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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 8 -*- */
/* inotify-missing.c - GVFS Monitor based on inotify.
Copyright (C) 2005 John McCutchan
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, see <http://www.gnu.org/licenses/>.
Authors:
John McCutchan <john@johnmccutchan.com>
*/
#include "config.h"
#include <glib.h>
#include "inotify-missing.h"
#include "inotify-path.h"
#include "glib-private.h"
#define SCAN_MISSING_TIME 4 /* 1/4 Hz */
static gboolean im_debug_enabled = FALSE;
#define IM_W if (im_debug_enabled) g_warning
/* We put inotify_sub'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)(inotify_sub *sub) = NULL;
G_LOCK_EXTERN (inotify_lock);
/* inotify_lock must be held before calling */
void
_im_startup (void (*callback)(inotify_sub *sub))
{
static gboolean initialized = FALSE;
if (!initialized)
{
missing_cb = callback;
initialized = TRUE;
}
}
/* inotify_lock must be held before calling */
void
_im_add (inotify_sub *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->dirname);
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)
{
GSource *source;
scan_missing_running = TRUE;
source = g_timeout_source_new_seconds (SCAN_MISSING_TIME);
g_source_set_callback (source, im_scan_missing, NULL, NULL);
g_source_attach (source, GLIB_PRIVATE_CALL (g_get_worker_context) ());
g_source_unref (source);
}
}
/* inotify_lock must be held before calling */
void
_im_rm (inotify_sub *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->dirname);
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)
{
inotify_sub *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;
}
}
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