s390-ccw.img: rebuild image
[qemu/ar7.git] / iothread.c
blobf183d380e6a440e3c8846a1ac38fab5bc3c94866
1 /*
2 * Event loop thread
4 * Copyright Red Hat Inc., 2013
6 * Authors:
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 "qemu/osdep.h"
15 #include "qom/object.h"
16 #include "qom/object_interfaces.h"
17 #include "qemu/module.h"
18 #include "block/aio.h"
19 #include "sysemu/iothread.h"
20 #include "qmp-commands.h"
21 #include "qemu/error-report.h"
22 #include "qemu/rcu.h"
24 typedef ObjectClass IOThreadClass;
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)
31 static void *iothread_run(void *opaque)
33 IOThread *iothread = opaque;
34 bool blocking;
36 rcu_register_thread();
38 qemu_mutex_lock(&iothread->init_done_lock);
39 iothread->thread_id = qemu_get_thread_id();
40 qemu_cond_signal(&iothread->init_done_cond);
41 qemu_mutex_unlock(&iothread->init_done_lock);
43 while (!iothread->stopping) {
44 aio_context_acquire(iothread->ctx);
45 blocking = true;
46 while (!iothread->stopping && aio_poll(iothread->ctx, blocking)) {
47 /* Progress was made, keep going */
48 blocking = false;
50 aio_context_release(iothread->ctx);
53 rcu_unregister_thread();
54 return NULL;
57 static void iothread_instance_finalize(Object *obj)
59 IOThread *iothread = IOTHREAD(obj);
61 if (!iothread->ctx) {
62 return;
64 iothread->stopping = true;
65 aio_notify(iothread->ctx);
66 qemu_thread_join(&iothread->thread);
67 qemu_cond_destroy(&iothread->init_done_cond);
68 qemu_mutex_destroy(&iothread->init_done_lock);
69 aio_context_unref(iothread->ctx);
72 static void iothread_complete(UserCreatable *obj, Error **errp)
74 Error *local_error = NULL;
75 IOThread *iothread = IOTHREAD(obj);
76 char *name, *thread_name;
78 iothread->stopping = false;
79 iothread->thread_id = -1;
80 iothread->ctx = aio_context_new(&local_error);
81 if (!iothread->ctx) {
82 error_propagate(errp, local_error);
83 return;
86 qemu_mutex_init(&iothread->init_done_lock);
87 qemu_cond_init(&iothread->init_done_cond);
89 /* This assumes we are called from a thread with useful CPU affinity for us
90 * to inherit.
92 name = object_get_canonical_path_component(OBJECT(obj));
93 thread_name = g_strdup_printf("IO %s", name);
94 qemu_thread_create(&iothread->thread, thread_name, iothread_run,
95 iothread, QEMU_THREAD_JOINABLE);
96 g_free(thread_name);
97 g_free(name);
99 /* Wait for initialization to complete */
100 qemu_mutex_lock(&iothread->init_done_lock);
101 while (iothread->thread_id == -1) {
102 qemu_cond_wait(&iothread->init_done_cond,
103 &iothread->init_done_lock);
105 qemu_mutex_unlock(&iothread->init_done_lock);
108 static void iothread_class_init(ObjectClass *klass, void *class_data)
110 UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass);
111 ucc->complete = iothread_complete;
114 static const TypeInfo iothread_info = {
115 .name = TYPE_IOTHREAD,
116 .parent = TYPE_OBJECT,
117 .class_init = iothread_class_init,
118 .instance_size = sizeof(IOThread),
119 .instance_finalize = iothread_instance_finalize,
120 .interfaces = (InterfaceInfo[]) {
121 {TYPE_USER_CREATABLE},
126 static void iothread_register_types(void)
128 type_register_static(&iothread_info);
131 type_init(iothread_register_types)
133 char *iothread_get_id(IOThread *iothread)
135 return object_get_canonical_path_component(OBJECT(iothread));
138 AioContext *iothread_get_aio_context(IOThread *iothread)
140 return iothread->ctx;
143 static int query_one_iothread(Object *object, void *opaque)
145 IOThreadInfoList ***prev = opaque;
146 IOThreadInfoList *elem;
147 IOThreadInfo *info;
148 IOThread *iothread;
150 iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD);
151 if (!iothread) {
152 return 0;
155 info = g_new0(IOThreadInfo, 1);
156 info->id = iothread_get_id(iothread);
157 info->thread_id = iothread->thread_id;
159 elem = g_new0(IOThreadInfoList, 1);
160 elem->value = info;
161 elem->next = NULL;
163 **prev = elem;
164 *prev = &elem->next;
165 return 0;
168 IOThreadInfoList *qmp_query_iothreads(Error **errp)
170 IOThreadInfoList *head = NULL;
171 IOThreadInfoList **prev = &head;
172 Object *container = object_get_objects_root();
174 object_child_foreach(container, query_one_iothread, &prev);
175 return head;