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/*
* QEMU I/O task
*
* Copyright (c) 2015 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "io/task.h"
#include "qapi/error.h"
#include "qemu/thread.h"
#include "trace.h"
struct QIOTask {
Object *source;
QIOTaskFunc func;
gpointer opaque;
GDestroyNotify destroy;
};
QIOTask *qio_task_new(Object *source,
QIOTaskFunc func,
gpointer opaque,
GDestroyNotify destroy)
{
QIOTask *task;
task = g_new0(QIOTask, 1);
task->source = source;
object_ref(source);
task->func = func;
task->opaque = opaque;
task->destroy = destroy;
trace_qio_task_new(task, source, func, opaque);
return task;
}
static void qio_task_free(QIOTask *task)
{
if (task->destroy) {
task->destroy(task->opaque);
}
object_unref(task->source);
g_free(task);
}
struct QIOTaskThreadData {
QIOTask *task;
QIOTaskWorker worker;
gpointer opaque;
GDestroyNotify destroy;
Error *err;
int ret;
};
static gboolean gio_task_thread_result(gpointer opaque)
{
struct QIOTaskThreadData *data = opaque;
trace_qio_task_thread_result(data->task);
if (data->ret == 0) {
qio_task_complete(data->task);
} else {
qio_task_abort(data->task, data->err);
}
error_free(data->err);
if (data->destroy) {
data->destroy(data->opaque);
}
g_free(data);
return FALSE;
}
static gpointer qio_task_thread_worker(gpointer opaque)
{
struct QIOTaskThreadData *data = opaque;
trace_qio_task_thread_run(data->task);
data->ret = data->worker(data->task, &data->err, data->opaque);
if (data->ret < 0 && data->err == NULL) {
error_setg(&data->err, "Task worker failed but did not set an error");
}
/* We're running in the background thread, and must only
* ever report the task results in the main event loop
* thread. So we schedule an idle callback to report
* the worker results
*/
trace_qio_task_thread_exit(data->task);
g_idle_add(gio_task_thread_result, data);
return NULL;
}
void qio_task_run_in_thread(QIOTask *task,
QIOTaskWorker worker,
gpointer opaque,
GDestroyNotify destroy)
{
struct QIOTaskThreadData *data = g_new0(struct QIOTaskThreadData, 1);
QemuThread thread;
data->task = task;
data->worker = worker;
data->opaque = opaque;
data->destroy = destroy;
trace_qio_task_thread_start(task, worker, opaque);
qemu_thread_create(&thread,
"io-task-worker",
qio_task_thread_worker,
data,
QEMU_THREAD_DETACHED);
}
void qio_task_complete(QIOTask *task)
{
task->func(task->source, NULL, task->opaque);
trace_qio_task_complete(task);
qio_task_free(task);
}
void qio_task_abort(QIOTask *task,
Error *err)
{
task->func(task->source, err, task->opaque);
trace_qio_task_abort(task);
qio_task_free(task);
}
Object *qio_task_get_source(QIOTask *task)
{
object_ref(task->source);
return task->source;
}
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