/usr/include/sc/util/group/memshm.h is in libsc-dev 2.3.1-16.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// memshm.h
//
// Copyright (C) 1996 Limit Point Systems, Inc.
//
// Author: Curtis Janssen <cljanss@limitpt.com>
// Maintainer: LPS
//
// This file is part of the SC Toolkit.
//
// The SC Toolkit is free software; you can redistribute it and/or modify
// it under the terms of the GNU Library General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
//
// The SC Toolkit 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 Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public License
// along with the SC Toolkit; see the file COPYING.LIB. If not, write to
// the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
//
// The U.S. Government is granted a limited license as per AL 91-7.
//
#ifdef __GNUC__
#pragma interface
#endif
#ifndef _util_group_memshm_h
#define _util_group_memshm_h
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <iostream>
#include <util/group/globcnt.h>
#include <util/group/memmsg.h>
#include <util/group/rnglock.h>
namespace sc {
/** The ShmMemoryGrp concrete class provides an implementation of
MsgMemoryGrp. It uses SYSV IPC to provided shared memory in a system that
provide shared memory in hardware. It is very fast and reliable. */
class ShmMemoryGrp: public MsgMemoryGrp {
private:
int nregion_;
int *shmid_;
void **attach_address_;
GlobalCounter lock_;
GlobalCounter *update_;
void *data_;
void *memory_;
Pool *pool_;
RangeLock *rangelock_; // the locks_ member of the base class is ignored
void clear_release_count();
void wait_for_release();
void note_release();
void obtain_lock();
void release_lock();
void cleanup();
int attach_memory(void *ataddress, int size);
void detach_memory();
public:
ShmMemoryGrp(const Ref<MessageGrp>& msg);
ShmMemoryGrp(const Ref<KeyVal>&);
~ShmMemoryGrp();
void set_localsize(size_t);
void *localdata();
void *obtain_readwrite(distsize_t offset, int size);
void *obtain_readonly(distsize_t offset, int size);
void *obtain_writeonly(distsize_t offset, int size);
void release_readonly(void *data, distsize_t offset, int size);
void release_writeonly(void *data, distsize_t offset, int size);
void release_readwrite(void *data, distsize_t offset, int size);
void print(std::ostream &o = ExEnv::out0()) const;
};
}
#endif
// Local Variables:
// mode: c++
// c-file-style: "CLJ"
// End:
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