref(iothread->ctx); 1620d9d86fbSStefan Hajnoczi iothread->ctx = NULL; 1630d9d86fbSStefan Hajnoczi return; 1640d9d86fbSStefan Hajnoczi } 1650d9d86fbSStefan Hajnoczi 16688eb7c29SStefan Hajnoczi qemu_mutex_init(&iothread->init_done_lock); 16788eb7c29SStefan Hajnoczi qemu_cond_init(&iothread->init_done_cond); 168329163cbSWang Yong iothread->once = (GOnce) G_ONCE_INIT; 169be8d8537SStefan Hajnoczi 170be8d8537SStefan Hajnoczi /* This assumes we are called from a thread with useful CPU affinity for us 171be8d8537SStefan Hajnoczi * to inherit. 172be8d8537SStefan Hajnoczi */ 173d21e8776SPaolo Bonzini name = object_get_canonical_path_component(OBJECT(obj)); 174d21e8776SPaolo Bonzini thread_name = g_strdup_printf("IO %s", name); 175d21e8776SPaolo Bonzini qemu_thread_create(&iothread->thread, thread_name, iothread_run, 176be8d8537SStefan Hajnoczi iothread, QEMU_THREAD_JOINABLE); 177d21e8776SPaolo Bonzini g_free(thread_name); 178d21e8776SPaolo Bonzini g_free(name); 17988eb7c29SStefan Hajnoczi 18088eb7c29SStefan Hajnoczi /* Wait for initialization to complete */ 18188eb7c29SStefan Hajnoczi qemu_mutex_lock(&iothread->init_done_lock); 18288eb7c29SStefan Hajnoczi while (iothread->thread_id == -1) { 18388eb7c29SStefan Hajnoczi qemu_cond_wait(&iothread->init_done_cond, 18488eb7c29SStefan Hajnoczi &iothread->init_done_lock); 18588eb7c29SStefan Hajnoczi } 18688eb7c29SStefan Hajnoczi qemu_mutex_unlock(&iothread->init_done_lock); 187be8d8537SStefan Hajnoczi } 188be8d8537SStefan Hajnoczi 1895e5db499SStefan Hajnoczi typedef struct { 1905e5db499SStefan Hajnoczi const char *name; 1915e5db499SStefan Hajnoczi ptrdiff_t offset; /* field's byte offset in IOThread struct */ 1925e5db499SStefan Hajnoczi } PollParamInfo; 1935e5db499SStefan Hajnoczi 1945e5db499SStefan Hajnoczi static PollParamInfo poll_max_ns_info = { 1955e5db499SStefan Hajnoczi "poll-max-ns", offsetof(IOThread, poll_max_ns), 1965e5db499SStefan Hajnoczi }; 1975e5db499SStefan Hajnoczi static PollParamInfo poll_grow_info = { 1985e5db499SStefan Hajnoczi "poll-grow", offsetof(IOThread, poll_grow), 1995e5db499SStefan Hajnoczi }; 2005e5db499SStefan Hajnoczi static PollParamInfo poll_shrink_info = { 2015e5db499SStefan Hajnoczi "poll-shrink", offsetof(IOThread, poll_shrink), 2025e5db499SStefan Hajnoczi }; 2035e5db499SStefan Hajnoczi 2045e5db499SStefan Hajnoczi static void iothread_get_poll_param(Object *obj, Visitor *v, 2050d9d86fbSStefan Hajnoczi const char *name, void *opaque, Error **errp) 2060d9d86fbSStefan Hajnoczi { 2070d9d86fbSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 2085e5db499SStefan Hajnoczi PollParamInfo *info = opaque; 2095e5db499SStefan Hajnoczi int64_t *field = (void *)iothread + info->offset; 2100d9d86fbSStefan Hajnoczi 2115e5db499SStefan Hajnoczi visit_type_int64(v, name, field, errp); 2120d9d86fbSStefan Hajnoczi } 2130d9d86fbSStefan Hajnoczi 2145e5db499SStefan Hajnoczi static void iothread_set_poll_param(Object *obj, Visitor *v, 2150d9d86fbSStefan Hajnoczi const char *name, void *opaque, Error **errp) 2160d9d86fbSStefan Hajnoczi { 2170d9d86fbSStefan Hajnoczi IOThread *iothread = IOTHREAD(obj); 2185e5db499SStefan Hajnoczi PollParamInfo *info = opaque; 2195e5db499SStefan Hajnoczi int64_t *field = (void *)iothread + info->offset; 2200d9d86fbSStefan Hajnoczi Error *local_err = NULL; 2210d9d86fbSStefan Hajnoczi int64_t value; 2220d9d86fbSStefan Hajnoczi 2230d9d86fbSStefan Hajnoczi visit_type_int64(v, name, &value, &local_err); 2240d9d86fbSStefan Hajnoczi if (local_err) { 2250d9d86fbSStefan Hajnoczi goto out; 2260d9d86fbSStefan Hajnoczi } 2270d9d86fbSStefan Hajnoczi 2280d9d86fbSStefan Hajnoczi if (value < 0) { 2295e5db499SStefan Hajnoczi error_setg(&local_err, "%s value must be in range [0, %"PRId64"]", 2305e5db499SStefan Hajnoczi info->name, INT64_MAX); 2310d9d86fbSStefan Hajnoczi goto out; 2320d9d86fbSStefan Hajnoczi } 2330d9d86fbSStefan Hajnoczi 2345e5db499SStefan Hajnoczi *field = value; 2350d9d86fbSStefan Hajnoczi 2360d9d86fbSStefan Hajnoczi if (iothread->ctx) { 2375e5db499SStefan Hajnoczi aio_context_set_poll_params(iothread->ctx, 2385e5db499SStefan Hajnoczi iothread->poll_max_ns, 2395e5db499SStefan Hajnoczi iothread->poll_grow, 2405e5db499SStefan Hajnoczi iothread->poll_shrink, 2415e5db499SStefan Hajnoczi &local_err); 2420d9d86fbSStefan Hajnoczi } 2430d9d86fbSStefan Hajnoczi 2440d9d86fbSStefan Hajnoczi out: 2450d9d86fbSStefan Hajnoczi error_propagate(errp, local_err); 2460d9d86fbSStefan Hajnoczi } 2470d9d86fbSStefan Hajnoczi 248be8d8537SStefan Hajnoczi static void iothread_class_init(ObjectClass *klass, void *class_data) 249be8d8537SStefan Hajnoczi { 250be8d8537SStefan Hajnoczi UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass); 251be8d8537SStefan Hajnoczi ucc->complete = iothread_complete; 2520d9d86fbSStefan Hajnoczi 2530d9d86fbSStefan Hajnoczi object_class_property_add(klass, "poll-max-ns", "int", 2545e5db499SStefan Hajnoczi iothread_get_poll_param, 2555e5db499SStefan Hajnoczi iothread_set_poll_param, 2565e5db499SStefan Hajnoczi NULL, &poll_max_ns_info, &error_abort); 2575e5db499SStefan Hajnoczi object_class_property_add(klass, "poll-grow", "int", 2585e5db499SStefan Hajnoczi iothread_get_poll_param, 2595e5db499SStefan Hajnoczi iothread_set_poll_param, 2605e5db499SStefan Hajnoczi NULL, &poll_grow_info, &error_abort); 2615e5db499SStefan Hajnoczi object_class_property_add(klass, "poll-shrink", "int", 2625e5db499SStefan Hajnoczi iothread_get_poll_param, 2635e5db499SStefan Hajnoczi iothread_set_poll_param, 2645e5db499SStefan Hajnoczi NULL, &poll_shrink_info, &error_abort); 265be8d8537SStefan Hajnoczi } 266be8d8537SStefan Hajnoczi 267be8d8537SStefan Hajnoczi static const TypeInfo iothread_info = { 268be8d8537SStefan Hajnoczi .name = TYPE_IOTHREAD, 269be8d8537SStefan Hajnoczi .parent = TYPE_OBJECT, 270be8d8537SStefan Hajnoczi .class_init = iothread_class_init, 271be8d8537SStefan Hajnoczi .instance_size = sizeof(IOThread), 272cdd7abfdSStefan Hajnoczi .instance_init = iothread_instance_init, 273be8d8537SStefan Hajnoczi .instance_finalize = iothread_instance_finalize, 274be8d8537SStefan Hajnoczi .interfaces = (InterfaceInfo[]) { 275be8d8537SStefan Hajnoczi {TYPE_USER_CREATABLE}, 276be8d8537SStefan Hajnoczi {} 277be8d8537SStefan Hajnoczi }, 278be8d8537SStefan Hajnoczi }; 279be8d8537SStefan Hajnoczi 280be8d8537SStefan Hajnoczi static void iothread_register_types(void) 281be8d8537SStefan Hajnoczi { 282be8d8537SStefan Hajnoczi type_register_static(&iothread_info); 283be8d8537SStefan Hajnoczi } 284be8d8537SStefan Hajnoczi 285be8d8537SStefan Hajnoczi type_init(iothread_register_types) 286be8d8537SStefan Hajnoczi 287be8d8537SStefan Hajnoczi char *iothread_get_id(IOThread *iothread) 288be8d8537SStefan Hajnoczi { 289be8d8537SStefan Hajnoczi return object_get_canonical_path_component(OBJECT(iothread)); 290be8d8537SStefan Hajnoczi } 291be8d8537SStefan Hajnoczi 292be8d8537SStefan Hajnoczi AioContext *iothread_get_aio_context(IOThread *iothread) 293be8d8537SStefan Hajnoczi { 294be8d8537SStefan Hajnoczi return iothread->ctx; 295be8d8537SStefan Hajnoczi } 296dc3dd0d2SStefan Hajnoczi 297dc3dd0d2SStefan Hajnoczi static int query_one_iothread(Object *object, void *opaque) 298dc3dd0d2SStefan Hajnoczi { 299dc3dd0d2SStefan Hajnoczi IOThreadInfoList ***prev = opaque; 300dc3dd0d2SStefan Hajnoczi IOThreadInfoList *elem; 301dc3dd0d2SStefan Hajnoczi IOThreadInfo *info; 302dc3dd0d2SStefan Hajnoczi IOThread *iothread; 303dc3dd0d2SStefan Hajnoczi 304dc3dd0d2SStefan Hajnoczi iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); 305dc3dd0d2SStefan Hajnoczi if (!iothread) { 306dc3dd0d2SStefan Hajnoczi return 0; 307dc3dd0d2SStefan Hajnoczi } 308dc3dd0d2SStefan Hajnoczi 309dc3dd0d2SStefan Hajnoczi info = g_new0(IOThreadInfo, 1); 310dc3dd0d2SStefan Hajnoczi info->id = iothread_get_id(iothread); 311dc3dd0d2SStefan Hajnoczi info->thread_id = iothread->thread_id; 3125fc00480SPavel Hrdina info->poll_max_ns = iothread->poll_max_ns; 3135fc00480SPavel Hrdina info->poll_grow = iothread->poll_grow; 3145fc00480SPavel Hrdina info->poll_shrink = iothread->poll_shrink; 315dc3dd0d2SStefan Hajnoczi 316dc3dd0d2SStefan Hajnoczi elem = g_new0(IOThreadInfoList, 1); 317dc3dd0d2SStefan Hajnoczi elem->value = info; 318dc3dd0d2SStefan Hajnoczi elem->next = NULL; 319dc3dd0d2SStefan Hajnoczi 320dc3dd0d2SStefan Hajnoczi **prev = elem; 321dc3dd0d2SStefan Hajnoczi *prev = &elem->next; 322dc3dd0d2SStefan Hajnoczi return 0; 323dc3dd0d2SStefan Hajnoczi } 324dc3dd0d2SStefan Hajnoczi 325dc3dd0d2SStefan Hajnoczi IOThreadInfoList *qmp_query_iothreads(Error **errp) 326dc3dd0d2SStefan Hajnoczi { 327dc3dd0d2SStefan Hajnoczi IOThreadInfoList *head = NULL; 328dc3dd0d2SStefan Hajnoczi IOThreadInfoList **prev = &head; 329bc2256c4SDaniel P. Berrange Object *container = object_get_objects_root(); 330dc3dd0d2SStefan Hajnoczi 331dc3dd0d2SStefan Hajnoczi object_child_foreach(container, query_one_iothread, &prev); 332dc3dd0d2SStefan Hajnoczi return head; 333dc3dd0d2SStefan Hajnoczi } 334dce8921bSFam Zheng 335dce8921bSFam Zheng void iothread_stop_all(void) 336dce8921bSFam Zheng { 337dce8921bSFam Zheng Object *container = object_get_objects_root(); 338d16341faSPaolo Bonzini BlockDriverState *bs; 339d16341faSPaolo Bonzini BdrvNextIterator it; 340d16341faSPaolo Bonzini 341d16341faSPaolo Bonzini for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { 342d16341faSPaolo Bonzini AioContext *ctx = bdrv_get_aio_context(bs); 343d16341faSPaolo Bonzini if (ctx == qemu_get_aio_context()) { 344d16341faSPaolo Bonzini continue; 345d16341faSPaolo Bonzini } 346d16341faSPaolo Bonzini aio_context_acquire(ctx); 347d16341faSPaolo Bonzini bdrv_set_aio_context(bs, qemu_get_aio_context()); 348d16341faSPaolo Bonzini aio_context_release(ctx); 349d16341faSPaolo Bonzini } 350dce8921bSFam Zheng 35182d90705SPeter Xu object_child_foreach(container, iothread_stop_iter, NULL); 352dce8921bSFam Zheng } 353329163cbSWang Yong 354329163cbSWang Yong static gpointer iothread_g_main_context_init(gpointer opaque) 355329163cbSWang Yong { 356329163cbSWang Yong AioContext *ctx; 357329163cbSWang Yong IOThread *iothread = opaque; 358329163cbSWang Yong GSource *source; 359329163cbSWang Yong 360329163cbSWang Yong iothread->worker_context = g_main_context_new(); 361329163cbSWang Yong 362329163cbSWang Yong ctx = iothread_get_aio_context(iothread); 363329163cbSWang Yong source = aio_get_g_source(ctx); 364329163cbSWang Yong g_source_attach(source, iothread->worker_context); 365329163cbSWang Yong g_source_unref(source); 366329163cbSWang Yong 367329163cbSWang Yong aio_notify(iothread->ctx); 368329163cbSWang Yong return NULL; 369329163cbSWang Yong } 370329163cbSWang Yong 371329163cbSWang Yong GMainContext *iothread_get_g_main_context(IOThread *iothread) 372329163cbSWang Yong { 373329163cbSWang Yong g_once(&iothread->once, iothread_g_main_context_init, iothread); 374329163cbSWang Yong 375329163cbSWang Yong return iothread->worker_context; 376329163cbSWang Yong } 3770173e21bSPeter Xu 3780173e21bSPeter Xu IOThread *iothread_create(const char *id, Error **errp) 3790173e21bSPeter Xu { 3800173e21bSPeter Xu Object *obj; 3810173e21bSPeter Xu 3820173e21bSPeter Xu obj = object_new_with_props(TYPE_IOTHREAD, 3830173e21bSPeter Xu object_get_internal_root(), 3840173e21bSPeter Xu id, errp, NULL); 3850173e21bSPeter Xu 3860173e21bSPeter Xu return IOTHREAD(obj); 3870173e21bSPeter Xu } 3880173e21bSPeter Xu 3890173e21bSPeter Xu void iothread_destroy(IOThread *iothread) 3900173e21bSPeter Xu { 3910173e21bSPeter Xu object_unparent(OBJECT(iothread)); 3920173e21bSPeter Xu } 393fbcc6923SStefan Hajnoczi 394fbcc6923SStefan Hajnoczi /* Lookup IOThread by its id. Only finds user-created objects, not internal 395fbcc6923SStefan Hajnoczi * iothread_create() objects. */ 396fbcc6923SStefan Hajnoczi IOThread *iothread_by_id(const char *id) 397fbcc6923SStefan Hajnoczi { 398fbcc6923SStefan Hajnoczi return IOTHREAD(object_resolve_path_type(id, TYPE_IOTHREAD, NULL)); 399fbcc6923SStefan Hajnoczi } 400