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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; | |
88eb7c29 SH |
29 | QemuMutex init_done_lock; |
30 | QemuCond init_done_cond; /* is thread initialization done? */ | |
be8d8537 | 31 | bool stopping; |
88eb7c29 | 32 | int thread_id; |
be8d8537 SH |
33 | }; |
34 | ||
35 | #define IOTHREAD_GET_CLASS(obj) \ | |
36 | OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD) | |
37 | #define IOTHREAD_CLASS(klass) \ | |
38 | OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD) | |
39 | ||
40 | static void *iothread_run(void *opaque) | |
41 | { | |
42 | IOThread *iothread = opaque; | |
43 | ||
88eb7c29 SH |
44 | qemu_mutex_lock(&iothread->init_done_lock); |
45 | iothread->thread_id = qemu_get_thread_id(); | |
46 | qemu_cond_signal(&iothread->init_done_cond); | |
47 | qemu_mutex_unlock(&iothread->init_done_lock); | |
48 | ||
be8d8537 SH |
49 | while (!iothread->stopping) { |
50 | aio_context_acquire(iothread->ctx); | |
51 | while (!iothread->stopping && aio_poll(iothread->ctx, true)) { | |
52 | /* Progress was made, keep going */ | |
53 | } | |
54 | aio_context_release(iothread->ctx); | |
55 | } | |
56 | return NULL; | |
57 | } | |
58 | ||
59 | static void iothread_instance_finalize(Object *obj) | |
60 | { | |
61 | IOThread *iothread = IOTHREAD(obj); | |
62 | ||
63 | iothread->stopping = true; | |
64 | aio_notify(iothread->ctx); | |
65 | qemu_thread_join(&iothread->thread); | |
88eb7c29 SH |
66 | qemu_cond_destroy(&iothread->init_done_cond); |
67 | qemu_mutex_destroy(&iothread->init_done_lock); | |
be8d8537 SH |
68 | aio_context_unref(iothread->ctx); |
69 | } | |
70 | ||
71 | static void iothread_complete(UserCreatable *obj, Error **errp) | |
72 | { | |
73 | IOThread *iothread = IOTHREAD(obj); | |
74 | ||
75 | iothread->stopping = false; | |
76 | iothread->ctx = aio_context_new(); | |
88eb7c29 SH |
77 | iothread->thread_id = -1; |
78 | ||
79 | qemu_mutex_init(&iothread->init_done_lock); | |
80 | qemu_cond_init(&iothread->init_done_cond); | |
be8d8537 SH |
81 | |
82 | /* This assumes we are called from a thread with useful CPU affinity for us | |
83 | * to inherit. | |
84 | */ | |
85 | qemu_thread_create(&iothread->thread, "iothread", iothread_run, | |
86 | iothread, QEMU_THREAD_JOINABLE); | |
88eb7c29 SH |
87 | |
88 | /* Wait for initialization to complete */ | |
89 | qemu_mutex_lock(&iothread->init_done_lock); | |
90 | while (iothread->thread_id == -1) { | |
91 | qemu_cond_wait(&iothread->init_done_cond, | |
92 | &iothread->init_done_lock); | |
93 | } | |
94 | qemu_mutex_unlock(&iothread->init_done_lock); | |
be8d8537 SH |
95 | } |
96 | ||
97 | static void iothread_class_init(ObjectClass *klass, void *class_data) | |
98 | { | |
99 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass); | |
100 | ucc->complete = iothread_complete; | |
101 | } | |
102 | ||
103 | static const TypeInfo iothread_info = { | |
104 | .name = TYPE_IOTHREAD, | |
105 | .parent = TYPE_OBJECT, | |
106 | .class_init = iothread_class_init, | |
107 | .instance_size = sizeof(IOThread), | |
108 | .instance_finalize = iothread_instance_finalize, | |
109 | .interfaces = (InterfaceInfo[]) { | |
110 | {TYPE_USER_CREATABLE}, | |
111 | {} | |
112 | }, | |
113 | }; | |
114 | ||
115 | static void iothread_register_types(void) | |
116 | { | |
117 | type_register_static(&iothread_info); | |
118 | } | |
119 | ||
120 | type_init(iothread_register_types) | |
121 | ||
122 | IOThread *iothread_find(const char *id) | |
123 | { | |
124 | Object *container = container_get(object_get_root(), IOTHREADS_PATH); | |
125 | Object *child; | |
126 | ||
127 | child = object_property_get_link(container, id, NULL); | |
128 | if (!child) { | |
129 | return NULL; | |
130 | } | |
131 | return (IOThread *)object_dynamic_cast(child, TYPE_IOTHREAD); | |
132 | } | |
133 | ||
134 | char *iothread_get_id(IOThread *iothread) | |
135 | { | |
136 | return object_get_canonical_path_component(OBJECT(iothread)); | |
137 | } | |
138 | ||
139 | AioContext *iothread_get_aio_context(IOThread *iothread) | |
140 | { | |
141 | return iothread->ctx; | |
142 | } |