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/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
Copyright (C) 2009-2015 Red Hat, Inc.
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/>.
*/
#include <config.h>
#include <cerrno>
#include <cstring>
#include <pthread.h>
#include <unistd.h>
#include "red-common.h"
#include "dispatcher.h"
#include "main-dispatcher.h"
#include "red-client.h"
#include "reds.h"
/*
* Main Dispatcher
* ===============
*
* Communication channel between any non main thread and the main thread.
*
* The main thread is that from which spice_server_init is called.
*
* Messages are single sized, sent from the non-main thread to the main-thread.
* No acknowledge is sent back. This prevents a possible deadlock with the main
* thread already waiting on a response for the existing red_dispatcher used
* by the worker thread.
*
* All events have three functions:
* main_dispatcher_<event_name> - non static, public function
* main_dispatcher_self_<event_name> - handler for main thread
* main_dispatcher_handle_<event_name> - handler for callback from main thread
* seperate from self because it may send an ack or do other work in the future.
*/
enum {
MAIN_DISPATCHER_CHANNEL_EVENT = 0,
MAIN_DISPATCHER_MIGRATE_SEAMLESS_DST_COMPLETE,
MAIN_DISPATCHER_CLIENT_DISCONNECT,
MAIN_DISPATCHER_NUM_MESSAGES
};
struct MainDispatcherChannelEventMessage {
int event;
SpiceChannelEventInfo *info;
};
struct MainDispatcherMigrateSeamlessDstCompleteMessage {
RedClient *client;
};
struct MainDispatcherClientDisconnectMessage {
RedClient *client;
};
/* channel_event - calls core->channel_event, must be done in main thread */
static void main_dispatcher_handle_channel_event(void *opaque,
void *payload)
{
auto reds = static_cast<RedsState *>(opaque);
auto channel_event = static_cast<MainDispatcherChannelEventMessage *>(payload);
reds_handle_channel_event(reds, channel_event->event, channel_event->info);
}
void MainDispatcher::channel_event(int event, SpiceChannelEventInfo *info)
{
MainDispatcherChannelEventMessage msg = {0,};
if (pthread_self() == thread_id) {
reds_handle_channel_event(reds, event, info);
return;
}
msg.event = event;
msg.info = info;
send_message(MAIN_DISPATCHER_CHANNEL_EVENT, &msg);
}
static void main_dispatcher_handle_migrate_complete(void *opaque,
void *payload)
{
auto reds = static_cast<RedsState *>(opaque);
auto mig_complete = static_cast<MainDispatcherMigrateSeamlessDstCompleteMessage *>(payload);
reds_on_client_seamless_migrate_complete(reds, mig_complete->client);
mig_complete->client->unref();
}
static void main_dispatcher_handle_client_disconnect(void *opaque,
void *payload)
{
auto reds = static_cast<RedsState *>(opaque);
auto msg = static_cast<MainDispatcherClientDisconnectMessage *>(payload);
spice_debug("client=%p", msg->client);
reds_client_disconnect(reds, msg->client);
msg->client->unref();
}
void MainDispatcher::seamless_migrate_dst_complete(RedClient *client)
{
MainDispatcherMigrateSeamlessDstCompleteMessage msg;
if (pthread_self() == thread_id) {
reds_on_client_seamless_migrate_complete(reds, client);
return;
}
msg.client = red::add_ref(client);
send_message(MAIN_DISPATCHER_MIGRATE_SEAMLESS_DST_COMPLETE, &msg);
}
void MainDispatcher::client_disconnect(RedClient *client)
{
MainDispatcherClientDisconnectMessage msg;
if (!client->is_disconnecting()) {
spice_debug("client %p", client);
msg.client = red::add_ref(client);
send_message(MAIN_DISPATCHER_CLIENT_DISCONNECT, &msg);
} else {
spice_debug("client %p already during disconnection", client);
}
}
/*
* FIXME:
* Reds routines shouldn't be exposed. Instead reds.cpp should register the callbacks,
* and the corresponding operations should be made only via main_dispatcher.
*/
MainDispatcher::MainDispatcher(RedsState *init_reds):
Dispatcher(MAIN_DISPATCHER_NUM_MESSAGES),
reds(init_reds),
thread_id(pthread_self())
{
set_opaque(reds);
watch = create_watch(reds_get_core_interface(reds));
register_handler(MAIN_DISPATCHER_CHANNEL_EVENT,
main_dispatcher_handle_channel_event,
sizeof(MainDispatcherChannelEventMessage), false);
register_handler(MAIN_DISPATCHER_MIGRATE_SEAMLESS_DST_COMPLETE,
main_dispatcher_handle_migrate_complete,
sizeof(MainDispatcherMigrateSeamlessDstCompleteMessage), false);
register_handler(MAIN_DISPATCHER_CLIENT_DISCONNECT,
main_dispatcher_handle_client_disconnect,
sizeof(MainDispatcherClientDisconnectMessage), false);
}
MainDispatcher::~MainDispatcher()
{
red_watch_remove(watch);
}
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