/usr/include/directfb/direct/serial.h is in libdirectfb-dev 1.2.10.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(c) Copyright 2001-2008 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
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