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be8d8537 SH |
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 | ||
14 | #include "qom/object.h" | |
15 | #include "qom/object_interfaces.h" | |
16 | #include "qemu/module.h" | |
17 | #include "qemu/thread.h" | |
18 | #include "block/aio.h" | |
19 | #include "sysemu/iothread.h" | |
20 | ||
21 | #define IOTHREADS_PATH "/objects" | |
22 | ||
23 | typedef ObjectClass IOThreadClass; | |
24 | struct IOThread { | |
25 | Object parent_obj; | |
26 | ||
27 | QemuThread thread; | |
28 | AioContext *ctx; | |
29 | bool stopping; | |
30 | }; | |
31 | ||
32 | #define IOTHREAD_GET_CLASS(obj) \ | |
33 | OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD) | |
34 | #define IOTHREAD_CLASS(klass) \ | |
35 | OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD) | |
36 | ||
37 | static void *iothread_run(void *opaque) | |
38 | { | |
39 | IOThread *iothread = opaque; | |
40 | ||
41 | while (!iothread->stopping) { | |
42 | aio_context_acquire(iothread->ctx); | |
43 | while (!iothread->stopping && aio_poll(iothread->ctx, true)) { | |
44 | /* Progress was made, keep going */ | |
45 | } | |
46 | aio_context_release(iothread->ctx); | |
47 | } | |
48 | return NULL; | |
49 | } | |
50 | ||
51 | static void iothread_instance_finalize(Object *obj) | |
52 | { | |
53 | IOThread *iothread = IOTHREAD(obj); | |
54 | ||
55 | iothread->stopping = true; | |
56 | aio_notify(iothread->ctx); | |
57 | qemu_thread_join(&iothread->thread); | |
58 | aio_context_unref(iothread->ctx); | |
59 | } | |
60 | ||
61 | static void iothread_complete(UserCreatable *obj, Error **errp) | |
62 | { | |
63 | IOThread *iothread = IOTHREAD(obj); | |
64 | ||
65 | iothread->stopping = false; | |
66 | iothread->ctx = aio_context_new(); | |
67 | ||
68 | /* This assumes we are called from a thread with useful CPU affinity for us | |
69 | * to inherit. | |
70 | */ | |
71 | qemu_thread_create(&iothread->thread, "iothread", iothread_run, | |
72 | iothread, QEMU_THREAD_JOINABLE); | |
73 | } | |
74 | ||
75 | static void iothread_class_init(ObjectClass *klass, void *class_data) | |
76 | { | |
77 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass); | |
78 | ucc->complete = iothread_complete; | |
79 | } | |
80 | ||
81 | static const TypeInfo iothread_info = { | |
82 | .name = TYPE_IOTHREAD, | |
83 | .parent = TYPE_OBJECT, | |
84 | .class_init = iothread_class_init, | |
85 | .instance_size = sizeof(IOThread), | |
86 | .instance_finalize = iothread_instance_finalize, | |
87 | .interfaces = (InterfaceInfo[]) { | |
88 | {TYPE_USER_CREATABLE}, | |
89 | {} | |
90 | }, | |
91 | }; | |
92 | ||
93 | static void iothread_register_types(void) | |
94 | { | |
95 | type_register_static(&iothread_info); | |
96 | } | |
97 | ||
98 | type_init(iothread_register_types) | |
99 | ||
100 | IOThread *iothread_find(const char *id) | |
101 | { | |
102 | Object *container = container_get(object_get_root(), IOTHREADS_PATH); | |
103 | Object *child; | |
104 | ||
105 | child = object_property_get_link(container, id, NULL); | |
106 | if (!child) { | |
107 | return NULL; | |
108 | } | |
109 | return (IOThread *)object_dynamic_cast(child, TYPE_IOTHREAD); | |
110 | } | |
111 | ||
112 | char *iothread_get_id(IOThread *iothread) | |
113 | { | |
114 | return object_get_canonical_path_component(OBJECT(iothread)); | |
115 | } | |
116 | ||
117 | AioContext *iothread_get_aio_context(IOThread *iothread) | |
118 | { | |
119 | return iothread->ctx; | |
120 | } |