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# file.h

    00001 //
    00002 // file.h
    00003 //
    00004 // Copyright (C) 1996 Limit Point Systems, Inc.
    00005 //
    00006 // Author: Curtis Janssen <cljanss@limitpt.com>
    00007 // Maintainer: LPS
    00008 //
    00009 // This file is part of the SC Toolkit.
    00010 //
    00011 // The SC Toolkit is free software; you can redistribute it and/or modify
    00012 // it under the terms of the GNU Library General Public License as published by
    00013 // the Free Software Foundation; either version 2, or (at your option)
    00014 // any later version.
    00015 //
    00016 // The SC Toolkit is distributed in the hope that it will be useful,
    00017 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00018 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00019 // GNU Library General Public License for more details.
    00020 //
    00021 // You should have received a copy of the GNU Library General Public License
    00022 // along with the SC Toolkit; see the file COPYING.LIB.  If not, write to
    00023 // the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
    00024 //
    00025 // The U.S. Government is granted a limited license as per AL 91-7.
    00026 //
    00027
    00028 #ifdef __GNUC__
    00029 #pragma interface
    00030 #endif
    00031
    00032 #ifndef _util_group_file_h
    00033 #define _util_group_file_h
    00034
    00035 #include <iostream>
    00036
    00037 #include <scconfig.h>
    00038 #include <util/class/class.h>
    00039 #include <util/group/thread.h>
    00040 #include <util/group/memory.h>
    00041
    00042 namespace sc {
    00043
    00055 class FileGrp: public DescribedClass {
    00056   private:
    00057     int datafile_;
    00058     char *filename_;
    00059
    00060     Ref<ThreadLock> *locks_;
    00061     int nlock_;
    00062
    00063     void init_locks();
    00064
    00065
    00066   protected:
    00067
    00068     // derived classes must fill in all these
    00069     // ~FileGrp deletes the arrays
    00070     int me_;
    00071     int n_;
    00072     distsize_t *offsets_; // offsets_[n_] is the fence for all data
    00073
    00074     // set to nonzero for debugging information
    00075     int debug_;
    00076
    00077     void obtain_local_lock(size_t start, size_t fence);
    00078     void release_local_lock(size_t start, size_t fence);
    00079   public:
    00080     FileGrp();
    00081     FileGrp(const Ref<KeyVal>&);
    00082     virtual ~FileGrp();
    00083
    00085     void open();
    00087     void close();
    00089     void set_filename(char *name);
    00091     const char* get_filename() const { return datafile_; };
    00092
    00094     int me() const { return me_; }
    00096     int n() const { return n_; }
    00097
    00101     virtual void set_localsize(size_t) = 0;
    00103     size_t localsize() { return distsize_to_size(offsets_[me_+1]-offsets_[me_]); }
    00105     distsize_t localoffset() { return offsets_[me_]; }
    00107     int size(int node)
    00108         { return distsize_to_size(offsets_[node+1] - offsets_[node]); }
    00110     distsize_t offset(int node) { return offsets_[node]; }
    00112     distsize_t totalsize() { return offsets_[n_]; }
    00113
    00115     virtual void activate();
    00117     virtual void deactivate();
    00118
    00120     virtual void *obtain_writeonly(distsize_t offset, int size) = 0;
    00126     virtual void *obtain_readwrite(distsize_t offset, int size) = 0;
    00128     virtual void *obtain_readonly(distsize_t offset, int size) = 0;
    00130     virtual void release_readonly(void *data, distsize_t offset, int size) = 0;
    00132     virtual void release_writeonly(void *data, distsize_t offset, int size)=0;
    00135     virtual void release_readwrite(void *data, distsize_t offset, int size)=0;
    00136
    00137     virtual void sum_reduction(double *data, distsize_t doffset, int dsize);
    00138     virtual void sum_reduction_on_node(double *data, size_t doffset, int dsize,
    00139                                        int node = -1);
    00140
    00143     virtual void sync() = 0;
    00144
    00151     virtual void catchup();
    00152
    00154     virtual void print(std::ostream &o = ExEnv::out0()) const;
    00155
    00163     static FileGrp* initial_filegrp(int &argc, char** argv);
    00164     static FileGrp* initial_filegrp();
    00167     static void set_default_filegrp(const Ref<FileGrp>&);
    00169     static FileGrp* get_default_filegrp();
    00171     virtual FileGrp* clone() =0;
    00172 };
    00173
    00174 }
    00175
    00176 #endif
    00177
    00178 // Local Variables:
    00179 // mode: c++
    00180 // c-file-style: "CLJ"
    00181 // End: