mirror of https://gitee.com/openkylin/glib2.0.git
157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 8 -*- */
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/* inotify-missing.c - GVFS Monitor based on inotify.
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Copyright (C) 2005 John McCutchan
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, see <http://www.gnu.org/licenses/>.
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Authors:
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John McCutchan <john@johnmccutchan.com>
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*/
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#include "config.h"
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#include <glib.h>
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#include "inotify-missing.h"
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#include "inotify-path.h"
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#include "glib-private.h"
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#define SCAN_MISSING_TIME 4 /* 1/4 Hz */
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static gboolean im_debug_enabled = FALSE;
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#define IM_W if (im_debug_enabled) g_warning
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/* We put inotify_sub's that are missing on this list */
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static GList *missing_sub_list = NULL;
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static gboolean im_scan_missing (gpointer user_data);
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static gboolean scan_missing_running = FALSE;
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static void (*missing_cb)(inotify_sub *sub) = NULL;
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G_LOCK_EXTERN (inotify_lock);
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/* inotify_lock must be held before calling */
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void
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_im_startup (void (*callback)(inotify_sub *sub))
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{
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static gboolean initialized = FALSE;
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if (!initialized)
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{
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missing_cb = callback;
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initialized = TRUE;
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}
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}
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/* inotify_lock must be held before calling */
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void
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_im_add (inotify_sub *sub)
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{
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if (g_list_find (missing_sub_list, sub))
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{
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IM_W ("asked to add %s to missing list but it's already on the list!\n", sub->dirname);
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return;
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}
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IM_W ("adding %s to missing list\n", sub->dirname);
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missing_sub_list = g_list_prepend (missing_sub_list, sub);
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/* If the timeout is turned off, we turn it back on */
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if (!scan_missing_running)
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{
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GSource *source;
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scan_missing_running = TRUE;
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source = g_timeout_source_new_seconds (SCAN_MISSING_TIME);
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g_source_set_callback (source, im_scan_missing, NULL, NULL);
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g_source_attach (source, GLIB_PRIVATE_CALL (g_get_worker_context) ());
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g_source_unref (source);
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}
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}
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/* inotify_lock must be held before calling */
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void
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_im_rm (inotify_sub *sub)
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{
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GList *link;
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link = g_list_find (missing_sub_list, sub);
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if (!link)
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{
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IM_W ("asked to remove %s from missing list but it isn't on the list!\n", sub->dirname);
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return;
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}
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IM_W ("removing %s from missing list\n", sub->dirname);
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missing_sub_list = g_list_remove_link (missing_sub_list, link);
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g_list_free_1 (link);
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}
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/* Scans the list of missing subscriptions checking if they
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* are available yet.
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*/
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static gboolean
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im_scan_missing (gpointer user_data)
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{
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GList *nolonger_missing = NULL;
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GList *l;
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G_LOCK (inotify_lock);
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IM_W ("scanning missing list with %d items\n", g_list_length (missing_sub_list));
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for (l = missing_sub_list; l; l = l->next)
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{
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inotify_sub *sub = l->data;
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gboolean not_m = FALSE;
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IM_W ("checking %p\n", sub);
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g_assert (sub);
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g_assert (sub->dirname);
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not_m = _ip_start_watching (sub);
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if (not_m)
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{
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missing_cb (sub);
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IM_W ("removed %s from missing list\n", sub->dirname);
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/* We have to build a list of list nodes to remove from the
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* missing_sub_list. We do the removal outside of this loop.
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*/
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nolonger_missing = g_list_prepend (nolonger_missing, l);
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}
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}
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for (l = nolonger_missing; l ; l = l->next)
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{
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GList *llink = l->data;
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missing_sub_list = g_list_remove_link (missing_sub_list, llink);
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g_list_free_1 (llink);
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}
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g_list_free (nolonger_missing);
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/* If the missing list is now empty, we disable the timeout */
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if (missing_sub_list == NULL)
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{
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scan_missing_running = FALSE;
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G_UNLOCK (inotify_lock);
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return FALSE;
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}
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else
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{
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G_UNLOCK (inotify_lock);
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return TRUE;
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}
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}
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