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