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/*
(c) Copyright 2012-2013 DirectFB integrated media GmbH
(c) Copyright 2001-2013 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 Shimokawa <andi@directfb.org>,
Marek Pikarski <mass@directfb.org>,
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.
*/
//#define DIRECT_ENABLE_DEBUG
#include <config.h>
#include <direct/atomic.h>
#include <direct/debug.h>
#include <direct/serial.h>
#include <direct/system.h>
#include <direct/util.h>
D_LOG_DOMAIN( Direct_Serial_Notify, "Direct/Serial/Notify", "Direct Serial Notify" );
D_LOG_DOMAIN( Direct_Serial_Wait, "Direct/Serial/Wait", "Direct Serial Wait" );
/**********************************************************************************************************************/
DirectResult
direct_serial_wait( DirectSerial *serial,
const DirectSerial *source )
{
DirectResult ret = DR_OK;
D_ASSERT( serial != NULL );
D_ASSERT( source != NULL );
D_DEBUG_AT( Direct_Serial_Wait, " ## ## ## %s( %p, %p ) ## ## %lu ## %lu ## ## ## ##\n", __FUNCTION__,
serial, source, serial->value, source->value );
D_MAGIC_ASSERT( serial, DirectSerial );
D_MAGIC_ASSERT( source, DirectSerial );
D_SYNC_ADD( &serial->waiting, 1 );
do {
int wakeup = serial->wakeup;
D_ASSERT( serial->overflow == source->overflow || serial->value != source->value );
if (direct_serial_check( serial, source ))
break;
ret = direct_futex_wait( &serial->wakeup, wakeup );
} while (ret == DR_OK);
D_SYNC_ADD( &serial->waiting, -1 );
return ret;
}
DirectResult
direct_serial_notify( DirectSerial *serial, const DirectSerial *source )
{
D_ASSERT( serial != NULL );
D_ASSERT( source != NULL );
D_DEBUG_AT( Direct_Serial_Notify, " ###### %s( %p, %p ) ### %lu <-= %lu ### ### ###\n", __FUNCTION__,
serial, source, serial->value, source->value );
D_MAGIC_ASSERT( serial, DirectSerial );
D_MAGIC_ASSERT( source, DirectSerial );
D_ASSERT( serial->overflow <= source->overflow );
D_ASSERT( serial->overflow == source->overflow || serial->value != source->value );
if (serial->overflow < source->overflow) {
serial->overflow = source->overflow;
serial->value = source->value;
}
else if (serial->overflow == source->overflow && serial->value < source->value)
serial->value = source->value;
else {
D_ASSUME( serial->value == source->value );
return DR_OK;
}
if (serial->waiting > 0) {
D_SYNC_ADD( &serial->wakeup, 1 );
return direct_futex_wake( &serial->wakeup, 1024 );
}
return DR_OK;
}
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