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