1 files changed, 118 insertions, 0 deletions
diff --git a/Source/DirectFB/lib/direct/serial.h b/Source/DirectFB/lib/direct/serial.h
new file mode 100755
index 0000000..d201708
--- /dev/null
+++ b/Source/DirectFB/lib/direct/serial.h
@@ -0,0 +1,118 @@
+/*
+   (c) Copyright 2001-2009  The world wide DirectFB Open Source Community (directfb.org)
+   (c) Copyright 2000-2004  Convergence (integrated media) GmbH
+
+   All rights reserved.
+
+   Written by Denis Oliver Kropp <dok@directfb.org>,
+              Andreas Hundt <andi@fischlustig.de>,
+              Sven Neumann <neo@directfb.org>,
+              Ville Syrjälä <syrjala@sci.fi> and
+              Claudio Ciccani <klan@users.sf.net>.
+
+   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 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.
+*/
+
+#ifndef __DIRECT__SERIAL_H__
+#define __DIRECT__SERIAL_H__
+
+#include <direct/types.h>
+#include <direct/debug.h>
+
+struct __D_DirectSerial {
+     int   magic;
+
+     u32 value;
+     u32 overflow;
+};
+
+static __inline__ void
+direct_serial_init( DirectSerial *serial )
+{
+     D_ASSERT( serial != NULL );
+
+     serial->value    = 0;
+     serial->overflow = 0;
+
+     D_MAGIC_SET( serial, DirectSerial );
+}
+
+static __inline__ void
+direct_serial_deinit( DirectSerial *serial )
+{
+     D_MAGIC_CLEAR( serial );
+}
+
+static __inline__ void
+direct_serial_increase( DirectSerial *serial )
+{
+     D_MAGIC_ASSERT( serial, DirectSerial );
+
+     if (! ++serial->value)
+          serial->overflow++;
+}
+
+static __inline__ void
+direct_serial_copy( DirectSerial *serial, const DirectSerial *source )
+{
+     D_MAGIC_ASSERT( serial, DirectSerial );
+     D_MAGIC_ASSERT( source, DirectSerial );
+
+     serial->value    = source->value;
+     serial->overflow = source->overflow;
+}
+
+static __inline__ bool
+direct_serial_check( DirectSerial *serial, const DirectSerial *source )
+{
+     D_MAGIC_ASSERT( serial, DirectSerial );
+     D_MAGIC_ASSERT( source, DirectSerial );
+
+     if (serial->overflow < source->overflow)
+          return false;
+     else if (serial->overflow == source->overflow && serial->value < source->value)
+          return false;
+
+     D_ASSUME( serial->value == source->value );
+
+     return true;
+}
+
+static __inline__ bool
+direct_serial_update( DirectSerial *serial, const DirectSerial *source )
+{
+     D_MAGIC_ASSERT( serial, DirectSerial );
+     D_MAGIC_ASSERT( source, DirectSerial );
+
+     if (serial->overflow < source->overflow) {
+          serial->overflow = source->overflow;
+          serial->value    = source->value;
+
+          return true;
+     }
+     else if (serial->overflow == source->overflow && serial->value < source->value) {
+          serial->value = source->value;
+
+          return true;
+     }
+
+     D_ASSUME( serial->value == source->value );
+
+     return false;
+}
+
+#endif
+