docker: Print used options before doing configure
[qemu/ar7.git] / iothread.c
blobfb08a60b4b956b458eea4793a28511967aa7ad70
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 int iothread_stop(Object *object, void *opaque)
59 IOThread *iothread;
61 iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD);
62 if (!iothread || !iothread->ctx) {
63 return 0;
65 iothread->stopping = true;
66 aio_notify(iothread->ctx);
67 qemu_thread_join(&iothread->thread);
68 return 0;
71 static void iothread_instance_finalize(Object *obj)
73 IOThread *iothread = IOTHREAD(obj);
75 iothread_stop(obj, NULL);
76 qemu_cond_destroy(&iothread->init_done_cond);
77 qemu_mutex_destroy(&iothread->init_done_lock);
78 aio_context_unref(iothread->ctx);
81 static void iothread_complete(UserCreatable *obj, Error **errp)
83 Error *local_error = NULL;
84 IOThread *iothread = IOTHREAD(obj);
85 char *name, *thread_name;
87 iothread->stopping = false;
88 iothread->thread_id = -1;
89 iothread->ctx = aio_context_new(&local_error);
90 if (!iothread->ctx) {
91 error_propagate(errp, local_error);
92 return;
95 qemu_mutex_init(&iothread->init_done_lock);
96 qemu_cond_init(&iothread->init_done_cond);
98 /* This assumes we are called from a thread with useful CPU affinity for us
99 * to inherit.
101 name = object_get_canonical_path_component(OBJECT(obj));
102 thread_name = g_strdup_printf("IO %s", name);
103 qemu_thread_create(&iothread->thread, thread_name, iothread_run,
104 iothread, QEMU_THREAD_JOINABLE);
105 g_free(thread_name);
106 g_free(name);
108 /* Wait for initialization to complete */
109 qemu_mutex_lock(&iothread->init_done_lock);
110 while (iothread->thread_id == -1) {
111 qemu_cond_wait(&iothread->init_done_cond,
112 &iothread->init_done_lock);
114 qemu_mutex_unlock(&iothread->init_done_lock);
117 static void iothread_class_init(ObjectClass *klass, void *class_data)
119 UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass);
120 ucc->complete = iothread_complete;
123 static const TypeInfo iothread_info = {
124 .name = TYPE_IOTHREAD,
125 .parent = TYPE_OBJECT,
126 .class_init = iothread_class_init,
127 .instance_size = sizeof(IOThread),
128 .instance_finalize = iothread_instance_finalize,
129 .interfaces = (InterfaceInfo[]) {
130 {TYPE_USER_CREATABLE},
135 static void iothread_register_types(void)
137 type_register_static(&iothread_info);
140 type_init(iothread_register_types)
142 char *iothread_get_id(IOThread *iothread)
144 return object_get_canonical_path_component(OBJECT(iothread));
147 AioContext *iothread_get_aio_context(IOThread *iothread)
149 return iothread->ctx;
152 static int query_one_iothread(Object *object, void *opaque)
154 IOThreadInfoList ***prev = opaque;
155 IOThreadInfoList *elem;
156 IOThreadInfo *info;
157 IOThread *iothread;
159 iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD);
160 if (!iothread) {
161 return 0;
164 info = g_new0(IOThreadInfo, 1);
165 info->id = iothread_get_id(iothread);
166 info->thread_id = iothread->thread_id;
168 elem = g_new0(IOThreadInfoList, 1);
169 elem->value = info;
170 elem->next = NULL;
172 **prev = elem;
173 *prev = &elem->next;
174 return 0;
177 IOThreadInfoList *qmp_query_iothreads(Error **errp)
179 IOThreadInfoList *head = NULL;
180 IOThreadInfoList **prev = &head;
181 Object *container = object_get_objects_root();
183 object_child_foreach(container, query_one_iothread, &prev);
184 return head;
187 void iothread_stop_all(void)
189 Object *container = object_get_objects_root();
191 object_child_foreach(container, iothread_stop, NULL);