/*
   (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__OS__LINUX__GLIBC__WAITQUEUE_H__
#define __DIRECT__OS__LINUX__GLIBC__WAITQUEUE_H__

#include <pthread.h>

#include <direct/util.h>

#include "mutex.h"

/**********************************************************************************************************************/

typedef struct {
     pthread_cond_t      cond;
} DirectWaitQueue;

/**********************************************************************************************************************/

#define DIRECT_WAITQUEUE_INITIALIZER(name)            { PTHREAD_COND_INITIALIZER }

/**********************************************************************************************************************/

static inline DirectResult
direct_waitqueue_init( DirectWaitQueue *queue )
{
     if (pthread_cond_init( &queue->cond, NULL ))
          return errno2result( errno );

     return DR_OK;
}

static inline DirectResult
direct_waitqueue_wait( DirectWaitQueue *queue, DirectMutex *mutex )
{
     if (pthread_cond_wait( &queue->cond, &mutex->lock ))
          return errno2result( errno );

     return DR_OK;
}

static inline DirectResult
direct_waitqueue_wait_timeout( DirectWaitQueue *queue, DirectMutex *mutex, unsigned long micros )
{
     struct timeval  now;
     struct timespec timeout;
     long int        nano_seconds = micros * 1000;

     gettimeofday( &now, NULL );

     timeout.tv_sec  = now.tv_sec;
     timeout.tv_nsec = (now.tv_usec * 1000) + nano_seconds;

     timeout.tv_sec  += timeout.tv_nsec / 1000000000;
     timeout.tv_nsec %= 1000000000;

     if (pthread_cond_timedwait( &queue->cond, &mutex->lock, &timeout ) == ETIMEDOUT)
          return DR_TIMEOUT;

     return DR_OK;
}

static inline DirectResult
direct_waitqueue_signal( DirectWaitQueue *queue )
{
     if (pthread_cond_signal( &queue->cond ))
          return errno2result( errno );

     return DR_OK;
}

static inline DirectResult
direct_waitqueue_broadcast( DirectWaitQueue *queue )
{
     if (pthread_cond_broadcast( &queue->cond ))
          return errno2result( errno );

     return DR_OK;
}

static inline DirectResult
direct_waitqueue_deinit( DirectWaitQueue *queue )
{
     if (pthread_cond_destroy( &queue->cond ))
          return errno2result( errno );

     return DR_OK;
}

#endif