cpl_virtualmem.h

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/**********************************************************************
 * $Id: cpl_virtualmem.h 36485 2016-11-24 07:54:20Z goatbar $
 *
 * Name:     cpl_virtualmem.h
 * Project:  CPL - Common Portability Library
 * Purpose:  Virtual memory
 * Author:   Even Rouault, <even dot rouault at mines dash paris dot org>
 *
 **********************************************************************
 * Copyright (c) 2014, Even Rouault <even dot rouault at mines-paris dot org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#ifndef CPL_VIRTUAL_MEM_INCLUDED
#define CPL_VIRTUAL_MEM_INCLUDED

#include <stddef.h>

#include "cpl_port.h"
#include "cpl_vsi.h"

CPL_C_START

typedef struct CPLVirtualMem CPLVirtualMem;

typedef void (*CPLVirtualMemCachePageCbk)(CPLVirtualMem* ctxt,
                                    size_t nOffset,
                                    void* pPageToFill,
                                    size_t nToFill,
                                    void* pUserData);

typedef void (*CPLVirtualMemUnCachePageCbk)(CPLVirtualMem* ctxt,
                                      size_t nOffset,
                                      const void* pPageToBeEvicted,
                                      size_t nToBeEvicted,
                                      void* pUserData);

typedef void (*CPLVirtualMemFreeUserData)(void* pUserData);

typedef enum
{
    VIRTUALMEM_READONLY,
    VIRTUALMEM_READONLY_ENFORCED,
    VIRTUALMEM_READWRITE
} CPLVirtualMemAccessMode;

size_t CPL_DLL CPLGetPageSize(void);

CPLVirtualMem CPL_DLL *CPLVirtualMemNew(size_t nSize,
                                        size_t nCacheSize,
                                        size_t nPageSizeHint,
                                        int bSingleThreadUsage,
                                        CPLVirtualMemAccessMode eAccessMode,
                                        CPLVirtualMemCachePageCbk pfnCachePage,
                                        CPLVirtualMemUnCachePageCbk pfnUnCachePage,
                                        CPLVirtualMemFreeUserData pfnFreeUserData,
                                        void *pCbkUserData);

int CPL_DLL CPLIsVirtualMemFileMapAvailable(void);

CPLVirtualMem CPL_DLL *CPLVirtualMemFileMapNew( VSILFILE* fp,
                                                vsi_l_offset nOffset,
                                                vsi_l_offset nLength,
                                                CPLVirtualMemAccessMode eAccessMode,
                                                CPLVirtualMemFreeUserData pfnFreeUserData,
                                                void *pCbkUserData );

CPLVirtualMem CPL_DLL *CPLVirtualMemDerivedNew(CPLVirtualMem* pVMemBase,
                                               vsi_l_offset nOffset,
                                               vsi_l_offset nSize,
                                               CPLVirtualMemFreeUserData pfnFreeUserData,
                                               void *pCbkUserData);

void CPL_DLL CPLVirtualMemFree(CPLVirtualMem* ctxt);

void CPL_DLL *CPLVirtualMemGetAddr(CPLVirtualMem* ctxt);

size_t CPL_DLL CPLVirtualMemGetSize(CPLVirtualMem* ctxt);

int CPL_DLL CPLVirtualMemIsFileMapping(CPLVirtualMem* ctxt);

CPLVirtualMemAccessMode CPL_DLL CPLVirtualMemGetAccessMode(CPLVirtualMem* ctxt);

size_t CPL_DLL CPLVirtualMemGetPageSize(CPLVirtualMem* ctxt);

int CPL_DLL CPLVirtualMemIsAccessThreadSafe(CPLVirtualMem* ctxt);

void CPL_DLL CPLVirtualMemDeclareThread(CPLVirtualMem* ctxt);

void CPL_DLL CPLVirtualMemUnDeclareThread(CPLVirtualMem* ctxt);

void CPL_DLL CPLVirtualMemPin(CPLVirtualMem* ctxt,
                              void* pAddr, size_t nSize, int bWriteOp);

void CPL_DLL CPLVirtualMemManagerTerminate(void);

CPL_C_END

#endif /* CPL_VIRTUAL_MEM_INCLUDED */