/*
   (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.
*/

#include <config.h>

#include <errno.h>
#include <unistd.h>

#include <direct/build.h>
#include <direct/system.h>
#ifdef ANDROID_OS
#include <sys/syscall.h>
#endif
#if DIRECT_BUILD_GETTID && defined(HAVE_LINUX_UNISTD_H)
#include <linux/unistd.h>
#endif

__attribute__((no_instrument_function))
pid_t
direct_gettid( void )
{
     pid_t tid = -1;
#if DIRECT_BUILD_GETTID && defined(__NR_gettid) /* present on linux >= 2.4.20 */
     tid = syscall(__NR_gettid);
#endif
     if (tid < 0)
          tid = getpid();

     return tid;
}
//in kernel c-r4k.c, for purose of avoid mips virutal alias issue, kernel set shm alignment requirement to CPU cache line size.
//current this value size is 0x2000



#ifdef PAGESIZE_LOG

#define PAGESIZE (0x1<<PAGESIZE_LOG)
#if PAGESIZE > 0x2000
#define MS_SHM_CACHE_PAGE_SIZE PAGESIZE
#else
#define MS_SHM_CACHE_PAGE_SIZE 0x2000
#endif

#else
#define MS_SHM_CACHE_PAGE_SIZE 0x2000
#endif

long
direct_pagesize( void )
{
#if 0
     return sysconf( _SC_PAGESIZE );
#else
   
  return   MS_SHM_CACHE_PAGE_SIZE;
#endif
}

unsigned long
direct_page_align( unsigned long value )
{
#if 0
     unsigned long mask = sysconf( _SC_PAGESIZE ) - 1;
#else
    unsigned long mask = MS_SHM_CACHE_PAGE_SIZE - 1;

#endif

     return (value + mask) & ~mask;
}

