Rename miracle, valerie, humperdink, and albino.

[melted] / src / mvcp / mvcp_notifier.c

diff --git a/src/mvcp/mvcp_notifier.c b/src/mvcp/mvcp_notifier.c
new file mode 100644 (file)
index 0000000..5e34043
--- /dev/null
+++ b/src/mvcp/mvcp_notifier.c
@@ -0,0 +1,126 @@
+/*
+ * 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 );
+       }
+}