2014-03-03 14:30:05 +04:00
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/*
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* Event loop thread
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*
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* Copyright Red Hat Inc., 2013
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qom/object.h"
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#include "qom/object_interfaces.h"
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#include "qemu/module.h"
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#include "block/aio.h"
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#include "sysemu/iothread.h"
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2014-02-27 14:48:42 +04:00
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#include "qmp-commands.h"
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2014-09-18 15:30:49 +04:00
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#include "qemu/error-report.h"
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2014-03-03 14:30:05 +04:00
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#define IOTHREADS_PATH "/objects"
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typedef ObjectClass IOThreadClass;
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#define IOTHREAD_GET_CLASS(obj) \
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OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD)
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#define IOTHREAD_CLASS(klass) \
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OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD)
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static void *iothread_run(void *opaque)
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{
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IOThread *iothread = opaque;
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2015-06-03 12:15:33 +03:00
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bool blocking;
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2014-03-03 14:30:05 +04:00
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2014-02-27 14:48:41 +04:00
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qemu_mutex_lock(&iothread->init_done_lock);
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iothread->thread_id = qemu_get_thread_id();
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qemu_cond_signal(&iothread->init_done_cond);
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qemu_mutex_unlock(&iothread->init_done_lock);
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2015-06-03 12:15:33 +03:00
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while (!iothread->stopping) {
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aio_context_acquire(iothread->ctx);
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blocking = true;
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while (!iothread->stopping && aio_poll(iothread->ctx, blocking)) {
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/* Progress was made, keep going */
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blocking = false;
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}
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aio_context_release(iothread->ctx);
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2014-03-03 14:30:05 +04:00
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}
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return NULL;
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}
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static void iothread_instance_finalize(Object *obj)
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{
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IOThread *iothread = IOTHREAD(obj);
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2014-09-18 15:30:49 +04:00
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if (!iothread->ctx) {
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return;
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}
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2014-03-03 14:30:05 +04:00
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iothread->stopping = true;
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aio_notify(iothread->ctx);
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qemu_thread_join(&iothread->thread);
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2014-02-27 14:48:41 +04:00
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qemu_cond_destroy(&iothread->init_done_cond);
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qemu_mutex_destroy(&iothread->init_done_lock);
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2014-03-03 14:30:05 +04:00
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aio_context_unref(iothread->ctx);
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}
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static void iothread_complete(UserCreatable *obj, Error **errp)
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{
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2014-09-18 15:30:49 +04:00
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Error *local_error = NULL;
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2014-03-03 14:30:05 +04:00
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IOThread *iothread = IOTHREAD(obj);
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iothread->stopping = false;
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2014-02-27 14:48:41 +04:00
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iothread->thread_id = -1;
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2014-09-18 15:30:49 +04:00
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iothread->ctx = aio_context_new(&local_error);
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if (!iothread->ctx) {
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error_propagate(errp, local_error);
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return;
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}
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2014-02-27 14:48:41 +04:00
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qemu_mutex_init(&iothread->init_done_lock);
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qemu_cond_init(&iothread->init_done_cond);
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2014-03-03 14:30:05 +04:00
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/* This assumes we are called from a thread with useful CPU affinity for us
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* to inherit.
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*/
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qemu_thread_create(&iothread->thread, "iothread", iothread_run,
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iothread, QEMU_THREAD_JOINABLE);
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2014-02-27 14:48:41 +04:00
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/* Wait for initialization to complete */
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qemu_mutex_lock(&iothread->init_done_lock);
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while (iothread->thread_id == -1) {
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qemu_cond_wait(&iothread->init_done_cond,
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&iothread->init_done_lock);
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}
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qemu_mutex_unlock(&iothread->init_done_lock);
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2014-03-03 14:30:05 +04:00
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}
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static void iothread_class_init(ObjectClass *klass, void *class_data)
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{
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UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass);
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ucc->complete = iothread_complete;
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}
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static const TypeInfo iothread_info = {
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.name = TYPE_IOTHREAD,
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.parent = TYPE_OBJECT,
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.class_init = iothread_class_init,
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.instance_size = sizeof(IOThread),
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.instance_finalize = iothread_instance_finalize,
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.interfaces = (InterfaceInfo[]) {
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{TYPE_USER_CREATABLE},
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{}
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},
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};
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static void iothread_register_types(void)
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{
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type_register_static(&iothread_info);
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}
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type_init(iothread_register_types)
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char *iothread_get_id(IOThread *iothread)
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{
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return object_get_canonical_path_component(OBJECT(iothread));
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}
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AioContext *iothread_get_aio_context(IOThread *iothread)
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{
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return iothread->ctx;
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}
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2014-02-27 14:48:42 +04:00
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static int query_one_iothread(Object *object, void *opaque)
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{
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IOThreadInfoList ***prev = opaque;
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IOThreadInfoList *elem;
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IOThreadInfo *info;
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IOThread *iothread;
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iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD);
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if (!iothread) {
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return 0;
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}
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info = g_new0(IOThreadInfo, 1);
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info->id = iothread_get_id(iothread);
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info->thread_id = iothread->thread_id;
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elem = g_new0(IOThreadInfoList, 1);
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elem->value = info;
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elem->next = NULL;
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**prev = elem;
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*prev = &elem->next;
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return 0;
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}
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IOThreadInfoList *qmp_query_iothreads(Error **errp)
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{
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IOThreadInfoList *head = NULL;
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IOThreadInfoList **prev = &head;
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Object *container = container_get(object_get_root(), IOTHREADS_PATH);
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object_child_foreach(container, query_one_iothread, &prev);
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return head;
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}
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