4 * Copyright Red Hat Inc., 2013
7 * Stefan Hajnoczi <stefanha@redhat.com>
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.
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"
21 #define IOTHREADS_PATH "/objects"
23 typedef ObjectClass IOThreadClass
;
25 #define IOTHREAD_GET_CLASS(obj) \
26 OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD)
27 #define IOTHREAD_CLASS(klass) \
28 OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD)
30 static void *iothread_run(void *opaque
)
32 IOThread
*iothread
= opaque
;
35 qemu_mutex_lock(&iothread
->init_done_lock
);
36 iothread
->thread_id
= qemu_get_thread_id();
37 qemu_cond_signal(&iothread
->init_done_cond
);
38 qemu_mutex_unlock(&iothread
->init_done_lock
);
40 while (!iothread
->stopping
) {
41 aio_context_acquire(iothread
->ctx
);
43 while (!iothread
->stopping
&& aio_poll(iothread
->ctx
, blocking
)) {
44 /* Progress was made, keep going */
47 aio_context_release(iothread
->ctx
);
52 static void iothread_instance_finalize(Object
*obj
)
54 IOThread
*iothread
= IOTHREAD(obj
);
56 iothread
->stopping
= true;
57 aio_notify(iothread
->ctx
);
58 qemu_thread_join(&iothread
->thread
);
59 qemu_cond_destroy(&iothread
->init_done_cond
);
60 qemu_mutex_destroy(&iothread
->init_done_lock
);
61 aio_context_unref(iothread
->ctx
);
64 static void iothread_complete(UserCreatable
*obj
, Error
**errp
)
66 IOThread
*iothread
= IOTHREAD(obj
);
68 iothread
->stopping
= false;
69 iothread
->ctx
= aio_context_new();
70 iothread
->thread_id
= -1;
72 qemu_mutex_init(&iothread
->init_done_lock
);
73 qemu_cond_init(&iothread
->init_done_cond
);
75 /* This assumes we are called from a thread with useful CPU affinity for us
78 qemu_thread_create(&iothread
->thread
, "iothread", iothread_run
,
79 iothread
, QEMU_THREAD_JOINABLE
);
81 /* Wait for initialization to complete */
82 qemu_mutex_lock(&iothread
->init_done_lock
);
83 while (iothread
->thread_id
== -1) {
84 qemu_cond_wait(&iothread
->init_done_cond
,
85 &iothread
->init_done_lock
);
87 qemu_mutex_unlock(&iothread
->init_done_lock
);
90 static void iothread_class_init(ObjectClass
*klass
, void *class_data
)
92 UserCreatableClass
*ucc
= USER_CREATABLE_CLASS(klass
);
93 ucc
->complete
= iothread_complete
;
96 static const TypeInfo iothread_info
= {
97 .name
= TYPE_IOTHREAD
,
98 .parent
= TYPE_OBJECT
,
99 .class_init
= iothread_class_init
,
100 .instance_size
= sizeof(IOThread
),
101 .instance_finalize
= iothread_instance_finalize
,
102 .interfaces
= (InterfaceInfo
[]) {
103 {TYPE_USER_CREATABLE
},
108 static void iothread_register_types(void)
110 type_register_static(&iothread_info
);
113 type_init(iothread_register_types
)
115 IOThread
*iothread_find(const char *id
)
117 Object
*container
= container_get(object_get_root(), IOTHREADS_PATH
);
120 child
= object_property_get_link(container
, id
, NULL
);
124 return (IOThread
*)object_dynamic_cast(child
, TYPE_IOTHREAD
);
127 char *iothread_get_id(IOThread
*iothread
)
129 return object_get_canonical_path_component(OBJECT(iothread
));
132 AioContext
*iothread_get_aio_context(IOThread
*iothread
)
134 return iothread
->ctx
;
137 static int query_one_iothread(Object
*object
, void *opaque
)
139 IOThreadInfoList
***prev
= opaque
;
140 IOThreadInfoList
*elem
;
144 iothread
= (IOThread
*)object_dynamic_cast(object
, TYPE_IOTHREAD
);
149 info
= g_new0(IOThreadInfo
, 1);
150 info
->id
= iothread_get_id(iothread
);
151 info
->thread_id
= iothread
->thread_id
;
153 elem
= g_new0(IOThreadInfoList
, 1);
162 IOThreadInfoList
*qmp_query_iothreads(Error
**errp
)
164 IOThreadInfoList
*head
= NULL
;
165 IOThreadInfoList
**prev
= &head
;
166 Object
*container
= container_get(object_get_root(), IOTHREADS_PATH
);
168 object_child_foreach(container
, query_one_iothread
, &prev
);