qemu-char: fix MISSING_COMMA
[qemu.git] / iothread.c
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 "block/aio.h"
18 #include "sysemu/iothread.h"
19 #include "qmp-commands.h"
20 #include "qemu/error-report.h"
21
22 #define IOTHREADS_PATH "/objects"
23
24 typedef ObjectClass IOThreadClass;
25
26 #define IOTHREAD_GET_CLASS(obj) \
27 OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD)
28 #define IOTHREAD_CLASS(klass) \
29 OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD)
30
31 static void *iothread_run(void *opaque)
32 {
33 IOThread *iothread = opaque;
34 bool blocking;
35
36 qemu_mutex_lock(&iothread->init_done_lock);
37 iothread->thread_id = qemu_get_thread_id();
38 qemu_cond_signal(&iothread->init_done_cond);
39 qemu_mutex_unlock(&iothread->init_done_lock);
40
41 while (!iothread->stopping) {
42 aio_context_acquire(iothread->ctx);
43 blocking = true;
44 while (!iothread->stopping && aio_poll(iothread->ctx, blocking)) {
45 /* Progress was made, keep going */
46 blocking = false;
47 }
48 aio_context_release(iothread->ctx);
49 }
50 return NULL;
51 }
52
53 static void iothread_instance_finalize(Object *obj)
54 {
55 IOThread *iothread = IOTHREAD(obj);
56
57 if (!iothread->ctx) {
58 return;
59 }
60 iothread->stopping = true;
61 aio_notify(iothread->ctx);
62 qemu_thread_join(&iothread->thread);
63 qemu_cond_destroy(&iothread->init_done_cond);
64 qemu_mutex_destroy(&iothread->init_done_lock);
65 aio_context_unref(iothread->ctx);
66 }
67
68 static void iothread_complete(UserCreatable *obj, Error **errp)
69 {
70 Error *local_error = NULL;
71 IOThread *iothread = IOTHREAD(obj);
72
73 iothread->stopping = false;
74 iothread->thread_id = -1;
75 iothread->ctx = aio_context_new(&local_error);
76 if (!iothread->ctx) {
77 error_propagate(errp, local_error);
78 return;
79 }
80
81 qemu_mutex_init(&iothread->init_done_lock);
82 qemu_cond_init(&iothread->init_done_cond);
83
84 /* This assumes we are called from a thread with useful CPU affinity for us
85 * to inherit.
86 */
87 qemu_thread_create(&iothread->thread, "iothread", iothread_run,
88 iothread, QEMU_THREAD_JOINABLE);
89
90 /* Wait for initialization to complete */
91 qemu_mutex_lock(&iothread->init_done_lock);
92 while (iothread->thread_id == -1) {
93 qemu_cond_wait(&iothread->init_done_cond,
94 &iothread->init_done_lock);
95 }
96 qemu_mutex_unlock(&iothread->init_done_lock);
97 }
98
99 static void iothread_class_init(ObjectClass *klass, void *class_data)
100 {
101 UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass);
102 ucc->complete = iothread_complete;
103 }
104
105 static const TypeInfo iothread_info = {
106 .name = TYPE_IOTHREAD,
107 .parent = TYPE_OBJECT,
108 .class_init = iothread_class_init,
109 .instance_size = sizeof(IOThread),
110 .instance_finalize = iothread_instance_finalize,
111 .interfaces = (InterfaceInfo[]) {
112 {TYPE_USER_CREATABLE},
113 {}
114 },
115 };
116
117 static void iothread_register_types(void)
118 {
119 type_register_static(&iothread_info);
120 }
121
122 type_init(iothread_register_types)
123
124 IOThread *iothread_find(const char *id)
125 {
126 Object *container = container_get(object_get_root(), IOTHREADS_PATH);
127 Object *child;
128
129 child = object_property_get_link(container, id, NULL);
130 if (!child) {
131 return NULL;
132 }
133 return (IOThread *)object_dynamic_cast(child, TYPE_IOTHREAD);
134 }
135
136 char *iothread_get_id(IOThread *iothread)
137 {
138 return object_get_canonical_path_component(OBJECT(iothread));
139 }
140
141 AioContext *iothread_get_aio_context(IOThread *iothread)
142 {
143 return iothread->ctx;
144 }
145
146 static int query_one_iothread(Object *object, void *opaque)
147 {
148 IOThreadInfoList ***prev = opaque;
149 IOThreadInfoList *elem;
150 IOThreadInfo *info;
151 IOThread *iothread;
152
153 iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD);
154 if (!iothread) {
155 return 0;
156 }
157
158 info = g_new0(IOThreadInfo, 1);
159 info->id = iothread_get_id(iothread);
160 info->thread_id = iothread->thread_id;
161
162 elem = g_new0(IOThreadInfoList, 1);
163 elem->value = info;
164 elem->next = NULL;
165
166 **prev = elem;
167 *prev = &elem->next;
168 return 0;
169 }
170
171 IOThreadInfoList *qmp_query_iothreads(Error **errp)
172 {
173 IOThreadInfoList *head = NULL;
174 IOThreadInfoList **prev = &head;
175 Object *container = container_get(object_get_root(), IOTHREADS_PATH);
176
177 object_child_foreach(container, query_one_iothread, &prev);
178 return head;
179 }