UCommon
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00001 // Copyright (C) 2001-2005 Open Source Telecom Corporation.
00002 // Copyright (C) 2006-2014 David Sugar, Tycho Softworks.
00003 // Copyright (C) 2015 Cherokees of Idaho.
00004 //
00005 // This program is free software; you can redistribute it and/or modify
00006 // it under the terms of the GNU General Public License as published by
00007 // the Free Software Foundation; either version 2 of the License, or
00008 // (at your option) any later version.
00009 //
00010 // This program is distributed in the hope that it will be useful,
00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013 // GNU General Public License for more details.
00014 //
00015 // You should have received a copy of the GNU Lesser General Public License
00016 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
00017 //
00018 // As a special exception, you may use this file as part of a free software
00019 // library without restriction.  Specifically, if other files instantiate
00020 // templates or use macros or inline functions from this file, or you compile
00021 // this file and link it with other files to produce an executable, this
00022 // file does not by itself cause the resulting executable to be covered by
00023 // the GNU General Public License.  This exception does not however
00024 // invalidate any other reasons why the executable file might be covered by
00025 // the GNU General Public License.
00026 //
00027 // This exception applies only to the code released under the name GNU
00028 // Common C++.  If you copy code from other releases into a copy of GNU
00029 // Common C++, as the General Public License permits, the exception does
00030 // not apply to the code that you add in this way.  To avoid misleading
00031 // anyone as to the status of such modified files, you must delete
00032 // this exception notice from them.
00033 //
00034 // If you write modifications of your own for GNU Common C++, it is your choice
00035 // whether to permit this exception to apply to your modifications.
00036 // If you do not wish that, delete this exception notice.
00037 //
00038 
00044 #ifndef COMMONCPP_MISC_H_
00045 #define COMMONCPP_MISC_H_
00046 
00047 #ifndef COMMONCPP_CONFIG_H_
00048 #include <commoncpp/config.h>
00049 #endif
00050 
00051 #define KEYDATA_INDEX_SIZE  97
00052 #define KEYDATA_PAGER_SIZE  512
00053 #if defined(PATH_MAX)
00054 #if PATH_MAX > 512
00055 #define KEYDATA_PATH_SIZE   512
00056 #else
00057 #define KEYDATA_PATH_SIZE   PATH_MAX
00058 #endif
00059 #else
00060 #define KEYDATA_PATH_SIZE   256
00061 #endif
00062 
00063 namespace ost {
00064 
00065 class __EXPORT MemPager : private ucommon::memalloc
00066 {
00067 public:
00068     inline MemPager(size_t pagesize = 4096) : ucommon::memalloc(pagesize) {}
00069 
00070     inline void *alloc(size_t size)
00071         {return _alloc(size);}
00072 
00073     char *alloc(const char *str);
00074 
00075     inline char *first(const char *str)
00076         {return alloc(str);}
00077 
00078     inline void *first(size_t size)
00079         {return _alloc(size);}
00080 
00081     inline int getPages(void)
00082         {return pages();}
00083 
00084     inline void purge(void)
00085         {memalloc::purge();}
00086 };
00087 
00096 class __EXPORT SharedMemPager : public MemPager, public Mutex
00097 {
00098 protected:
00105     SharedMemPager(size_t pagesize = 4096);
00109     void purge(void);
00110 
00117     void* alloc(size_t size);
00118 
00119     inline void *first(size_t size)
00120         {return alloc(size);}
00121 };
00122 
00123 
00132 class __EXPORT Assoc
00133 {
00134 private:
00135     struct entry {
00136         const char *id;
00137         entry *next;
00138         void *data;
00139     };
00140 
00141     entry *entries[KEYDATA_INDEX_SIZE];
00142 
00143 protected:
00144     Assoc();
00145     virtual ~Assoc();
00146 
00147     void clear(void);
00148 
00149     virtual void *getMemory(size_t size) = 0;
00150 
00151 public:
00152     void *getPointer(const char *id) const;
00153     void setPointer(const char *id, void *data);
00154 };
00155 
00156 } // namespace ost
00157 #endif