2 * valerie_notifier.c -- Unit Status Notifier Handling
3 * Copyright (C) 2002-2003 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 /* System header files */
32 /* Application header files */
33 #include "valerie_notifier.h"
35 /** Notifier initialisation.
38 valerie_notifier
valerie_notifier_init( )
40 valerie_notifier
this = calloc( 1, sizeof( valerie_notifier_t
) );
44 pthread_mutex_init( &this->mutex
, NULL
);
45 pthread_cond_init( &this->cond
, NULL
);
46 for ( index
= 0; index
< MAX_UNITS
; index
++ )
47 this->store
[ index
].unit
= index
;
52 /** Get a stored status for the specified unit.
55 void valerie_notifier_get( valerie_notifier
this, valerie_status status
, int unit
)
57 pthread_mutex_lock( &this->mutex
);
58 if ( unit
>= 0 && unit
< MAX_UNITS
)
59 valerie_status_copy( status
, &this->store
[ unit
] );
61 memset( status
, 0, sizeof( valerie_status_t
) );
63 status
->dummy
= time( NULL
);
64 pthread_mutex_unlock( &this->mutex
);
67 /** Wait on a new status.
70 int valerie_notifier_wait( valerie_notifier
this, valerie_status status
)
73 struct timespec timeout
;
76 memset( status
, 0, sizeof( valerie_status_t
) );
77 gettimeofday( &now
, NULL
);
78 timeout
.tv_sec
= now
.tv_sec
+ 1;
79 timeout
.tv_nsec
= now
.tv_usec
* 1000;
80 pthread_mutex_lock( &this->mutex
);
81 pthread_cond_timedwait( &this->cond
, &this->mutex
, &timeout
);
82 valerie_status_copy( status
, &this->last
);
83 pthread_mutex_unlock( &this->mutex
);
91 void valerie_notifier_put( valerie_notifier
this, valerie_status status
)
93 pthread_mutex_lock( &this->mutex
);
94 valerie_status_copy( &this->store
[ status
->unit
], status
);
95 valerie_status_copy( &this->last
, status
);
96 pthread_mutex_unlock( &this->mutex
);
97 pthread_cond_broadcast( &this->cond
);
100 /** Communicate a disconnected status for all units to all waiting.
103 void valerie_notifier_disconnected( valerie_notifier notifier
)
106 valerie_status_t status
;
107 for ( unit
= 0; unit
< MAX_UNITS
; unit
++ )
109 valerie_notifier_get( notifier
, &status
, unit
);
110 status
.status
= unit_disconnected
;
111 valerie_notifier_put( notifier
, &status
);
115 /** Close the notifier - note that all access must be stopped before we call this.
118 void valerie_notifier_close( valerie_notifier
this )
122 pthread_mutex_destroy( &this->mutex
);
123 pthread_cond_destroy( &this->cond
);