XrdOssMio.hh

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#ifndef __XRDOSSMIO_H__
#define __XRDOSSMIO_H__
/******************************************************************************/
/*                                                                            */
/*                          X r d o s s M i o . h h                           */
/*                                                                            */
/* (c) 2005 by the Board of Trustees of the Leland Stanford, Jr., University  */
/*                            All Rights Reserved                             */
/*   Produced by Andrew Hanushevsky for Stanford University under contract    */
/*              DE-AC02-76-SFO0515 with the Department of Energy              */
/*                                                                            */
/* This file is part of the XRootD software suite.                            */
/*                                                                            */
/* XRootD 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 3 of the License, or (at your     */
/* option) any later version.                                                 */
/*                                                                            */
/* XRootD 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 XRootD in a file called COPYING.LESSER (LGPL license) and file  */
/* COPYING (GPL license).  If not, see <http://www.gnu.org/licenses/>.        */
/*                                                                            */
/* The copyright holder's institutional names and contributor's names may not */
/* be used to endorse or promote products derived from this software without  */
/* specific prior written permission of the institution or contributor.       */
/******************************************************************************/

#include "XrdSys/XrdSysError.hh"
#include "XrdOuc/XrdOucHash.hh"
#include "XrdSys/XrdSysPthread.hh"
#include "XrdOss/XrdOssMioFile.hh"

// The following are options passed to Map()
//
#define OSSMIO_MLOK 0x0001
#define OSSMIO_MMAP 0x0002
#define OSSMIO_MPRM 0x0004
  
class XrdOssMio
{
public:
static void           Display(XrdSysError &Eroute);

static char           isAuto() {return MM_chk;}

static char           isOn()   {return MM_on;}

static XrdOssMioFile *Map(char *path, int fd, int opts);

static void          *preLoad(void *arg);

static void           Recycle(XrdOssMioFile *mp);

static void           Set(int V_off, int V_preld, int V_check);

static void           Set(long long V_max);

private:
static int  Reclaim(off_t amount);
static int  Reclaim(XrdOssMioFile *mp);

static XrdOucHash<XrdOssMioFile> MM_Hash;

static XrdSysMutex    MM_Mutex;
static XrdOssMioFile *MM_Perm;
static XrdOssMioFile *MM_Idle;
static XrdOssMioFile *MM_IdleLast;

static char       MM_on;
static char       MM_chk;
static char       MM_okmlock;
static char       MM_preld;
static long long  MM_max;
static long long  MM_pagsz;
static long long  MM_pages;
static long long  MM_inuse;
};
#endif