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/*
* valerie_notifier.c -- Unit Status Notifier Handling
* Copyright (C) 2002-2003 Ushodaya Enterprises Limited
* Author: Charles Yates <charles.yates@pandora.be>
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/* System header files */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/time.h>
/* Application header files */
#include "valerie_notifier.h"
/** Notifier initialisation.
*/
valerie_notifier valerie_notifier_init( )
{
valerie_notifier this = calloc( 1, sizeof( valerie_notifier_t ) );
if ( this != NULL )
{
int index = 0;
pthread_mutex_init( &this->mutex, NULL );
pthread_cond_init( &this->cond, NULL );
for ( index = 0; index < MAX_UNITS; index ++ )
this->store[ index ].unit = index;
}
return this;
}
/** Get a stored status for the specified unit.
*/
void valerie_notifier_get( valerie_notifier this, valerie_status status, int unit )
{
pthread_mutex_lock( &this->mutex );
if ( unit >= 0 && unit < MAX_UNITS )
valerie_status_copy( status, &this->store[ unit ] );
else
memset( status, 0, sizeof( valerie_status_t ) );
status->unit = unit;
status->dummy = time( NULL );
pthread_mutex_unlock( &this->mutex );
}
/** Wait on a new status.
*/
int valerie_notifier_wait( valerie_notifier this, valerie_status status )
{
struct timeval now;
struct timespec timeout;
int error = 0;
memset( status, 0, sizeof( valerie_status_t ) );
gettimeofday( &now, NULL );
timeout.tv_sec = now.tv_sec + 1;
timeout.tv_nsec = now.tv_usec * 1000;
pthread_mutex_lock( &this->mutex );
pthread_cond_timedwait( &this->cond, &this->mutex, &timeout );
valerie_status_copy( status, &this->last );
pthread_mutex_unlock( &this->mutex );
return error;
}
/** Put a new status.
*/
void valerie_notifier_put( valerie_notifier this, valerie_status status )
{
pthread_mutex_lock( &this->mutex );
valerie_status_copy( &this->store[ status->unit ], status );
valerie_status_copy( &this->last, status );
pthread_mutex_unlock( &this->mutex );
pthread_cond_broadcast( &this->cond );
}
/** Communicate a disconnected status for all units to all waiting.
*/
void valerie_notifier_disconnected( valerie_notifier notifier )
{
int unit = 0;
valerie_status_t status;
for ( unit = 0; unit < MAX_UNITS; unit ++ )
{
valerie_notifier_get( notifier, &status, unit );
status.status = unit_disconnected;
valerie_notifier_put( notifier, &status );
}
}
/** Close the notifier - note that all access must be stopped before we call this.
*/
void valerie_notifier_close( valerie_notifier this )
{
if ( this != NULL )
{
pthread_mutex_destroy( &this->mutex );
pthread_cond_destroy( &this->cond );
free( this );
}
}
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