Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 1 | /* |
| 2 | * QEMU I/O task |
| 3 | * |
| 4 | * Copyright (c) 2015 Red Hat, Inc. |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 18 | * |
| 19 | */ |
| 20 | |
Peter Maydell | cae9fc5 | 2016-01-29 17:50:03 +0000 | [diff] [blame] | 21 | #include "qemu/osdep.h" |
Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 22 | #include "io/task.h" |
Markus Armbruster | da34e65 | 2016-03-14 09:01:28 +0100 | [diff] [blame] | 23 | #include "qapi/error.h" |
Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 24 | #include "qemu/thread.h" |
| 25 | #include "trace.h" |
| 26 | |
| 27 | struct QIOTask { |
| 28 | Object *source; |
| 29 | QIOTaskFunc func; |
| 30 | gpointer opaque; |
| 31 | GDestroyNotify destroy; |
Daniel P. Berrange | 1a447e4 | 2016-08-11 14:40:44 +0100 | [diff] [blame] | 32 | Error *err; |
Daniel P. Berrange | 52dd99e | 2016-08-11 14:36:21 +0100 | [diff] [blame] | 33 | gpointer result; |
| 34 | GDestroyNotify destroyResult; |
Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 35 | }; |
| 36 | |
| 37 | |
| 38 | QIOTask *qio_task_new(Object *source, |
| 39 | QIOTaskFunc func, |
| 40 | gpointer opaque, |
| 41 | GDestroyNotify destroy) |
| 42 | { |
| 43 | QIOTask *task; |
| 44 | |
| 45 | task = g_new0(QIOTask, 1); |
| 46 | |
| 47 | task->source = source; |
| 48 | object_ref(source); |
| 49 | task->func = func; |
| 50 | task->opaque = opaque; |
| 51 | task->destroy = destroy; |
| 52 | |
| 53 | trace_qio_task_new(task, source, func, opaque); |
| 54 | |
| 55 | return task; |
| 56 | } |
| 57 | |
| 58 | static void qio_task_free(QIOTask *task) |
| 59 | { |
| 60 | if (task->destroy) { |
| 61 | task->destroy(task->opaque); |
| 62 | } |
Daniel P. Berrange | 52dd99e | 2016-08-11 14:36:21 +0100 | [diff] [blame] | 63 | if (task->destroyResult) { |
| 64 | task->destroyResult(task->result); |
| 65 | } |
Daniel P. Berrange | 1a447e4 | 2016-08-11 14:40:44 +0100 | [diff] [blame] | 66 | if (task->err) { |
| 67 | error_free(task->err); |
| 68 | } |
Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 69 | object_unref(task->source); |
| 70 | |
| 71 | g_free(task); |
| 72 | } |
| 73 | |
| 74 | |
| 75 | struct QIOTaskThreadData { |
| 76 | QIOTask *task; |
| 77 | QIOTaskWorker worker; |
| 78 | gpointer opaque; |
| 79 | GDestroyNotify destroy; |
Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 80 | }; |
| 81 | |
| 82 | |
| 83 | static gboolean gio_task_thread_result(gpointer opaque) |
| 84 | { |
| 85 | struct QIOTaskThreadData *data = opaque; |
| 86 | |
| 87 | trace_qio_task_thread_result(data->task); |
Daniel P. Berrange | 60e705c | 2016-08-11 15:20:58 +0100 | [diff] [blame] | 88 | qio_task_complete(data->task); |
Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 89 | |
Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 90 | if (data->destroy) { |
| 91 | data->destroy(data->opaque); |
| 92 | } |
| 93 | |
| 94 | g_free(data); |
| 95 | |
| 96 | return FALSE; |
| 97 | } |
| 98 | |
| 99 | |
| 100 | static gpointer qio_task_thread_worker(gpointer opaque) |
| 101 | { |
| 102 | struct QIOTaskThreadData *data = opaque; |
| 103 | |
| 104 | trace_qio_task_thread_run(data->task); |
Daniel P. Berrange | 59de517 | 2016-08-11 17:38:07 +0100 | [diff] [blame] | 105 | data->worker(data->task, data->opaque); |
Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 106 | |
| 107 | /* We're running in the background thread, and must only |
| 108 | * ever report the task results in the main event loop |
| 109 | * thread. So we schedule an idle callback to report |
| 110 | * the worker results |
| 111 | */ |
| 112 | trace_qio_task_thread_exit(data->task); |
| 113 | g_idle_add(gio_task_thread_result, data); |
| 114 | return NULL; |
| 115 | } |
| 116 | |
| 117 | |
| 118 | void qio_task_run_in_thread(QIOTask *task, |
| 119 | QIOTaskWorker worker, |
| 120 | gpointer opaque, |
| 121 | GDestroyNotify destroy) |
| 122 | { |
| 123 | struct QIOTaskThreadData *data = g_new0(struct QIOTaskThreadData, 1); |
| 124 | QemuThread thread; |
| 125 | |
| 126 | data->task = task; |
| 127 | data->worker = worker; |
| 128 | data->opaque = opaque; |
| 129 | data->destroy = destroy; |
| 130 | |
| 131 | trace_qio_task_thread_start(task, worker, opaque); |
| 132 | qemu_thread_create(&thread, |
| 133 | "io-task-worker", |
| 134 | qio_task_thread_worker, |
| 135 | data, |
| 136 | QEMU_THREAD_DETACHED); |
| 137 | } |
| 138 | |
| 139 | |
| 140 | void qio_task_complete(QIOTask *task) |
| 141 | { |
Daniel P. Berrange | 60e705c | 2016-08-11 15:20:58 +0100 | [diff] [blame] | 142 | task->func(task, task->opaque); |
Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 143 | trace_qio_task_complete(task); |
| 144 | qio_task_free(task); |
| 145 | } |
| 146 | |
Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 147 | |
Daniel P. Berrange | 1a447e4 | 2016-08-11 14:40:44 +0100 | [diff] [blame] | 148 | void qio_task_set_error(QIOTask *task, |
| 149 | Error *err) |
| 150 | { |
| 151 | error_propagate(&task->err, err); |
| 152 | } |
| 153 | |
| 154 | |
| 155 | bool qio_task_propagate_error(QIOTask *task, |
| 156 | Error **errp) |
| 157 | { |
| 158 | if (task->err) { |
| 159 | error_propagate(errp, task->err); |
Daniel P. Berrange | 80fb34e | 2017-01-25 11:10:53 +0000 | [diff] [blame] | 160 | task->err = NULL; |
Daniel P. Berrange | 1a447e4 | 2016-08-11 14:40:44 +0100 | [diff] [blame] | 161 | return true; |
| 162 | } |
| 163 | |
| 164 | return false; |
| 165 | } |
| 166 | |
| 167 | |
Daniel P. Berrange | 52dd99e | 2016-08-11 14:36:21 +0100 | [diff] [blame] | 168 | void qio_task_set_result_pointer(QIOTask *task, |
| 169 | gpointer result, |
| 170 | GDestroyNotify destroy) |
| 171 | { |
| 172 | task->result = result; |
| 173 | task->destroyResult = destroy; |
| 174 | } |
| 175 | |
| 176 | |
| 177 | gpointer qio_task_get_result_pointer(QIOTask *task) |
| 178 | { |
| 179 | return task->result; |
| 180 | } |
| 181 | |
| 182 | |
Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 183 | Object *qio_task_get_source(QIOTask *task) |
| 184 | { |
Daniel P. Berrange | b02db2d | 2015-03-18 17:25:45 +0000 | [diff] [blame] | 185 | return task->source; |
| 186 | } |