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/**
* @file sender.c
*
* @brief Implementation of sender_t.
*
*/
/*
* Copyright (C) 2005-2006 Martin Willi
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*/
#include <stdlib.h>
#include <pthread.h>
#include "sender.h"
#include <daemon.h>
#include <network/socket.h>
typedef struct private_sender_t private_sender_t;
/**
* Private data of a sender_t object.
*/
struct private_sender_t {
/**
* Public part of a sender_t object.
*/
sender_t public;
/**
* Assigned thread.
*/
pthread_t assigned_thread;
/**
* The packets are stored in a linked list
*/
linked_list_t *list;
/**
* mutex to synchronize access to list
*/
pthread_mutex_t mutex;
/**
* condvar to signal for packets in list
*/
pthread_cond_t condvar;
};
/**
* implements sender_t.send
*/
static void send_(private_sender_t *this, packet_t *packet)
{
host_t *src, *dst;
src = packet->get_source(packet);
dst = packet->get_destination(packet);
DBG1(DBG_NET, "sending packet: from %#H to %#H", src, dst);
pthread_mutex_lock(&this->mutex);
this->list->insert_last(this->list, packet);
pthread_mutex_unlock(&this->mutex);
pthread_cond_signal(&this->condvar);
}
/**
* Implementation of private_sender_t.send_packets.
*/
static void send_packets(private_sender_t * this)
{
/* cancellation disabled by default */
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
DBG1(DBG_NET, "sender thread running, thread_ID: %06u", (int)pthread_self());
charon->drop_capabilities(charon, TRUE);
while (TRUE)
{
packet_t *packet;
int oldstate;
pthread_mutex_lock(&this->mutex);
/* go to wait while no packets available */
while (this->list->get_count(this->list) == 0)
{
/* add cleanup handler, wait for packet, remove cleanup handler */
pthread_cleanup_push((void(*)(void*))pthread_mutex_unlock, (void*)&this->mutex);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldstate);
pthread_cond_wait(&this->condvar, &this->mutex);
pthread_setcancelstate(oldstate, NULL);
pthread_cleanup_pop(0);
}
this->list->remove_first(this->list, (void**)&packet);
pthread_mutex_unlock(&this->mutex);
charon->socket->send(charon->socket, packet);
packet->destroy(packet);
}
}
/**
* Implementation of sender_t.destroy.
*/
static void destroy(private_sender_t *this)
{
/* send all packets in the queue */
while (this->list->get_count(this->list))
{
sched_yield();
}
pthread_cancel(this->assigned_thread);
pthread_join(this->assigned_thread, NULL);
this->list->destroy(this->list);
free(this);
}
/*
* Described in header.
*/
sender_t * sender_create()
{
private_sender_t *this = malloc_thing(private_sender_t);
this->public.send = (void(*)(sender_t*,packet_t*))send_;
this->public.destroy = (void(*)(sender_t*)) destroy;
this->list = linked_list_create();
pthread_mutex_init(&this->mutex, NULL);
pthread_cond_init(&this->condvar, NULL);
if (pthread_create(&this->assigned_thread, NULL,
(void*)send_packets, this) != 0)
{
charon->kill(charon, "unable to create sender thread");
}
return &(this->public);
}
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