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# memshm.h

    00001 //
    00002 // memshm.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_memshm_h
    00033 #define _util_group_memshm_h
    00034
    00035 #include <sys/types.h>
    00036 #include <sys/ipc.h>
    00037 #include <sys/shm.h>
    00038 #include <iostream>
    00039
    00040 #include <util/group/globcnt.h>
    00041 #include <util/group/memmsg.h>
    00042
    00043 #include <util/group/rnglock.h>
    00044
    00045 namespace sc {
    00046
    00050 class ShmMemoryGrp: public MsgMemoryGrp {
    00051   private:
    00052     int nregion_;
    00053     int *shmid_;
    00054     void **attach_address_;
    00055     GlobalCounter lock_;
    00056     GlobalCounter *update_;
    00057     void *data_;
    00058     void *memory_;
    00059     Pool *pool_;
    00060     RangeLock *rangelock_; // the locks_ member of the base class is ignored
    00061
    00062     void clear_release_count();
    00063     void wait_for_release();
    00064     void note_release();
    00065     void obtain_lock();
    00066     void release_lock();
    00067
    00068     void cleanup();
    00069     int attach_memory(void *ataddress, int size);
    00070     void detach_memory();
    00071   public:
    00072     ShmMemoryGrp(const Ref<MessageGrp>& msg);
    00073     ShmMemoryGrp(const Ref<KeyVal>&);
    00074     ~ShmMemoryGrp();
    00075
    00076     void set_localsize(size_t);
    00077     void *localdata();
    00078
    00079     void *obtain_readwrite(distsize_t offset, int size);
    00080     void *obtain_readonly(distsize_t offset, int size);
    00081     void *obtain_writeonly(distsize_t offset, int size);
    00082     void release_readonly(void *data, distsize_t offset, int size);
    00083     void release_writeonly(void *data, distsize_t offset, int size);
    00084     void release_readwrite(void *data, distsize_t offset, int size);
    00085
    00086     void print(std::ostream &o = ExEnv::out0()) const;
    00087 };
    00088
    00089 }
    00090
    00091 #endif
    00092
    00093 // Local Variables:
    00094 // mode: c++
    00095 // c-file-style: "CLJ"
    00096 // End: