commoncpp/misc.h

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// Copyright (C) 2001-2005 Open Source Telecom Corporation.
// Copyright (C) 2006-2014 David Sugar, Tycho Softworks.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// This exception applies only to the code released under the name GNU
// Common C++.  If you copy code from other releases into a copy of GNU
// Common C++, as the General Public License permits, the exception does
// not apply to the code that you add in this way.  To avoid misleading
// anyone as to the status of such modified files, you must delete
// this exception notice from them.
//
// If you write modifications of your own for GNU Common C++, it is your choice
// whether to permit this exception to apply to your modifications.
// If you do not wish that, delete this exception notice.
//

#ifndef COMMONCPP_MISC_H_
#define COMMONCPP_MISC_H_

#ifndef COMMONCPP_CONFIG_H_
#include <commoncpp/config.h>
#endif

#define KEYDATA_INDEX_SIZE  97
#define KEYDATA_PAGER_SIZE  512
#if defined(PATH_MAX)
#if PATH_MAX > 512
#define KEYDATA_PATH_SIZE   512
#else
#define KEYDATA_PATH_SIZE   PATH_MAX
#endif
#else
#define KEYDATA_PATH_SIZE   256
#endif

NAMESPACE_COMMONCPP

class __EXPORT MemPager : private ucommon::memalloc
{
public:
    inline MemPager(size_t pagesize = 4096) : ucommon::memalloc(pagesize) {};

    inline void *alloc(size_t size)
        {return _alloc(size);}

    char *alloc(const char *str);

    inline char *first(const char *str)
        {return alloc(str);}

    inline void *first(size_t size)
        {return _alloc(size);}

    inline int getPages(void)
        {return pages();}

    inline void purge(void)
        {memalloc::purge();}
};

class __EXPORT SharedMemPager : public MemPager, public Mutex
{
protected:
    SharedMemPager(size_t pagesize = 4096);
    void purge(void);

    void* alloc(size_t size);

    inline void *first(size_t size)
        {return alloc(size);}
};


class __EXPORT Assoc
{
private:
    struct entry {
        const char *id;
        entry *next;
        void *data;
    };

    entry *entries[KEYDATA_INDEX_SIZE];

protected:
    Assoc();
    virtual ~Assoc();

    void clear(void);

    virtual void *getMemory(size_t size) = 0;

public:
    void *getPointer(const char *id) const;
    void setPointer(const char *id, void *data);
};

END_NAMESPACE
#endif

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