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127 lines
3.4 KiB
127 lines
3.4 KiB
/*
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* valerie_notifier.c -- Unit Status Notifier Handling
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* Copyright (C) 2002-2003 Ushodaya Enterprises Limited
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* Author: Charles Yates <charles.yates@pandora.be>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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/* System header files */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/time.h>
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/* Application header files */
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#include "valerie_notifier.h"
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/** Notifier initialisation.
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*/
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valerie_notifier valerie_notifier_init( )
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{
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valerie_notifier this = calloc( 1, sizeof( valerie_notifier_t ) );
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if ( this != NULL )
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{
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int index = 0;
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pthread_mutex_init( &this->mutex, NULL );
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pthread_cond_init( &this->cond, NULL );
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for ( index = 0; index < MAX_UNITS; index ++ )
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this->store[ index ].unit = index;
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}
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return this;
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}
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/** Get a stored status for the specified unit.
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*/
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void valerie_notifier_get( valerie_notifier this, valerie_status status, int unit )
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{
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pthread_mutex_lock( &this->mutex );
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if ( unit >= 0 && unit < MAX_UNITS )
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valerie_status_copy( status, &this->store[ unit ] );
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else
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memset( status, 0, sizeof( valerie_status_t ) );
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status->unit = unit;
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status->dummy = time( NULL );
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pthread_mutex_unlock( &this->mutex );
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}
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/** Wait on a new status.
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*/
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int valerie_notifier_wait( valerie_notifier this, valerie_status status )
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{
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struct timeval now;
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struct timespec timeout;
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int error = 0;
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memset( status, 0, sizeof( valerie_status_t ) );
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gettimeofday( &now, NULL );
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timeout.tv_sec = now.tv_sec + 1;
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timeout.tv_nsec = now.tv_usec * 1000;
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pthread_mutex_lock( &this->mutex );
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pthread_cond_timedwait( &this->cond, &this->mutex, &timeout );
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valerie_status_copy( status, &this->last );
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pthread_mutex_unlock( &this->mutex );
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return error;
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}
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/** Put a new status.
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*/
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void valerie_notifier_put( valerie_notifier this, valerie_status status )
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{
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pthread_mutex_lock( &this->mutex );
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valerie_status_copy( &this->store[ status->unit ], status );
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valerie_status_copy( &this->last, status );
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pthread_mutex_unlock( &this->mutex );
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pthread_cond_broadcast( &this->cond );
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}
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/** Communicate a disconnected status for all units to all waiting.
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*/
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void valerie_notifier_disconnected( valerie_notifier notifier )
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{
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int unit = 0;
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valerie_status_t status;
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for ( unit = 0; unit < MAX_UNITS; unit ++ )
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{
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valerie_notifier_get( notifier, &status, unit );
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status.status = unit_disconnected;
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valerie_notifier_put( notifier, &status );
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}
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}
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/** Close the notifier - note that all access must be stopped before we call this.
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*/
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void valerie_notifier_close( valerie_notifier this )
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{
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if ( this != NULL )
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{
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pthread_mutex_destroy( &this->mutex );
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pthread_cond_destroy( &this->cond );
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free( this );
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}
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}
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