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1 : : /* GIO - GLib Input, Output and Streaming Library
2 : : *
3 : : * Copyright (C) 2006-2007 Red Hat, Inc.
4 : : *
5 : : * SPDX-License-Identifier: LGPL-2.1-or-later
6 : : *
7 : : * This library is free software; you can redistribute it and/or
8 : : * modify it under the terms of the GNU Lesser General Public
9 : : * License as published by the Free Software Foundation; either
10 : : * version 2.1 of the License, or (at your option) any later version.
11 : : *
12 : : * This library is distributed in the hope that it will be useful,
13 : : * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 : : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 : : * Lesser General Public License for more details.
16 : : *
17 : : * You should have received a copy of the GNU Lesser General
18 : : * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
19 : : *
20 : : * Author: Alexander Larsson <alexl@redhat.com>
21 : : */
22 : :
23 : : #include "config.h"
24 : :
25 : : #include "gioscheduler.h"
26 : : #include "gcancellable.h"
27 : : #include "gtask.h"
28 : :
29 : : struct _GIOSchedulerJob {
30 : : GList *active_link;
31 : : GTask *task;
32 : :
33 : : GIOSchedulerJobFunc job_func;
34 : : gpointer data;
35 : : GDestroyNotify destroy_notify;
36 : :
37 : : GCancellable *cancellable;
38 : : gulong cancellable_id;
39 : : GMainContext *context;
40 : : };
41 : :
42 : : G_LOCK_DEFINE_STATIC(active_jobs);
43 : : static GList *active_jobs = NULL;
44 : :
45 : : static void
46 : 0 : g_io_job_free (GIOSchedulerJob *job)
47 : : {
48 [ # # ]: 0 : if (job->destroy_notify)
49 : 0 : job->destroy_notify (job->data);
50 : :
51 : 0 : G_LOCK (active_jobs);
52 : 0 : active_jobs = g_list_delete_link (active_jobs, job->active_link);
53 : 0 : G_UNLOCK (active_jobs);
54 : :
55 [ # # ]: 0 : if (job->cancellable)
56 : 0 : g_object_unref (job->cancellable);
57 : 0 : g_main_context_unref (job->context);
58 : 0 : g_slice_free (GIOSchedulerJob, job);
59 : 0 : }
60 : :
61 : : static void
62 : 0 : io_job_thread (GTask *task,
63 : : gpointer source_object,
64 : : gpointer task_data,
65 : : GCancellable *cancellable)
66 : : {
67 : 0 : GIOSchedulerJob *job = task_data;
68 : : gboolean result;
69 : :
70 [ # # ]: 0 : if (job->cancellable)
71 : 0 : g_cancellable_push_current (job->cancellable);
72 : :
73 : : do
74 : : {
75 : 0 : result = job->job_func (job, job->cancellable, job->data);
76 : : }
77 [ # # ]: 0 : while (result);
78 : :
79 [ # # ]: 0 : if (job->cancellable)
80 : 0 : g_cancellable_pop_current (job->cancellable);
81 : 0 : }
82 : :
83 : : /**
84 : : * g_io_scheduler_push_job:
85 : : * @job_func: a #GIOSchedulerJobFunc.
86 : : * @user_data: data to pass to @job_func
87 : : * @notify: (nullable): a #GDestroyNotify for @user_data, or %NULL
88 : : * @io_priority: the [I/O priority](iface.AsyncResult.html#io-priority)
89 : : * of the request.
90 : : * @cancellable: optional #GCancellable object, %NULL to ignore.
91 : : *
92 : : * Schedules the I/O job to run in another thread.
93 : : *
94 : : * @notify will be called on @user_data after @job_func has returned,
95 : : * regardless whether the job was cancelled or has run to completion.
96 : : *
97 : : * If @cancellable is not %NULL, it can be used to cancel the I/O job
98 : : * by calling g_cancellable_cancel() or by calling
99 : : * g_io_scheduler_cancel_all_jobs().
100 : : *
101 : : * Deprecated: 2.36: use #GThreadPool or g_task_run_in_thread()
102 : : **/
103 : : void
104 : 0 : g_io_scheduler_push_job (GIOSchedulerJobFunc job_func,
105 : : gpointer user_data,
106 : : GDestroyNotify notify,
107 : : gint io_priority,
108 : : GCancellable *cancellable)
109 : : {
110 : : GIOSchedulerJob *job;
111 : : GTask *task;
112 : :
113 : 0 : g_return_if_fail (job_func != NULL);
114 : :
115 : 0 : job = g_slice_new0 (GIOSchedulerJob);
116 : 0 : job->job_func = job_func;
117 : 0 : job->data = user_data;
118 : 0 : job->destroy_notify = notify;
119 : :
120 [ # # ]: 0 : if (cancellable)
121 : 0 : job->cancellable = g_object_ref (cancellable);
122 : :
123 : 0 : job->context = g_main_context_ref_thread_default ();
124 : :
125 : 0 : G_LOCK (active_jobs);
126 : 0 : active_jobs = g_list_prepend (active_jobs, job);
127 : 0 : job->active_link = active_jobs;
128 : 0 : G_UNLOCK (active_jobs);
129 : :
130 : 0 : task = g_task_new (NULL, cancellable, NULL, NULL);
131 : : G_GNUC_BEGIN_IGNORE_DEPRECATIONS
132 [ # # ]: 0 : g_task_set_source_tag (task, g_io_scheduler_push_job);
133 : : G_GNUC_END_IGNORE_DEPRECATIONS
134 : 0 : g_task_set_task_data (task, job, (GDestroyNotify)g_io_job_free);
135 : 0 : g_task_set_priority (task, io_priority);
136 : 0 : g_task_run_in_thread (task, io_job_thread);
137 : 0 : g_object_unref (task);
138 : : }
139 : :
140 : : /**
141 : : * g_io_scheduler_cancel_all_jobs:
142 : : *
143 : : * Cancels all cancellable I/O jobs.
144 : : *
145 : : * A job is cancellable if a #GCancellable was passed into
146 : : * g_io_scheduler_push_job().
147 : : *
148 : : * Deprecated: 2.36: You should never call this function, since you don't
149 : : * know how other libraries in your program might be making use of
150 : : * gioscheduler.
151 : : **/
152 : : void
153 : 0 : g_io_scheduler_cancel_all_jobs (void)
154 : : {
155 : : GList *cancellable_list, *l;
156 : :
157 : 0 : G_LOCK (active_jobs);
158 : 0 : cancellable_list = NULL;
159 [ # # ]: 0 : for (l = active_jobs; l != NULL; l = l->next)
160 : : {
161 : 0 : GIOSchedulerJob *job = l->data;
162 [ # # ]: 0 : if (job->cancellable)
163 : 0 : cancellable_list = g_list_prepend (cancellable_list,
164 : 0 : g_object_ref (job->cancellable));
165 : : }
166 : 0 : G_UNLOCK (active_jobs);
167 : :
168 [ # # ]: 0 : for (l = cancellable_list; l != NULL; l = l->next)
169 : : {
170 : 0 : GCancellable *c = l->data;
171 : 0 : g_cancellable_cancel (c);
172 : 0 : g_object_unref (c);
173 : : }
174 : 0 : g_list_free (cancellable_list);
175 : 0 : }
176 : :
177 : : typedef struct {
178 : : GSourceFunc func;
179 : : gboolean ret_val;
180 : : gpointer data;
181 : : GDestroyNotify notify;
182 : :
183 : : GMutex ack_lock;
184 : : GCond ack_condition;
185 : : gboolean ack;
186 : : } MainLoopProxy;
187 : :
188 : : static gboolean
189 : 0 : mainloop_proxy_func (gpointer data)
190 : : {
191 : 0 : MainLoopProxy *proxy = data;
192 : :
193 : 0 : proxy->ret_val = proxy->func (proxy->data);
194 : :
195 [ # # ]: 0 : if (proxy->notify)
196 : 0 : proxy->notify (proxy->data);
197 : :
198 : 0 : g_mutex_lock (&proxy->ack_lock);
199 : 0 : proxy->ack = TRUE;
200 : 0 : g_cond_signal (&proxy->ack_condition);
201 : 0 : g_mutex_unlock (&proxy->ack_lock);
202 : :
203 : 0 : return FALSE;
204 : : }
205 : :
206 : : static void
207 : 0 : mainloop_proxy_free (MainLoopProxy *proxy)
208 : : {
209 : 0 : g_mutex_clear (&proxy->ack_lock);
210 : 0 : g_cond_clear (&proxy->ack_condition);
211 : 0 : g_free (proxy);
212 : 0 : }
213 : :
214 : : /**
215 : : * g_io_scheduler_job_send_to_mainloop:
216 : : * @job: a #GIOSchedulerJob
217 : : * @func: a #GSourceFunc callback that will be called in the original thread
218 : : * @user_data: data to pass to @func
219 : : * @notify: (nullable): a #GDestroyNotify for @user_data, or %NULL
220 : : *
221 : : * Used from an I/O job to send a callback to be run in the thread
222 : : * that the job was started from, waiting for the result (and thus
223 : : * blocking the I/O job).
224 : : *
225 : : * Returns: The return value of @func
226 : : *
227 : : * Deprecated: 2.36: Use g_main_context_invoke().
228 : : **/
229 : : gboolean
230 : 0 : g_io_scheduler_job_send_to_mainloop (GIOSchedulerJob *job,
231 : : GSourceFunc func,
232 : : gpointer user_data,
233 : : GDestroyNotify notify)
234 : : {
235 : : GSource *source;
236 : : MainLoopProxy *proxy;
237 : : gboolean ret_val;
238 : :
239 : 0 : g_return_val_if_fail (job != NULL, FALSE);
240 : 0 : g_return_val_if_fail (func != NULL, FALSE);
241 : :
242 : 0 : proxy = g_new0 (MainLoopProxy, 1);
243 : 0 : proxy->func = func;
244 : 0 : proxy->data = user_data;
245 : 0 : proxy->notify = notify;
246 : 0 : g_mutex_init (&proxy->ack_lock);
247 : 0 : g_cond_init (&proxy->ack_condition);
248 : 0 : g_mutex_lock (&proxy->ack_lock);
249 : :
250 : 0 : source = g_idle_source_new ();
251 : 0 : g_source_set_priority (source, G_PRIORITY_DEFAULT);
252 : 0 : g_source_set_callback (source, mainloop_proxy_func, proxy,
253 : : NULL);
254 : 0 : g_source_set_static_name (source, "[gio] mainloop_proxy_func");
255 : :
256 : 0 : g_source_attach (source, job->context);
257 : 0 : g_source_unref (source);
258 : :
259 [ # # ]: 0 : while (!proxy->ack)
260 : 0 : g_cond_wait (&proxy->ack_condition, &proxy->ack_lock);
261 : 0 : g_mutex_unlock (&proxy->ack_lock);
262 : :
263 : 0 : ret_val = proxy->ret_val;
264 : 0 : mainloop_proxy_free (proxy);
265 : :
266 : 0 : return ret_val;
267 : : }
268 : :
269 : : /**
270 : : * g_io_scheduler_job_send_to_mainloop_async:
271 : : * @job: a #GIOSchedulerJob
272 : : * @func: a #GSourceFunc callback that will be called in the original thread
273 : : * @user_data: data to pass to @func
274 : : * @notify: (nullable): a #GDestroyNotify for @user_data, or %NULL
275 : : *
276 : : * Used from an I/O job to send a callback to be run asynchronously in
277 : : * the thread that the job was started from. The callback will be run
278 : : * when the main loop is available, but at that time the I/O job might
279 : : * have finished. The return value from the callback is ignored.
280 : : *
281 : : * Note that if you are passing the @user_data from g_io_scheduler_push_job()
282 : : * on to this function you have to ensure that it is not freed before
283 : : * @func is called, either by passing %NULL as @notify to
284 : : * g_io_scheduler_push_job() or by using refcounting for @user_data.
285 : : *
286 : : * Deprecated: 2.36: Use g_main_context_invoke().
287 : : **/
288 : : void
289 : 0 : g_io_scheduler_job_send_to_mainloop_async (GIOSchedulerJob *job,
290 : : GSourceFunc func,
291 : : gpointer user_data,
292 : : GDestroyNotify notify)
293 : : {
294 : : GSource *source;
295 : : MainLoopProxy *proxy;
296 : :
297 : 0 : g_return_if_fail (job != NULL);
298 : 0 : g_return_if_fail (func != NULL);
299 : :
300 : 0 : proxy = g_new0 (MainLoopProxy, 1);
301 : 0 : proxy->func = func;
302 : 0 : proxy->data = user_data;
303 : 0 : proxy->notify = notify;
304 : 0 : g_mutex_init (&proxy->ack_lock);
305 : 0 : g_cond_init (&proxy->ack_condition);
306 : :
307 : 0 : source = g_idle_source_new ();
308 : 0 : g_source_set_priority (source, G_PRIORITY_DEFAULT);
309 : 0 : g_source_set_callback (source, mainloop_proxy_func, proxy,
310 : : (GDestroyNotify)mainloop_proxy_free);
311 : 0 : g_source_set_static_name (source, "[gio] mainloop_proxy_func");
312 : :
313 : 0 : g_source_attach (source, job->context);
314 : 0 : g_source_unref (source);
315 : : }
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