qemu/io/task.c

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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 2.1 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"
2016-03-14 11:01:28 +03:00
#include "qapi/error.h"
#include "qemu/thread.h"
#include "qom/object.h"
#include "trace.h"
struct QIOTaskThreadData {
QIOTaskWorker worker;
gpointer opaque;
GDestroyNotify destroy;
GMainContext *context;
GSource *completion;
};
struct QIOTask {
Object *source;
QIOTaskFunc func;
gpointer opaque;
GDestroyNotify destroy;
Error *err;
gpointer result;
GDestroyNotify destroyResult;
QemuMutex thread_lock;
QemuCond thread_cond;
struct QIOTaskThreadData *thread;
};
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;
qemu_mutex_init(&task->thread_lock);
qemu_cond_init(&task->thread_cond);
trace_qio_task_new(task, source, func, opaque);
return task;
}
static void qio_task_free(QIOTask *task)
{
qemu_mutex_lock(&task->thread_lock);
if (task->thread) {
if (task->thread->destroy) {
task->thread->destroy(task->thread->opaque);
}
if (task->thread->context) {
g_main_context_unref(task->thread->context);
}
g_free(task->thread);
}
if (task->destroy) {
task->destroy(task->opaque);
}
if (task->destroyResult) {
task->destroyResult(task->result);
}
if (task->err) {
error_free(task->err);
}
object_unref(task->source);
qemu_mutex_unlock(&task->thread_lock);
qemu_mutex_destroy(&task->thread_lock);
qemu_cond_destroy(&task->thread_cond);
g_free(task);
}
static gboolean qio_task_thread_result(gpointer opaque)
{
QIOTask *task = opaque;
trace_qio_task_thread_result(task);
qio_task_complete(task);
return FALSE;
}
static gpointer qio_task_thread_worker(gpointer opaque)
{
QIOTask *task = opaque;
trace_qio_task_thread_run(task);
task->thread->worker(task, task->thread->opaque);
/* 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(task);
qemu_mutex_lock(&task->thread_lock);
task->thread->completion = g_idle_source_new();
g_source_set_callback(task->thread->completion,
qio_task_thread_result, task, NULL);
g_source_attach(task->thread->completion,
task->thread->context);
g_source_unref(task->thread->completion);
trace_qio_task_thread_source_attach(task, task->thread->completion);
qemu_cond_signal(&task->thread_cond);
qemu_mutex_unlock(&task->thread_lock);
return NULL;
}
void qio_task_run_in_thread(QIOTask *task,
QIOTaskWorker worker,
gpointer opaque,
GDestroyNotify destroy,
GMainContext *context)
{
struct QIOTaskThreadData *data = g_new0(struct QIOTaskThreadData, 1);
QemuThread thread;
if (context) {
g_main_context_ref(context);
}
data->worker = worker;
data->opaque = opaque;
data->destroy = destroy;
data->context = context;
task->thread = data;
trace_qio_task_thread_start(task, worker, opaque);
qemu_thread_create(&thread,
"io-task-worker",
qio_task_thread_worker,
task,
QEMU_THREAD_DETACHED);
}
void qio_task_wait_thread(QIOTask *task)
{
qemu_mutex_lock(&task->thread_lock);
g_assert(task->thread != NULL);
while (task->thread->completion == NULL) {
qemu_cond_wait(&task->thread_cond, &task->thread_lock);
}
trace_qio_task_thread_source_cancel(task, task->thread->completion);
g_source_destroy(task->thread->completion);
qemu_mutex_unlock(&task->thread_lock);
qio_task_thread_result(task);
}
void qio_task_complete(QIOTask *task)
{
task->func(task, task->opaque);
trace_qio_task_complete(task);
qio_task_free(task);
}
void qio_task_set_error(QIOTask *task,
Error *err)
{
error_propagate(&task->err, err);
}
bool qio_task_propagate_error(QIOTask *task,
Error **errp)
{
if (task->err) {
error_propagate(errp, task->err);
task->err = NULL;
return true;
}
return false;
}
void qio_task_set_result_pointer(QIOTask *task,
gpointer result,
GDestroyNotify destroy)
{
task->result = result;
task->destroyResult = destroy;
}
gpointer qio_task_get_result_pointer(QIOTask *task)
{
return task->result;
}
Object *qio_task_get_source(QIOTask *task)
{
return task->source;
}