Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Event loop thread |
| 3 | * |
| 4 | * Copyright Red Hat Inc., 2013 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Stefan Hajnoczi <stefanha@redhat.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 10 | * See the COPYING file in the top-level directory. |
| 11 | * |
| 12 | */ |
| 13 | |
Peter Maydell | d38ea87 | 2016-01-29 17:50:05 +0000 | [diff] [blame] | 14 | #include "qemu/osdep.h" |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 15 | #include "qom/object.h" |
| 16 | #include "qom/object_interfaces.h" |
| 17 | #include "qemu/module.h" |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 18 | #include "block/aio.h" |
Paolo Bonzini | d16341f | 2016-10-27 12:49:00 +0200 | [diff] [blame] | 19 | #include "block/block.h" |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 20 | #include "sysemu/iothread.h" |
Markus Armbruster | e688df6 | 2018-02-01 12:18:31 +0100 | [diff] [blame] | 21 | #include "qapi/error.h" |
Markus Armbruster | 112ed24 | 2018-02-26 17:13:27 -0600 | [diff] [blame] | 22 | #include "qapi/qapi-commands-misc.h" |
Chrysostomos Nanakos | 2f78e49 | 2014-09-18 14:30:49 +0300 | [diff] [blame] | 23 | #include "qemu/error-report.h" |
Paolo Bonzini | ab28bd2 | 2015-07-09 08:55:38 +0200 | [diff] [blame] | 24 | #include "qemu/rcu.h" |
Paolo Bonzini | e437016 | 2016-10-27 12:48:59 +0200 | [diff] [blame] | 25 | #include "qemu/main-loop.h" |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 26 | |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 27 | typedef ObjectClass IOThreadClass; |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 28 | |
| 29 | #define IOTHREAD_GET_CLASS(obj) \ |
| 30 | OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD) |
| 31 | #define IOTHREAD_CLASS(klass) \ |
| 32 | OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD) |
| 33 | |
Peter Xu | 90c558b | 2018-03-22 16:56:30 +0800 | [diff] [blame] | 34 | #ifdef CONFIG_POSIX |
Stefan Hajnoczi | cdd7abf | 2017-01-26 17:01:19 +0000 | [diff] [blame] | 35 | /* Benchmark results from 2016 on NVMe SSD drives show max polling times around |
| 36 | * 16-32 microseconds yield IOPS improvements for both iodepth=1 and iodepth=32 |
| 37 | * workloads. |
| 38 | */ |
| 39 | #define IOTHREAD_POLL_MAX_NS_DEFAULT 32768ULL |
Peter Xu | 90c558b | 2018-03-22 16:56:30 +0800 | [diff] [blame] | 40 | #else |
| 41 | #define IOTHREAD_POLL_MAX_NS_DEFAULT 0ULL |
| 42 | #endif |
Stefan Hajnoczi | cdd7abf | 2017-01-26 17:01:19 +0000 | [diff] [blame] | 43 | |
Paolo Bonzini | e437016 | 2016-10-27 12:48:59 +0200 | [diff] [blame] | 44 | static __thread IOThread *my_iothread; |
| 45 | |
| 46 | AioContext *qemu_get_current_aio_context(void) |
| 47 | { |
| 48 | return my_iothread ? my_iothread->ctx : qemu_get_aio_context(); |
| 49 | } |
| 50 | |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 51 | static void *iothread_run(void *opaque) |
| 52 | { |
| 53 | IOThread *iothread = opaque; |
| 54 | |
Paolo Bonzini | ab28bd2 | 2015-07-09 08:55:38 +0200 | [diff] [blame] | 55 | rcu_register_thread(); |
| 56 | |
Paolo Bonzini | e437016 | 2016-10-27 12:48:59 +0200 | [diff] [blame] | 57 | my_iothread = iothread; |
Stefan Hajnoczi | 88eb7c2 | 2014-02-27 11:48:41 +0100 | [diff] [blame] | 58 | qemu_mutex_lock(&iothread->init_done_lock); |
| 59 | iothread->thread_id = qemu_get_thread_id(); |
| 60 | qemu_cond_signal(&iothread->init_done_cond); |
| 61 | qemu_mutex_unlock(&iothread->init_done_lock); |
| 62 | |
Stefan Hajnoczi | 2362a28 | 2017-12-07 20:13:19 +0000 | [diff] [blame] | 63 | while (iothread->running) { |
Paolo Bonzini | 65c1b5b | 2016-10-27 12:49:06 +0200 | [diff] [blame] | 64 | aio_poll(iothread->ctx, true); |
Wang Yong | 329163c | 2017-08-29 15:22:37 +0800 | [diff] [blame] | 65 | |
| 66 | if (atomic_read(&iothread->worker_context)) { |
| 67 | GMainLoop *loop; |
| 68 | |
| 69 | g_main_context_push_thread_default(iothread->worker_context); |
| 70 | iothread->main_loop = |
| 71 | g_main_loop_new(iothread->worker_context, TRUE); |
| 72 | loop = iothread->main_loop; |
| 73 | |
| 74 | g_main_loop_run(iothread->main_loop); |
| 75 | iothread->main_loop = NULL; |
| 76 | g_main_loop_unref(loop); |
| 77 | |
| 78 | g_main_context_pop_thread_default(iothread->worker_context); |
Wang Yong | 329163c | 2017-08-29 15:22:37 +0800 | [diff] [blame] | 79 | } |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 80 | } |
Paolo Bonzini | ab28bd2 | 2015-07-09 08:55:38 +0200 | [diff] [blame] | 81 | |
| 82 | rcu_unregister_thread(); |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 83 | return NULL; |
| 84 | } |
| 85 | |
Stefan Hajnoczi | 2362a28 | 2017-12-07 20:13:19 +0000 | [diff] [blame] | 86 | /* Runs in iothread_run() thread */ |
| 87 | static void iothread_stop_bh(void *opaque) |
| 88 | { |
| 89 | IOThread *iothread = opaque; |
| 90 | |
| 91 | iothread->running = false; /* stop iothread_run() */ |
| 92 | |
| 93 | if (iothread->main_loop) { |
| 94 | g_main_loop_quit(iothread->main_loop); |
| 95 | } |
| 96 | } |
| 97 | |
Peter Xu | 82d9070 | 2017-09-28 10:59:56 +0800 | [diff] [blame] | 98 | void iothread_stop(IOThread *iothread) |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 99 | { |
Peter Xu | 82d9070 | 2017-09-28 10:59:56 +0800 | [diff] [blame] | 100 | if (!iothread->ctx || iothread->stopping) { |
| 101 | return; |
Chrysostomos Nanakos | 2f78e49 | 2014-09-18 14:30:49 +0300 | [diff] [blame] | 102 | } |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 103 | iothread->stopping = true; |
Stefan Hajnoczi | 2362a28 | 2017-12-07 20:13:19 +0000 | [diff] [blame] | 104 | aio_bh_schedule_oneshot(iothread->ctx, iothread_stop_bh, iothread); |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 105 | qemu_thread_join(&iothread->thread); |
Peter Xu | 82d9070 | 2017-09-28 10:59:56 +0800 | [diff] [blame] | 106 | } |
| 107 | |
Stefan Hajnoczi | cdd7abf | 2017-01-26 17:01:19 +0000 | [diff] [blame] | 108 | static void iothread_instance_init(Object *obj) |
| 109 | { |
| 110 | IOThread *iothread = IOTHREAD(obj); |
| 111 | |
| 112 | iothread->poll_max_ns = IOTHREAD_POLL_MAX_NS_DEFAULT; |
| 113 | } |
| 114 | |
Fam Zheng | dce8921 | 2016-09-08 17:28:51 +0800 | [diff] [blame] | 115 | static void iothread_instance_finalize(Object *obj) |
| 116 | { |
| 117 | IOThread *iothread = IOTHREAD(obj); |
| 118 | |
Peter Xu | 82d9070 | 2017-09-28 10:59:56 +0800 | [diff] [blame] | 119 | iothread_stop(iothread); |
Peter Xu | 1554434 | 2018-04-09 16:39:56 +0800 | [diff] [blame] | 120 | /* |
| 121 | * Before glib2 2.33.10, there is a glib2 bug that GSource context |
| 122 | * pointer may not be cleared even if the context has already been |
| 123 | * destroyed (while it should). Here let's free the AIO context |
| 124 | * earlier to bypass that glib bug. |
| 125 | * |
| 126 | * We can remove this comment after the minimum supported glib2 |
| 127 | * version boosts to 2.33.10. Before that, let's free the |
| 128 | * GSources first before destroying any GMainContext. |
| 129 | */ |
| 130 | if (iothread->ctx) { |
| 131 | aio_context_unref(iothread->ctx); |
| 132 | iothread->ctx = NULL; |
| 133 | } |
Peter Xu | 5b3ac23 | 2017-09-28 10:59:57 +0800 | [diff] [blame] | 134 | if (iothread->worker_context) { |
| 135 | g_main_context_unref(iothread->worker_context); |
| 136 | iothread->worker_context = NULL; |
| 137 | } |
Stefan Hajnoczi | 88eb7c2 | 2014-02-27 11:48:41 +0100 | [diff] [blame] | 138 | qemu_cond_destroy(&iothread->init_done_cond); |
| 139 | qemu_mutex_destroy(&iothread->init_done_lock); |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | static void iothread_complete(UserCreatable *obj, Error **errp) |
| 143 | { |
Chrysostomos Nanakos | 2f78e49 | 2014-09-18 14:30:49 +0300 | [diff] [blame] | 144 | Error *local_error = NULL; |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 145 | IOThread *iothread = IOTHREAD(obj); |
Paolo Bonzini | d21e877 | 2015-11-24 14:46:44 +0100 | [diff] [blame] | 146 | char *name, *thread_name; |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 147 | |
| 148 | iothread->stopping = false; |
Stefan Hajnoczi | 2362a28 | 2017-12-07 20:13:19 +0000 | [diff] [blame] | 149 | iothread->running = true; |
Stefan Hajnoczi | 88eb7c2 | 2014-02-27 11:48:41 +0100 | [diff] [blame] | 150 | iothread->thread_id = -1; |
Chrysostomos Nanakos | 2f78e49 | 2014-09-18 14:30:49 +0300 | [diff] [blame] | 151 | iothread->ctx = aio_context_new(&local_error); |
| 152 | if (!iothread->ctx) { |
| 153 | error_propagate(errp, local_error); |
| 154 | return; |
| 155 | } |
Stefan Hajnoczi | 88eb7c2 | 2014-02-27 11:48:41 +0100 | [diff] [blame] | 156 | |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 157 | aio_context_set_poll_params(iothread->ctx, |
| 158 | iothread->poll_max_ns, |
| 159 | iothread->poll_grow, |
| 160 | iothread->poll_shrink, |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 161 | &local_error); |
| 162 | if (local_error) { |
| 163 | error_propagate(errp, local_error); |
| 164 | aio_context_unref(iothread->ctx); |
| 165 | iothread->ctx = NULL; |
| 166 | return; |
| 167 | } |
| 168 | |
Stefan Hajnoczi | 88eb7c2 | 2014-02-27 11:48:41 +0100 | [diff] [blame] | 169 | qemu_mutex_init(&iothread->init_done_lock); |
| 170 | qemu_cond_init(&iothread->init_done_cond); |
Wang Yong | 329163c | 2017-08-29 15:22:37 +0800 | [diff] [blame] | 171 | iothread->once = (GOnce) G_ONCE_INIT; |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 172 | |
| 173 | /* This assumes we are called from a thread with useful CPU affinity for us |
| 174 | * to inherit. |
| 175 | */ |
Paolo Bonzini | d21e877 | 2015-11-24 14:46:44 +0100 | [diff] [blame] | 176 | name = object_get_canonical_path_component(OBJECT(obj)); |
| 177 | thread_name = g_strdup_printf("IO %s", name); |
| 178 | qemu_thread_create(&iothread->thread, thread_name, iothread_run, |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 179 | iothread, QEMU_THREAD_JOINABLE); |
Paolo Bonzini | d21e877 | 2015-11-24 14:46:44 +0100 | [diff] [blame] | 180 | g_free(thread_name); |
| 181 | g_free(name); |
Stefan Hajnoczi | 88eb7c2 | 2014-02-27 11:48:41 +0100 | [diff] [blame] | 182 | |
| 183 | /* Wait for initialization to complete */ |
| 184 | qemu_mutex_lock(&iothread->init_done_lock); |
| 185 | while (iothread->thread_id == -1) { |
| 186 | qemu_cond_wait(&iothread->init_done_cond, |
| 187 | &iothread->init_done_lock); |
| 188 | } |
| 189 | qemu_mutex_unlock(&iothread->init_done_lock); |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 190 | } |
| 191 | |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 192 | typedef struct { |
| 193 | const char *name; |
| 194 | ptrdiff_t offset; /* field's byte offset in IOThread struct */ |
| 195 | } PollParamInfo; |
| 196 | |
| 197 | static PollParamInfo poll_max_ns_info = { |
| 198 | "poll-max-ns", offsetof(IOThread, poll_max_ns), |
| 199 | }; |
| 200 | static PollParamInfo poll_grow_info = { |
| 201 | "poll-grow", offsetof(IOThread, poll_grow), |
| 202 | }; |
| 203 | static PollParamInfo poll_shrink_info = { |
| 204 | "poll-shrink", offsetof(IOThread, poll_shrink), |
| 205 | }; |
| 206 | |
| 207 | static void iothread_get_poll_param(Object *obj, Visitor *v, |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 208 | const char *name, void *opaque, Error **errp) |
| 209 | { |
| 210 | IOThread *iothread = IOTHREAD(obj); |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 211 | PollParamInfo *info = opaque; |
| 212 | int64_t *field = (void *)iothread + info->offset; |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 213 | |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 214 | visit_type_int64(v, name, field, errp); |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 215 | } |
| 216 | |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 217 | static void iothread_set_poll_param(Object *obj, Visitor *v, |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 218 | const char *name, void *opaque, Error **errp) |
| 219 | { |
| 220 | IOThread *iothread = IOTHREAD(obj); |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 221 | PollParamInfo *info = opaque; |
| 222 | int64_t *field = (void *)iothread + info->offset; |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 223 | Error *local_err = NULL; |
| 224 | int64_t value; |
| 225 | |
| 226 | visit_type_int64(v, name, &value, &local_err); |
| 227 | if (local_err) { |
| 228 | goto out; |
| 229 | } |
| 230 | |
| 231 | if (value < 0) { |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 232 | error_setg(&local_err, "%s value must be in range [0, %"PRId64"]", |
| 233 | info->name, INT64_MAX); |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 234 | goto out; |
| 235 | } |
| 236 | |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 237 | *field = value; |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 238 | |
| 239 | if (iothread->ctx) { |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 240 | aio_context_set_poll_params(iothread->ctx, |
| 241 | iothread->poll_max_ns, |
| 242 | iothread->poll_grow, |
| 243 | iothread->poll_shrink, |
| 244 | &local_err); |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | out: |
| 248 | error_propagate(errp, local_err); |
| 249 | } |
| 250 | |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 251 | static void iothread_class_init(ObjectClass *klass, void *class_data) |
| 252 | { |
| 253 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass); |
| 254 | ucc->complete = iothread_complete; |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 255 | |
| 256 | object_class_property_add(klass, "poll-max-ns", "int", |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 257 | iothread_get_poll_param, |
| 258 | iothread_set_poll_param, |
| 259 | NULL, &poll_max_ns_info, &error_abort); |
| 260 | object_class_property_add(klass, "poll-grow", "int", |
| 261 | iothread_get_poll_param, |
| 262 | iothread_set_poll_param, |
| 263 | NULL, &poll_grow_info, &error_abort); |
| 264 | object_class_property_add(klass, "poll-shrink", "int", |
| 265 | iothread_get_poll_param, |
| 266 | iothread_set_poll_param, |
| 267 | NULL, &poll_shrink_info, &error_abort); |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 268 | } |
| 269 | |
| 270 | static const TypeInfo iothread_info = { |
| 271 | .name = TYPE_IOTHREAD, |
| 272 | .parent = TYPE_OBJECT, |
| 273 | .class_init = iothread_class_init, |
| 274 | .instance_size = sizeof(IOThread), |
Stefan Hajnoczi | cdd7abf | 2017-01-26 17:01:19 +0000 | [diff] [blame] | 275 | .instance_init = iothread_instance_init, |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 276 | .instance_finalize = iothread_instance_finalize, |
| 277 | .interfaces = (InterfaceInfo[]) { |
| 278 | {TYPE_USER_CREATABLE}, |
| 279 | {} |
| 280 | }, |
| 281 | }; |
| 282 | |
| 283 | static void iothread_register_types(void) |
| 284 | { |
| 285 | type_register_static(&iothread_info); |
| 286 | } |
| 287 | |
| 288 | type_init(iothread_register_types) |
| 289 | |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 290 | char *iothread_get_id(IOThread *iothread) |
| 291 | { |
| 292 | return object_get_canonical_path_component(OBJECT(iothread)); |
| 293 | } |
| 294 | |
| 295 | AioContext *iothread_get_aio_context(IOThread *iothread) |
| 296 | { |
| 297 | return iothread->ctx; |
| 298 | } |
Stefan Hajnoczi | dc3dd0d | 2014-02-27 11:48:42 +0100 | [diff] [blame] | 299 | |
| 300 | static int query_one_iothread(Object *object, void *opaque) |
| 301 | { |
| 302 | IOThreadInfoList ***prev = opaque; |
| 303 | IOThreadInfoList *elem; |
| 304 | IOThreadInfo *info; |
| 305 | IOThread *iothread; |
| 306 | |
| 307 | iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); |
| 308 | if (!iothread) { |
| 309 | return 0; |
| 310 | } |
| 311 | |
| 312 | info = g_new0(IOThreadInfo, 1); |
| 313 | info->id = iothread_get_id(iothread); |
| 314 | info->thread_id = iothread->thread_id; |
Pavel Hrdina | 5fc0048 | 2017-02-10 10:41:17 +0100 | [diff] [blame] | 315 | info->poll_max_ns = iothread->poll_max_ns; |
| 316 | info->poll_grow = iothread->poll_grow; |
| 317 | info->poll_shrink = iothread->poll_shrink; |
Stefan Hajnoczi | dc3dd0d | 2014-02-27 11:48:42 +0100 | [diff] [blame] | 318 | |
| 319 | elem = g_new0(IOThreadInfoList, 1); |
| 320 | elem->value = info; |
| 321 | elem->next = NULL; |
| 322 | |
| 323 | **prev = elem; |
| 324 | *prev = &elem->next; |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | IOThreadInfoList *qmp_query_iothreads(Error **errp) |
| 329 | { |
| 330 | IOThreadInfoList *head = NULL; |
| 331 | IOThreadInfoList **prev = &head; |
Daniel P. Berrange | bc2256c | 2015-05-13 17:14:05 +0100 | [diff] [blame] | 332 | Object *container = object_get_objects_root(); |
Stefan Hajnoczi | dc3dd0d | 2014-02-27 11:48:42 +0100 | [diff] [blame] | 333 | |
| 334 | object_child_foreach(container, query_one_iothread, &prev); |
| 335 | return head; |
| 336 | } |
Fam Zheng | dce8921 | 2016-09-08 17:28:51 +0800 | [diff] [blame] | 337 | |
Wang Yong | 329163c | 2017-08-29 15:22:37 +0800 | [diff] [blame] | 338 | static gpointer iothread_g_main_context_init(gpointer opaque) |
| 339 | { |
| 340 | AioContext *ctx; |
| 341 | IOThread *iothread = opaque; |
| 342 | GSource *source; |
| 343 | |
| 344 | iothread->worker_context = g_main_context_new(); |
| 345 | |
| 346 | ctx = iothread_get_aio_context(iothread); |
| 347 | source = aio_get_g_source(ctx); |
| 348 | g_source_attach(source, iothread->worker_context); |
| 349 | g_source_unref(source); |
| 350 | |
| 351 | aio_notify(iothread->ctx); |
| 352 | return NULL; |
| 353 | } |
| 354 | |
| 355 | GMainContext *iothread_get_g_main_context(IOThread *iothread) |
| 356 | { |
| 357 | g_once(&iothread->once, iothread_g_main_context_init, iothread); |
| 358 | |
| 359 | return iothread->worker_context; |
| 360 | } |
Peter Xu | 0173e21 | 2017-09-28 10:59:55 +0800 | [diff] [blame] | 361 | |
| 362 | IOThread *iothread_create(const char *id, Error **errp) |
| 363 | { |
| 364 | Object *obj; |
| 365 | |
| 366 | obj = object_new_with_props(TYPE_IOTHREAD, |
| 367 | object_get_internal_root(), |
| 368 | id, errp, NULL); |
| 369 | |
| 370 | return IOTHREAD(obj); |
| 371 | } |
| 372 | |
| 373 | void iothread_destroy(IOThread *iothread) |
| 374 | { |
| 375 | object_unparent(OBJECT(iothread)); |
| 376 | } |
Stefan Hajnoczi | fbcc692 | 2017-12-06 14:45:48 +0000 | [diff] [blame] | 377 | |
| 378 | /* Lookup IOThread by its id. Only finds user-created objects, not internal |
| 379 | * iothread_create() objects. */ |
| 380 | IOThread *iothread_by_id(const char *id) |
| 381 | { |
| 382 | return IOTHREAD(object_resolve_path_type(id, TYPE_IOTHREAD, NULL)); |
| 383 | } |