BESMemoryGlobalArea.h

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00001 // BESMemoryGlobalArea.h
00002 
00003 // This file is part of bes, A C++ back-end server implementation framework
00004 // for the OPeNDAP Data Access Protocol.
00005 
00006 // Copyright (c) 2004-2009 University Corporation for Atmospheric Research
00007 // Author: Patrick West <pwest@ucar.edu> and Jose Garcia <jgarcia@ucar.edu>
00008 //
00009 // This library is free software; you can redistribute it and/or
00010 // modify it under the terms of the GNU Lesser General Public
00011 // License as published by the Free Software Foundation; either
00012 // version 2.1 of the License, or (at your option) any later version.
00013 // 
00014 // This library is distributed in the hope that it will be useful,
00015 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00016 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017 // Lesser General Public License for more details.
00018 // 
00019 // You should have received a copy of the GNU Lesser General Public
00020 // License along with this library; if not, write to the Free Software
00021 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00022 //
00023 // You can contact University Corporation for Atmospheric Research at
00024 // 3080 Center Green Drive, Boulder, CO 80301
00025  
00026 // (c) COPYRIGHT University Corporation for Atmospheric Research 2004-2005
00027 // Please read the full copyright statement in the file COPYRIGHT_UCAR.
00028 //
00029 // Authors:
00030 //      pwest       Patrick West <pwest@ucar.edu>
00031 //      jgarcia     Jose Garcia <jgarcia@ucar.edu>
00032 
00033 #ifndef BESMemoryGlobalArea_h_
00034 #define BESMemoryGlobalArea_h_ 1
00035 
00036 #include <sys/resource.h>
00037 
00038 #include "BESObj.h"
00039 
00040 #define MEGABYTE 1024*1024
00041 
00042 class BESMemoryGlobalArea : public BESObj
00043 {
00044     struct rlimit limit ;
00045     static unsigned long _size ;
00046     static int _counter ;
00047     static void *_buffer ;
00048 
00049     unsigned long megabytes( unsigned int s ) 
00050     {
00051         return s*MEGABYTE ;
00052     }
00053     void                        log_limits( const string &msg ) ;
00054 
00055 public:
00056                                 BESMemoryGlobalArea() ;
00057                                 ~BESMemoryGlobalArea() ;
00058 
00059     void                        release_memory() ;
00060     bool                        reclaim_memory() ;
00061     unsigned long               SizeOfEmergencyPool() { return _size; }
00062 
00063     virtual void                dump( ostream &strm ) const ;
00064 };
00065 
00066 #endif // BESMemoryGlobalArea_h_
00067 

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