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inotify-missing.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */

/* inotify-helper.c - Gnome VFS Monitor based on inotify.

   Copyright (C) 2005 John McCutchan

   The Gnome Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The Gnome Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the Gnome Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.

   Authors: 
             John McCutchan <john@johnmccutchan.com>
*/

#include "config.h"
#include <glib.h>
#include "inotify-missing.h"
#include "inotify-path.h"

#define SCAN_MISSING_TIME 4000 /* 1/4 Hz */

static gboolean     im_debug_enabled = FALSE;
#define IM_W if (im_debug_enabled) g_warning

/* We put ih_sub_t's that are missing on this list */
static GList *missing_sub_list = NULL;
static gboolean im_scan_missing (gpointer user_data);
static gboolean scan_missing_running = FALSE;
static void (*missing_cb)(ih_sub_t *sub) = NULL;

G_LOCK_EXTERN (inotify_lock);

/* inotify_lock must be held before calling */
void im_startup (void (*callback)(ih_sub_t *sub))
{
      static gboolean initialized = FALSE;

      if (!initialized) {
            initialized = TRUE;
            missing_cb = callback;
      }
}

/* inotify_lock must be held before calling */
void im_add (ih_sub_t *sub)
{
      if (g_list_find (missing_sub_list, sub)) {
            IM_W("asked to add %s to missing list but it's already on the list!\n", sub->pathname);
            return;
      }

      IM_W("adding %s to missing list\n", sub->dirname);
      missing_sub_list = g_list_prepend (missing_sub_list, sub);

      /* If the timeout is turned off, we turn it back on */
      if (!scan_missing_running)
      {
            scan_missing_running = TRUE;
            g_timeout_add (SCAN_MISSING_TIME, im_scan_missing, NULL);
      }
}

/* inotify_lock must be held before calling */
void im_rm (ih_sub_t *sub)
{
      GList *link;

      link = g_list_find (missing_sub_list, sub);

      if (!link) {
            IM_W("asked to remove %s from missing list but it isn't on the list!\n", sub->pathname);
            return;
      }

      IM_W("removing %s from missing list\n", sub->dirname);

      missing_sub_list = g_list_remove_link (missing_sub_list, link);
      g_list_free_1 (link);
}

/* Scans the list of missing subscriptions checking if they
 * are available yet.
 */
static gboolean im_scan_missing (gpointer user_data)
{
      GList *nolonger_missing = NULL;
      GList *l;

      G_LOCK(inotify_lock);

      IM_W("scanning missing list with %d items\n", g_list_length (missing_sub_list));
      for (l = missing_sub_list; l; l = l->next)
      {
            ih_sub_t *sub = l->data;
            gboolean not_m = FALSE;

            IM_W("checking %p\n", sub);
            g_assert (sub);
            g_assert (sub->dirname);
            not_m = ip_start_watching (sub);

            if (not_m)
            {
                  missing_cb (sub);
                  IM_W("removed %s from missing list\n", sub->dirname);
                  /* We have to build a list of list nodes to remove from the
                  * missing_sub_list. We do the removal outside of this loop.
                  */
                  nolonger_missing = g_list_prepend (nolonger_missing, l);
            } 
      }

      for (l = nolonger_missing; l ; l = l->next)
      {
            GList *llink = l->data;
            missing_sub_list = g_list_remove_link (missing_sub_list, llink);
            g_list_free_1 (llink);
      }

      g_list_free (nolonger_missing);

      /* If the missing list is now empty, we disable the timeout */
      if (missing_sub_list == NULL)
      {
            scan_missing_running = FALSE;
            G_UNLOCK(inotify_lock);
            return FALSE;
      } else {
            G_UNLOCK(inotify_lock);
            return TRUE;
      }
}


/* inotify_lock must be held */
void
im_diag_dump (GIOChannel *ioc)
{
      GList *l;
      g_io_channel_write_chars (ioc, "missing list:\n", -1, NULL, NULL);
      for (l = missing_sub_list; l; l = l->next)
      {
            ih_sub_t *sub = l->data;
            g_io_channel_write_chars (ioc, sub->pathname, -1, NULL, NULL);
            g_io_channel_write_chars (ioc, "\n", -1, NULL, NULL);
      }
}

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