source: mainline/uspace/lib/gui/connection.c@ a35b458

/*
 * Copyright (c) 2012 Petr Koupy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup gui
 * @{
 */
/**
 * @file
 */

#include <mem.h>
#include <stdlib.h>
#include <adt/list.h>
#include <adt/prodcons.h>
#include <fibril_synch.h>
#include <io/window.h>

#include "window.h"
#include "widget.h"
#include "connection.h"

typedef struct {
        link_t link;
        widget_t *widget;
        slot_t slot;
} slot_node_t;

typedef struct {
        link_t link;
        signal_t *signal;
        list_t slots;
} signal_node_t;

static FIBRIL_RWLOCK_INITIALIZE(connection_guard);
static LIST_INITIALIZE(connection_list);

void sig_connect(signal_t *signal, widget_t *widget, slot_t slot)
{
        fibril_rwlock_write_lock(&connection_guard);

        signal_node_t *sig_node = NULL;
        list_foreach(connection_list, link, signal_node_t, cur) {
                if (cur->signal == signal) {
                        sig_node = cur;
                        break;
                }
        }

        if (!sig_node) {
                sig_node = (signal_node_t *) malloc(sizeof(signal_node_t));
                if (!sig_node) {
                        fibril_rwlock_write_unlock(&connection_guard);
                        return;
                }

                sig_node->signal = signal;
                link_initialize(&sig_node->link);
                list_initialize(&sig_node->slots);

                list_append(&sig_node->link, &connection_list);
        }

        slot_node_t *slt_node = NULL;
        list_foreach(sig_node->slots, link, slot_node_t, cur) {
                if (cur->widget == widget && cur->slot == slot) {
                        slt_node = cur;
                        fibril_rwlock_write_unlock(&connection_guard);
                        break;
                }
        }

        if (!slt_node) {
                slt_node = (slot_node_t *) malloc(sizeof(slot_node_t));
                if (!slt_node) {
                        fibril_rwlock_write_unlock(&connection_guard);
                        return;
                }

                slt_node->widget = widget;
                slt_node->slot = slot;
                link_initialize(&slt_node->link);

                list_append(&slt_node->link, &sig_node->slots);
        } else {
                /* Already connected. */
        }

        fibril_rwlock_write_unlock(&connection_guard);
}

void sig_disconnect(signal_t *signal, widget_t *widget, slot_t slot)
{
        fibril_rwlock_write_lock(&connection_guard);

        signal_node_t *sig_node = NULL;
        list_foreach(connection_list, link, signal_node_t, cur) {
                if (cur->signal == signal) {
                        sig_node = cur;
                        break;
                }
        }

        if (!sig_node) {
                fibril_rwlock_write_unlock(&connection_guard);
                return;
        }

        slot_node_t *slt_node = NULL;
        list_foreach(sig_node->slots, link, slot_node_t, cur) {
                if (cur->widget == widget && cur->slot == slot) {
                        slt_node = cur;
                        break;
                }
        }

        if (!slt_node) {
                fibril_rwlock_write_unlock(&connection_guard);
                return;
        }

        list_remove(&slt_node->link);
        free(slt_node);

        if (list_empty(&sig_node->slots)) {
                list_remove(&sig_node->link);
                free(sig_node);
        }

        fibril_rwlock_write_unlock(&connection_guard);
}

void sig_send(signal_t *signal, void *data)
{
        fibril_rwlock_read_lock(&connection_guard);

        signal_node_t *sig_node = NULL;
        list_foreach(connection_list, link, signal_node_t, cur) {
                if (cur->signal == signal) {
                        sig_node = cur;
                        break;
                }
        }

        if (!sig_node) {
                fibril_rwlock_read_unlock(&connection_guard);
                return;
        }

        list_foreach(sig_node->slots, link, slot_node_t, cur) {
                cur->slot(cur->widget, data);
        }

        fibril_rwlock_read_unlock(&connection_guard);
}

void sig_post(signal_t *signal, void *data, size_t data_size)
{
        fibril_rwlock_read_lock(&connection_guard);

        signal_node_t *sig_node = NULL;
        list_foreach(connection_list, link, signal_node_t, cur) {
                if (cur->signal == signal) {
                        sig_node = cur;
                        break;
                }
        }

        if (!sig_node) {
                fibril_rwlock_read_unlock(&connection_guard);
                return;
        }

        list_foreach(sig_node->slots, link, slot_node_t, cur) {
                void *data_copy = NULL;
                if (data != NULL)
                        data_copy = malloc(data_size);

                if (data_copy != NULL)
                        memcpy(data_copy, data, data_size);

                window_event_t *event =
                    (window_event_t *) malloc(sizeof(window_event_t));

                if (event) {
                        link_initialize(&event->link);
                        event->type = ET_SIGNAL_EVENT;
                        event->data.signal.object = (sysarg_t) cur->widget;
                        event->data.signal.slot = (sysarg_t) cur->slot;
                        event->data.signal.argument = (sysarg_t) data_copy;
                        prodcons_produce(&cur->widget->window->events, &event->link);
                } else {
                        if (data_copy != NULL)
                                free(data_copy);
                }
        }

        fibril_rwlock_read_unlock(&connection_guard);
}

/** @}
 */