1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
* 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 QIOTaskThreadData {
QIOTaskWorker worker;
gpointer opaque;
GDestroyNotify destroy;
GMainContext *context;
};
struct QIOTask {
Object *source;
QIOTaskFunc func;
gpointer opaque;
GDestroyNotify destroy;
Error *err;
gpointer result;
GDestroyNotify destroyResult;
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;
trace_qio_task_new(task, source, func, opaque);
return task;
}
static void qio_task_free(QIOTask *task)
{
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);
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;
GSource *idle;
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);
idle = g_idle_source_new();
g_source_set_callback(idle, qio_task_thread_result, task, NULL);
g_source_attach(idle, task->thread->context);
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_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;
}
|
