mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-22 22:41:30 +03:00
138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/*
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* Copyright 2006-2007 Daniel Silverstone <dsilvers@digital-scurf.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <glib.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include "utils/errors.h"
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#include "gtk/schedule.h"
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#ifdef DEBUG_GTK_SCHEDULE
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#include "utils/log.h"
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#else
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#define LOG(X)
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#endif
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/** Killable callback closure embodiment. */
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typedef struct {
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void (*callback)(void *); /**< The callback function. */
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void *context; /**< The context for the callback. */
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bool callback_killed; /**< Whether or not this was killed. */
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} _nsgtk_callback_t;
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/** List of callbacks which have occurred and are pending running. */
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static GList *pending_callbacks = NULL;
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/** List of callbacks which are queued to occur in the future. */
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static GList *queued_callbacks = NULL;
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/** List of callbacks which are about to be run in this ::schedule_run. */
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static GList *this_run = NULL;
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static gboolean
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nsgtk_schedule_generic_callback(gpointer data)
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{
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_nsgtk_callback_t *cb = (_nsgtk_callback_t *)(data);
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if (cb->callback_killed) {
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/* This callback instance has been killed. */
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LOG(("CB at %p already dead.", cb));
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}
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queued_callbacks = g_list_remove(queued_callbacks, cb);
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pending_callbacks = g_list_append(pending_callbacks, cb);
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return FALSE;
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}
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static void
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nsgtk_schedule_kill_callback(void *_target, void *_match)
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{
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_nsgtk_callback_t *target = (_nsgtk_callback_t *)_target;
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_nsgtk_callback_t *match = (_nsgtk_callback_t *)_match;
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if ((target->callback == match->callback) &&
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(target->context == match->context)) {
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LOG(("Found match for %p(%p), killing.",
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target->callback, target->context));
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target->callback = NULL;
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target->context = NULL;
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target->callback_killed = true;
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}
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}
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static void
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schedule_remove(void (*callback)(void *p), void *p)
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{
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_nsgtk_callback_t cb_match = {
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.callback = callback,
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.context = p,
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};
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g_list_foreach(queued_callbacks,
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nsgtk_schedule_kill_callback, &cb_match);
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g_list_foreach(pending_callbacks,
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nsgtk_schedule_kill_callback, &cb_match);
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g_list_foreach(this_run,
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nsgtk_schedule_kill_callback, &cb_match);
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}
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/* exported interface documented in gtk/schedule.h */
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nserror nsgtk_schedule(int t, void (*callback)(void *p), void *p)
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{
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_nsgtk_callback_t *cb;
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/* Kill any pending schedule of this kind. */
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schedule_remove(callback, p);
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if (t < 0) {
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return NSERROR_OK;
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}
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cb = malloc(sizeof(_nsgtk_callback_t));
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cb->callback = callback;
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cb->context = p;
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cb->callback_killed = false;
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/* Prepend is faster right now. */
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queued_callbacks = g_list_prepend(queued_callbacks, cb);
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g_timeout_add(t, nsgtk_schedule_generic_callback, cb);
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return NSERROR_OK;
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}
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bool
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schedule_run(void)
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{
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/* Capture this run of pending callbacks into the list. */
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this_run = pending_callbacks;
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if (this_run == NULL)
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return false; /* Nothing to do */
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/* Clear the pending list. */
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pending_callbacks = NULL;
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LOG(("Captured a run of %d callbacks to fire.", g_list_length(this_run)));
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/* Run all the callbacks which made it this far. */
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while (this_run != NULL) {
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_nsgtk_callback_t *cb = (_nsgtk_callback_t *)(this_run->data);
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this_run = g_list_remove(this_run, this_run->data);
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if (!cb->callback_killed)
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cb->callback(cb->context);
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free(cb);
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}
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return true;
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}
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