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 "qemu/thread.h"
18 #include "block/aio.h"
19 #include "sysemu/iothread.h"
21 #define IOTHREADS_PATH "/objects"
23 typedef ObjectClass IOThreadClass
;
29 QemuMutex init_done_lock
;
30 QemuCond init_done_cond
; /* is thread initialization done? */
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)
40 static void *iothread_run(void *opaque
)
42 IOThread
*iothread
= opaque
;
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
);
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 */
54 aio_context_release(iothread
->ctx
);
59 static void iothread_instance_finalize(Object
*obj
)
61 IOThread
*iothread
= IOTHREAD(obj
);
63 iothread
->stopping
= true;
64 aio_notify(iothread
->ctx
);
65 qemu_thread_join(&iothread
->thread
);
66 qemu_cond_destroy(&iothread
->init_done_cond
);
67 qemu_mutex_destroy(&iothread
->init_done_lock
);
68 aio_context_unref(iothread
->ctx
);
71 static void iothread_complete(UserCreatable
*obj
, Error
**errp
)
73 IOThread
*iothread
= IOTHREAD(obj
);
75 iothread
->stopping
= false;
76 iothread
->ctx
= aio_context_new();
77 iothread
->thread_id
= -1;
79 qemu_mutex_init(&iothread
->init_done_lock
);
80 qemu_cond_init(&iothread
->init_done_cond
);
82 /* This assumes we are called from a thread with useful CPU affinity for us
85 qemu_thread_create(&iothread
->thread
, "iothread", iothread_run
,
86 iothread
, QEMU_THREAD_JOINABLE
);
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
);
94 qemu_mutex_unlock(&iothread
->init_done_lock
);
97 static void iothread_class_init(ObjectClass
*klass
, void *class_data
)
99 UserCreatableClass
*ucc
= USER_CREATABLE_CLASS(klass
);
100 ucc
->complete
= iothread_complete
;
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
},
115 static void iothread_register_types(void)
117 type_register_static(&iothread_info
);
120 type_init(iothread_register_types
)
122 IOThread
*iothread_find(const char *id
)
124 Object
*container
= container_get(object_get_root(), IOTHREADS_PATH
);
127 child
= object_property_get_link(container
, id
, NULL
);
131 return (IOThread
*)object_dynamic_cast(child
, TYPE_IOTHREAD
);
134 char *iothread_get_id(IOThread
*iothread
)
136 return object_get_canonical_path_component(OBJECT(iothread
));
139 AioContext
*iothread_get_aio_context(IOThread
*iothread
)
141 return iothread
->ctx
;