gio/gfilemonitor.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #include "config.h"
  24 #include <string.h>
  25
  26 #include "gfilemonitor.h"
  27 #include "gioenumtypes.h"
  28 #include "gfile.h"
  29 #include "gvfs.h"
  30 #include "glibintl.h"
  31
  32
  33 struct _FileChange;
  34 typedef struct _FileChange FileChange;
  35 static void file_change_free (FileChange *change);
  36
  37 /**
  38  * SECTION:gfilemonitor
  39  * @short_description: File Monitor
  40  * @include: gio/gio.h
  41  *
  42  * Monitors a file or directory for changes.
  43  *
  44  * To obtain a #GFileMonitor for a file or directory, use
  45  * g_file_monitor(), g_file_monitor_file(), or
  46  * g_file_monitor_directory().
  47  *
  48  * To get informed about changes to the file or directory you are
  49  * monitoring, connect to the #GFileMonitor::changed signal. The
  50  * signal will be emitted in the <link
  51  * linkend="g-main-context-push-thread-default">thread-default main
  52  * context</link> of the thread that the monitor was created in
  53  * (though if the global default main context is blocked, this may
  54  * cause notifications to be blocked even if the thread-default
  55  * context is still running).
  56  **/
  57
  58 G_LOCK_DEFINE_STATIC(cancelled);
  59
  60 enum {
  61   CHANGED,
  62   LAST_SIGNAL
  63 };
  64
  65 typedef struct {
  66   GFile *file;
  67   guint32 last_sent_change_time; /* 0 == not sent */
  68   guint32 send_delayed_change_at; /* 0 == never */
  69   guint32 send_virtual_changes_done_at; /* 0 == never */
  70 } RateLimiter;
  71
  72 struct _GFileMonitorPrivate {
  73   gboolean cancelled;
  74   int rate_limit_msec;
  75
  76   /* Rate limiting change events */
  77   GHashTable *rate_limiter;
  78
  79   GMutex mutex;
  80   GSource *pending_file_change_source;
  81   GSList *pending_file_changes; /* FileChange */
  82
  83   GSource *timeout;
  84   guint32 timeout_fires_at;
  85
  86   GMainContext *context;
  87 };
  88
  89 enum {
  90   PROP_0,
  91   PROP_RATE_LIMIT,
  92   PROP_CANCELLED,
  93   PROP_CONTEXT
  94 };
  95
  96 /* work around a limitation of the aliasing foo */
  97 #undef g_file_monitor
  98
  99 G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GFileMonitor, g_file_monitor, G_TYPE_OBJECT)
 100
 101 static void
 102 g_file_monitor_set_property (GObject      *object,
 103                              guint         prop_id,
 104                              const GValue *value,
 105                              GParamSpec   *pspec)
 106 {
 107   GFileMonitor *monitor;
 108
 109   monitor = G_FILE_MONITOR (object);
 110
 111   switch (prop_id)
 112     {
 113     case PROP_RATE_LIMIT:
 114       g_file_monitor_set_rate_limit (monitor, g_value_get_int (value));
 115       break;
 116
 117     case PROP_CONTEXT:
 118       monitor->priv->context = g_value_dup_boxed (value);
 119       if (monitor->priv->context == NULL)
 120         monitor->priv->context = g_main_context_ref_thread_default ();
 121       break;
 122
 123     default:
 124       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 125       break;
 126     }
 127 }
 128
 129 static void
 130 g_file_monitor_get_property (GObject    *object,
 131                              guint       prop_id,
 132                              GValue     *value,
 133                              GParamSpec *pspec)
 134 {
 135   GFileMonitor *monitor;
 136   GFileMonitorPrivate *priv;
 137
 138   monitor = G_FILE_MONITOR (object);
 139   priv = monitor->priv;
 140
 141   switch (prop_id)
 142     {
 143     case PROP_RATE_LIMIT:
 144       g_value_set_int (value, priv->rate_limit_msec);
 145       break;
 146
 147     case PROP_CANCELLED:
 148       G_LOCK (cancelled);
 149       g_value_set_boolean (value, priv->cancelled);
 150       G_UNLOCK (cancelled);
 151       break;
 152
 153     default:
 154       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 155       break;
 156     }
 157 }
 158
 159 #define DEFAULT_RATE_LIMIT_MSECS 800
 160 #define DEFAULT_VIRTUAL_CHANGES_DONE_DELAY_SECS 2
 161
 162 static guint signals[LAST_SIGNAL] = { 0 };
 163
 164 static void
 165 rate_limiter_free (RateLimiter *limiter)
 166 {
 167   g_object_unref (limiter->file);
 168   g_slice_free (RateLimiter, limiter);
 169 }
 170
 171 static void
 172 g_file_monitor_finalize (GObject *object)
 173 {
 174   GFileMonitor *monitor;
 175
 176   monitor = G_FILE_MONITOR (object);
 177
 178   if (monitor->priv->timeout)
 179     {
 180       g_source_destroy (monitor->priv->timeout);
 181       g_source_unref (monitor->priv->timeout);
 182     }
 183
 184   g_hash_table_destroy (monitor->priv->rate_limiter);
 185
 186   g_main_context_unref (monitor->priv->context);
 187   g_mutex_clear (&monitor->priv->mutex);
 188
 189   G_OBJECT_CLASS (g_file_monitor_parent_class)->finalize (object);
 190 }
 191
 192 static void
 193 g_file_monitor_dispose (GObject *object)
 194 {
 195   GFileMonitor *monitor;
 196   GFileMonitorPrivate *priv;
 197
 198   monitor = G_FILE_MONITOR (object);
 199   priv = monitor->priv;
 200
 201   if (priv->pending_file_change_source)
 202     {
 203       g_source_destroy (priv->pending_file_change_source);
 204       g_source_unref (priv->pending_file_change_source);
 205       priv->pending_file_change_source = NULL;
 206     }
 207   g_slist_free_full (priv->pending_file_changes, (GDestroyNotify) file_change_free);
 208   priv->pending_file_changes = NULL;
 209
 210   /* Make sure we cancel on last unref */
 211   g_file_monitor_cancel (monitor);
 212
 213   G_OBJECT_CLASS (g_file_monitor_parent_class)->dispose (object);
 214 }
 215
 216 static void
 217 g_file_monitor_class_init (GFileMonitorClass *klass)
 218 {
 219   GObjectClass *object_class;
 220
 221   object_class = G_OBJECT_CLASS (klass);
 222   object_class->finalize = g_file_monitor_finalize;
 223   object_class->dispose = g_file_monitor_dispose;
 224   object_class->get_property = g_file_monitor_get_property;
 225   object_class->set_property = g_file_monitor_set_property;
 226
 227   /**
 228    * GFileMonitor::changed:
 229    * @monitor: a #GFileMonitor.
 230    * @file: a #GFile.
 231    * @other_file: (allow-none): a #GFile or #NULL.
 232    * @event_type: a #GFileMonitorEvent.
 233    *
 234    * Emitted when @file has been changed.
 235    *
 236    * If using #G_FILE_MONITOR_SEND_MOVED flag and @event_type is
 237    * #G_FILE_MONITOR_EVENT_MOVED, @file will be set to a #GFile containing the
 238    * old path, and @other_file will be set to a #GFile containing the new path.
 239    *
 240    * In all the other cases, @other_file will be set to #NULL.
 241    **/
 242   signals[CHANGED] =
 243     g_signal_new (I_("changed"),
 244                   G_TYPE_FILE_MONITOR,
 245                   G_SIGNAL_RUN_LAST,
 246                   G_STRUCT_OFFSET (GFileMonitorClass, changed),
 247                   NULL, NULL,
 248                   NULL,
 249                   G_TYPE_NONE, 3,
 250                   G_TYPE_FILE, G_TYPE_FILE, G_TYPE_FILE_MONITOR_EVENT);
 251
 252   g_object_class_install_property (object_class,
 253                                    PROP_RATE_LIMIT,
 254                                    g_param_spec_int ("rate-limit",
 255                                                      P_("Rate limit"),
 256                                                      P_("The limit of the monitor to watch for changes, in milliseconds"),
 257                                                      0, G_MAXINT,
 258                                                      DEFAULT_RATE_LIMIT_MSECS,
 259                                                      G_PARAM_READWRITE|
 260                                                      G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 261
 262   g_object_class_install_property (object_class,
 263                                    PROP_CANCELLED,
 264                                    g_param_spec_boolean ("cancelled",
 265                                                          P_("Cancelled"),
 266                                                          P_("Whether the monitor has been cancelled"),
 267                                                          FALSE,
 268                                                          G_PARAM_READABLE|
 269                                                          G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 270
 271   g_object_class_install_property (object_class,
 272                                    PROP_CONTEXT,
 273                                    g_param_spec_boxed ("context",
 274                                                        P_("Context"),
 275                                                        P_("The main context to dispatch from"),
 276                                                        G_TYPE_MAIN_CONTEXT, G_PARAM_WRITABLE |
 277                                                        G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
 278 }
 279
 280 static void
 281 g_file_monitor_init (GFileMonitor *monitor)
 282 {
 283   monitor->priv = g_file_monitor_get_instance_private (monitor);
 284   monitor->priv->rate_limit_msec = DEFAULT_RATE_LIMIT_MSECS;
 285   monitor->priv->rate_limiter = g_hash_table_new_full (g_file_hash, (GEqualFunc)g_file_equal,
 286                                                        NULL, (GDestroyNotify) rate_limiter_free);
 287   g_mutex_init (&monitor->priv->mutex);
 288 }
 289
 290 /**
 291  * g_file_monitor_is_cancelled:
 292  * @monitor: a #GFileMonitor
 293  *
 294  * Returns whether the monitor is canceled.
 295  *
 296  * Returns: %TRUE if monitor is canceled. %FALSE otherwise.
 297  **/
 298 gboolean
 299 g_file_monitor_is_cancelled (GFileMonitor *monitor)
 300 {
 301   gboolean res;
 302
 303   g_return_val_if_fail (G_IS_FILE_MONITOR (monitor), FALSE);
 304
 305   G_LOCK (cancelled);
 306   res = monitor->priv->cancelled;
 307   G_UNLOCK (cancelled);
 308
 309   return res;
 310 }
 311
 312 /**
 313  * g_file_monitor_cancel:
 314  * @monitor: a #GFileMonitor.
 315  *
 316  * Cancels a file monitor.
 317  *
 318  * Returns: %TRUE if monitor was cancelled.
 319  **/
 320 gboolean
 321 g_file_monitor_cancel (GFileMonitor* monitor)
 322 {
 323   GFileMonitorClass *klass;
 324
 325   g_return_val_if_fail (G_IS_FILE_MONITOR (monitor), FALSE);
 326
 327   G_LOCK (cancelled);
 328   if (monitor->priv->cancelled)
 329     {
 330       G_UNLOCK (cancelled);
 331       return TRUE;
 332     }
 333
 334   monitor->priv->cancelled = TRUE;
 335   G_UNLOCK (cancelled);
 336
 337   g_object_notify (G_OBJECT (monitor), "cancelled");
 338
 339   klass = G_FILE_MONITOR_GET_CLASS (monitor);
 340   return (* klass->cancel) (monitor);
 341 }
 342
 343 /**
 344  * g_file_monitor_set_rate_limit:
 345  * @monitor: a #GFileMonitor.
 346  * @limit_msecs: a non-negative integer with the limit in milliseconds
 347  *     to poll for changes
 348  *
 349  * Sets the rate limit to which the @monitor will report
 350  * consecutive change events to the same file.
 351  */
 352 void
 353 g_file_monitor_set_rate_limit (GFileMonitor *monitor,
 354                                gint          limit_msecs)
 355 {
 356   GFileMonitorPrivate *priv;
 357
 358   g_return_if_fail (G_IS_FILE_MONITOR (monitor));
 359   g_return_if_fail (limit_msecs >= 0);
 360
 361   priv = monitor->priv;
 362   if (priv->rate_limit_msec != limit_msecs)
 363     {
 364       monitor->priv->rate_limit_msec = limit_msecs;
 365       g_object_notify (G_OBJECT (monitor), "rate-limit");
 366     }
 367 }
 368
 369 struct _FileChange {
 370   GFile             *child;
 371   GFile             *other_file;
 372   GFileMonitorEvent  event_type;
 373 };
 374
 375 static void
 376 file_change_free (FileChange *change)
 377 {
 378   g_object_unref (change->child);
 379   if (change->other_file)
 380     g_object_unref (change->other_file);
 381
 382   g_slice_free (FileChange, change);
 383 }
 384
 385 static gboolean
 386 emit_cb (gpointer data)
 387 {
 388   GFileMonitor *monitor = G_FILE_MONITOR (data);
 389   GSList *pending, *iter;
 390
 391   g_mutex_lock (&monitor->priv->mutex);
 392   pending = g_slist_reverse (monitor->priv->pending_file_changes);
 393   monitor->priv->pending_file_changes = NULL;
 394   if (monitor->priv->pending_file_change_source)
 395     {
 396       g_source_unref (monitor->priv->pending_file_change_source);
 397       monitor->priv->pending_file_change_source = NULL;
 398     }
 399   g_mutex_unlock (&monitor->priv->mutex);
 400
 401   g_object_ref (monitor);
 402   for (iter = pending; iter; iter = iter->next)
 403     {
 404        FileChange *change = iter->data;
 405
 406        g_signal_emit (monitor, signals[CHANGED], 0,
 407                       change->child, change->other_file, change->event_type);
 408        file_change_free (change);
 409     }
 410   g_slist_free (pending);
 411   g_object_unref (monitor);
 412
 413   return FALSE;
 414 }
 415
 416 static void
 417 emit_in_idle (GFileMonitor      *monitor,
 418               GFile             *child,
 419               GFile             *other_file,
 420               GFileMonitorEvent  event_type)
 421 {
 422   GSource *source;
 423   FileChange *change;
 424   GFileMonitorPrivate *priv;
 425
 426   priv = monitor->priv;
 427
 428   change = g_slice_new (FileChange);
 429
 430   change->child = g_object_ref (child);
 431   if (other_file)
 432     change->other_file = g_object_ref (other_file);
 433   else
 434     change->other_file = NULL;
 435   change->event_type = event_type;
 436
 437   g_mutex_lock (&monitor->priv->mutex);
 438   if (!priv->pending_file_change_source)
 439     {
 440       source = g_idle_source_new ();
 441       priv->pending_file_change_source = source;
 442       g_source_set_priority (source, 0);
 443
 444       /* We don't ref monitor here - instead dispose will free any
 445        * pending idles.
 446        */
 447       g_source_set_callback (source, emit_cb, monitor, NULL);
 448       g_source_attach (source, monitor->priv->context);
 449     }
 450   /* We reverse this in the processor */
 451   priv->pending_file_changes = g_slist_prepend (priv->pending_file_changes, change);
 452   g_mutex_unlock (&monitor->priv->mutex);
 453 }
 454
 455 static guint32
 456 get_time_msecs (void)
 457 {
 458   return g_get_monotonic_time () / G_TIME_SPAN_MILLISECOND;
 459 }
 460
 461 static guint32
 462 time_difference (guint32 from, guint32 to)
 463 {
 464   if (from > to)
 465     return 0;
 466   return to - from;
 467 }
 468
 469 /* Change event rate limiting support: */
 470
 471 static RateLimiter *
 472 new_limiter (GFileMonitor *monitor,
 473              GFile             *file)
 474 {
 475   RateLimiter *limiter;
 476
 477   limiter = g_slice_new0 (RateLimiter);
 478   limiter->file = g_object_ref (file);
 479   g_hash_table_insert (monitor->priv->rate_limiter, file, limiter);
 480
 481   return limiter;
 482 }
 483
 484 static void
 485 rate_limiter_send_virtual_changes_done_now (GFileMonitor *monitor,
 486                                             RateLimiter  *limiter)
 487 {
 488   if (limiter->send_virtual_changes_done_at != 0)
 489     {
 490       emit_in_idle (monitor, limiter->file, NULL,
 491                     G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT);
 492       limiter->send_virtual_changes_done_at = 0;
 493     }
 494 }
 495
 496 static void
 497 rate_limiter_send_delayed_change_now (GFileMonitor *monitor,
 498                                       RateLimiter *limiter,
 499                                       guint32 time_now)
 500 {
 501   if (limiter->send_delayed_change_at != 0)
 502     {
 503       emit_in_idle (monitor,
 504                     limiter->file, NULL,
 505                     G_FILE_MONITOR_EVENT_CHANGED);
 506       limiter->send_delayed_change_at = 0;
 507       limiter->last_sent_change_time = time_now;
 508     }
 509 }
 510
 511 typedef struct {
 512   guint32 min_time;
 513   guint32 time_now;
 514   GFileMonitor *monitor;
 515 } ForEachData;
 516
 517 static gboolean
 518 calc_min_time (GFileMonitor *monitor,
 519                RateLimiter *limiter,
 520                guint32 time_now,
 521                guint32 *min_time)
 522 {
 523   gboolean delete_me;
 524   guint32 expire_at;
 525
 526   delete_me = TRUE;
 527
 528   if (limiter->last_sent_change_time != 0)
 529     {
 530       /* Set a timeout at 2*rate limit so that we can clear out the change from the hash eventually */
 531       expire_at = limiter->last_sent_change_time + 2 * monitor->priv->rate_limit_msec;
 532
 533       if (time_difference (time_now, expire_at) > 0)
 534         {
 535           delete_me = FALSE;
 536           *min_time = MIN (*min_time,
 537                            time_difference (time_now, expire_at));
 538         }
 539     }
 540
 541   if (limiter->send_delayed_change_at != 0)
 542     {
 543       delete_me = FALSE;
 544       *min_time = MIN (*min_time,
 545                        time_difference (time_now, limiter->send_delayed_change_at));
 546     }
 547
 548   if (limiter->send_virtual_changes_done_at != 0)
 549     {
 550       delete_me = FALSE;
 551       *min_time = MIN (*min_time,
 552                        time_difference (time_now, limiter->send_virtual_changes_done_at));
 553     }
 554
 555   return delete_me;
 556 }
 557
 558 static gboolean
 559 foreach_rate_limiter_fire (gpointer key,
 560                            gpointer value,
 561                            gpointer user_data)
 562 {
 563   RateLimiter *limiter = value;
 564   ForEachData *data = user_data;
 565
 566   if (limiter->send_delayed_change_at != 0 &&
 567       time_difference (data->time_now, limiter->send_delayed_change_at) == 0)
 568     rate_limiter_send_delayed_change_now (data->monitor, limiter, data->time_now);
 569
 570   if (limiter->send_virtual_changes_done_at != 0 &&
 571       time_difference (data->time_now, limiter->send_virtual_changes_done_at) == 0)
 572     rate_limiter_send_virtual_changes_done_now (data->monitor, limiter);
 573
 574   return calc_min_time (data->monitor, limiter, data->time_now, &data->min_time);
 575 }
 576
 577 static gboolean
 578 rate_limiter_timeout (gpointer timeout_data)
 579 {
 580   GFileMonitor *monitor = timeout_data;
 581   ForEachData data;
 582   GSource *source;
 583
 584   data.min_time = G_MAXUINT32;
 585   data.monitor = monitor;
 586   data.time_now = get_time_msecs ();
 587   g_hash_table_foreach_remove (monitor->priv->rate_limiter,
 588                                foreach_rate_limiter_fire,
 589                                &data);
 590
 591   /* Remove old timeout */
 592   if (monitor->priv->timeout)
 593     {
 594       g_source_destroy (monitor->priv->timeout);
 595       g_source_unref (monitor->priv->timeout);
 596       monitor->priv->timeout = NULL;
 597       monitor->priv->timeout_fires_at = 0;
 598     }
 599
 600   /* Set up new timeout */
 601   if (data.min_time != G_MAXUINT32)
 602     {
 603       source = g_timeout_source_new (data.min_time + 1); /* + 1 to make sure we've really passed the time */
 604       g_source_set_callback (source, rate_limiter_timeout, monitor, NULL);
 605       g_source_attach (source, monitor->priv->context);
 606
 607       monitor->priv->timeout = source;
 608       monitor->priv->timeout_fires_at = data.time_now + data.min_time;
 609     }
 610
 611   return FALSE;
 612 }
 613
 614 static gboolean
 615 foreach_rate_limiter_update (gpointer key,
 616                              gpointer value,
 617                              gpointer user_data)
 618 {
 619   RateLimiter *limiter = value;
 620   ForEachData *data = user_data;
 621
 622   return calc_min_time (data->monitor, limiter, data->time_now, &data->min_time);
 623 }
 624
 625 static void
 626 update_rate_limiter_timeout (GFileMonitor *monitor,
 627                              guint new_time)
 628 {
 629   ForEachData data;
 630   GSource *source;
 631
 632   if (monitor->priv->timeout_fires_at != 0 && new_time != 0 &&
 633       time_difference (new_time, monitor->priv->timeout_fires_at) == 0)
 634     return; /* Nothing to do, we already fire earlier than that */
 635
 636   data.min_time = G_MAXUINT32;
 637   data.monitor = monitor;
 638   data.time_now = get_time_msecs ();
 639   g_hash_table_foreach_remove (monitor->priv->rate_limiter,
 640                                foreach_rate_limiter_update,
 641                                &data);
 642
 643   /* Remove old timeout */
 644   if (monitor->priv->timeout)
 645     {
 646       g_source_destroy (monitor->priv->timeout);
 647       g_source_unref (monitor->priv->timeout);
 648       monitor->priv->timeout_fires_at = 0;
 649       monitor->priv->timeout = NULL;
 650     }
 651
 652   /* Set up new timeout */
 653   if (data.min_time != G_MAXUINT32)
 654     {
 655       source = g_timeout_source_new (data.min_time + 1);  /* + 1 to make sure we've really passed the time */
 656       g_source_set_callback (source, rate_limiter_timeout, monitor, NULL);
 657       g_source_attach (source, monitor->priv->context);
 658
 659       monitor->priv->timeout = source;
 660       monitor->priv->timeout_fires_at = data.time_now + data.min_time;
 661     }
 662 }
 663
 664 /**
 665  * g_file_monitor_emit_event:
 666  * @monitor: a #GFileMonitor.
 667  * @child: a #GFile.
 668  * @other_file: a #GFile.
 669  * @event_type: a set of #GFileMonitorEvent flags.
 670  *
 671  * Emits the #GFileMonitor::changed signal if a change
 672  * has taken place. Should be called from file monitor
 673  * implementations only.
 674  *
 675  * The signal will be emitted from an idle handler (in the <link
 676  * linkend="g-main-context-push-thread-default">thread-default main
 677  * context</link>).
 678  **/
 679 void
 680 g_file_monitor_emit_event (GFileMonitor      *monitor,
 681                            GFile             *child,
 682                            GFile             *other_file,
 683                            GFileMonitorEvent  event_type)
 684 {
 685   guint32 time_now, since_last;
 686   gboolean emit_now;
 687   RateLimiter *limiter;
 688
 689   g_return_if_fail (G_IS_FILE_MONITOR (monitor));
 690   g_return_if_fail (G_IS_FILE (child));
 691
 692   limiter = g_hash_table_lookup (monitor->priv->rate_limiter, child);
 693
 694   if (event_type != G_FILE_MONITOR_EVENT_CHANGED)
 695     {
 696       if (limiter)
 697         {
 698           rate_limiter_send_delayed_change_now (monitor, limiter, get_time_msecs ());
 699           if (event_type == G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT)
 700             limiter->send_virtual_changes_done_at = 0;
 701           else
 702             rate_limiter_send_virtual_changes_done_now (monitor, limiter);
 703           update_rate_limiter_timeout (monitor, 0);
 704         }
 705       emit_in_idle (monitor, child, other_file, event_type);
 706     }
 707   else
 708     {
 709       /* Changed event, rate limit */
 710       time_now = get_time_msecs ();
 711       emit_now = TRUE;
 712
 713       if (limiter)
 714         {
 715           since_last = time_difference (limiter->last_sent_change_time, time_now);
 716           if (since_last < monitor->priv->rate_limit_msec)
 717             {
 718               /* We ignore this change, but arm a timer so that we can fire it later if we
 719                  don't get any other events (that kill this timeout) */
 720               emit_now = FALSE;
 721               if (limiter->send_delayed_change_at == 0)
 722                 {
 723                   limiter->send_delayed_change_at = time_now + monitor->priv->rate_limit_msec;
 724                   update_rate_limiter_timeout (monitor, limiter->send_delayed_change_at);
 725                 }
 726             }
 727         }
 728
 729       if (limiter == NULL)
 730         limiter = new_limiter (monitor, child);
 731
 732       if (emit_now)
 733         {
 734           emit_in_idle (monitor, child, other_file, event_type);
 735
 736           limiter->last_sent_change_time = time_now;
 737           limiter->send_delayed_change_at = 0;
 738           /* Set a timeout of 2*rate limit so that we can clear out the change from the hash eventually */
 739           update_rate_limiter_timeout (monitor, time_now + 2 * monitor->priv->rate_limit_msec);
 740         }
 741
 742       /* Schedule a virtual change done. This is removed if we get a real one, and
 743          postponed if we get more change events. */
 744
 745       limiter->send_virtual_changes_done_at = time_now + DEFAULT_VIRTUAL_CHANGES_DONE_DELAY_SECS * 1000;
 746       update_rate_limiter_timeout (monitor, limiter->send_virtual_changes_done_at);
 747     }
 748 }