mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 18:05:37 +00:00
![Paolo Bonzini](/assets/img/avatar_default.png)
Otherwise, grace periods are detected too early! Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
171 lines
4.3 KiB
C
171 lines
4.3 KiB
C
/*
|
|
* Event loop thread
|
|
*
|
|
* Copyright Red Hat Inc., 2013
|
|
*
|
|
* Authors:
|
|
* Stefan Hajnoczi <stefanha@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "qom/object.h"
|
|
#include "qom/object_interfaces.h"
|
|
#include "qemu/module.h"
|
|
#include "block/aio.h"
|
|
#include "sysemu/iothread.h"
|
|
#include "qmp-commands.h"
|
|
#include "qemu/error-report.h"
|
|
#include "qemu/rcu.h"
|
|
|
|
typedef ObjectClass IOThreadClass;
|
|
|
|
#define IOTHREAD_GET_CLASS(obj) \
|
|
OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD)
|
|
#define IOTHREAD_CLASS(klass) \
|
|
OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD)
|
|
|
|
static void *iothread_run(void *opaque)
|
|
{
|
|
IOThread *iothread = opaque;
|
|
bool blocking;
|
|
|
|
rcu_register_thread();
|
|
|
|
qemu_mutex_lock(&iothread->init_done_lock);
|
|
iothread->thread_id = qemu_get_thread_id();
|
|
qemu_cond_signal(&iothread->init_done_cond);
|
|
qemu_mutex_unlock(&iothread->init_done_lock);
|
|
|
|
while (!iothread->stopping) {
|
|
aio_context_acquire(iothread->ctx);
|
|
blocking = true;
|
|
while (!iothread->stopping && aio_poll(iothread->ctx, blocking)) {
|
|
/* Progress was made, keep going */
|
|
blocking = false;
|
|
}
|
|
aio_context_release(iothread->ctx);
|
|
}
|
|
|
|
rcu_unregister_thread();
|
|
return NULL;
|
|
}
|
|
|
|
static void iothread_instance_finalize(Object *obj)
|
|
{
|
|
IOThread *iothread = IOTHREAD(obj);
|
|
|
|
if (!iothread->ctx) {
|
|
return;
|
|
}
|
|
iothread->stopping = true;
|
|
aio_notify(iothread->ctx);
|
|
qemu_thread_join(&iothread->thread);
|
|
qemu_cond_destroy(&iothread->init_done_cond);
|
|
qemu_mutex_destroy(&iothread->init_done_lock);
|
|
aio_context_unref(iothread->ctx);
|
|
}
|
|
|
|
static void iothread_complete(UserCreatable *obj, Error **errp)
|
|
{
|
|
Error *local_error = NULL;
|
|
IOThread *iothread = IOTHREAD(obj);
|
|
|
|
iothread->stopping = false;
|
|
iothread->thread_id = -1;
|
|
iothread->ctx = aio_context_new(&local_error);
|
|
if (!iothread->ctx) {
|
|
error_propagate(errp, local_error);
|
|
return;
|
|
}
|
|
|
|
qemu_mutex_init(&iothread->init_done_lock);
|
|
qemu_cond_init(&iothread->init_done_cond);
|
|
|
|
/* This assumes we are called from a thread with useful CPU affinity for us
|
|
* to inherit.
|
|
*/
|
|
qemu_thread_create(&iothread->thread, "iothread", iothread_run,
|
|
iothread, QEMU_THREAD_JOINABLE);
|
|
|
|
/* Wait for initialization to complete */
|
|
qemu_mutex_lock(&iothread->init_done_lock);
|
|
while (iothread->thread_id == -1) {
|
|
qemu_cond_wait(&iothread->init_done_cond,
|
|
&iothread->init_done_lock);
|
|
}
|
|
qemu_mutex_unlock(&iothread->init_done_lock);
|
|
}
|
|
|
|
static void iothread_class_init(ObjectClass *klass, void *class_data)
|
|
{
|
|
UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass);
|
|
ucc->complete = iothread_complete;
|
|
}
|
|
|
|
static const TypeInfo iothread_info = {
|
|
.name = TYPE_IOTHREAD,
|
|
.parent = TYPE_OBJECT,
|
|
.class_init = iothread_class_init,
|
|
.instance_size = sizeof(IOThread),
|
|
.instance_finalize = iothread_instance_finalize,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
{TYPE_USER_CREATABLE},
|
|
{}
|
|
},
|
|
};
|
|
|
|
static void iothread_register_types(void)
|
|
{
|
|
type_register_static(&iothread_info);
|
|
}
|
|
|
|
type_init(iothread_register_types)
|
|
|
|
char *iothread_get_id(IOThread *iothread)
|
|
{
|
|
return object_get_canonical_path_component(OBJECT(iothread));
|
|
}
|
|
|
|
AioContext *iothread_get_aio_context(IOThread *iothread)
|
|
{
|
|
return iothread->ctx;
|
|
}
|
|
|
|
static int query_one_iothread(Object *object, void *opaque)
|
|
{
|
|
IOThreadInfoList ***prev = opaque;
|
|
IOThreadInfoList *elem;
|
|
IOThreadInfo *info;
|
|
IOThread *iothread;
|
|
|
|
iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD);
|
|
if (!iothread) {
|
|
return 0;
|
|
}
|
|
|
|
info = g_new0(IOThreadInfo, 1);
|
|
info->id = iothread_get_id(iothread);
|
|
info->thread_id = iothread->thread_id;
|
|
|
|
elem = g_new0(IOThreadInfoList, 1);
|
|
elem->value = info;
|
|
elem->next = NULL;
|
|
|
|
**prev = elem;
|
|
*prev = &elem->next;
|
|
return 0;
|
|
}
|
|
|
|
IOThreadInfoList *qmp_query_iothreads(Error **errp)
|
|
{
|
|
IOThreadInfoList *head = NULL;
|
|
IOThreadInfoList **prev = &head;
|
|
Object *container = object_get_objects_root();
|
|
|
|
object_child_foreach(container, query_one_iothread, &prev);
|
|
return head;
|
|
}
|