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  @file           heo41.h
  @author         JoergM
  @special area   Shared Memory Access Functions
  @brief          Allows to create shared memory chunks
  @first created  1999-11-29  11:00

                Used i.e. to switch precompiler trace ON/OFF during runtime.


    ========== licence begin  GPL
    Copyright (c) 2000-2005 SAP AG

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
    ========== licence end


#ifndef HEO41_H
#define HEO41_H

#ifdef __cplusplus
#define externC extern "C"
#define externC

 *  INCLUDES                                                                 *

 *  FUNCTION PROTOTYPES                                                      *

   @Description    Allocate a shared memory chunk identified by path

               If path points to an existing Shared Memory Object in the file system,
               it is opened, otherwise it is created (Read/Writable). The path does 
               not only uniquely identifies the shared memory chunk, but allows to 
               access the information even if the creator process already terminated.
   @Parameter      Path [in] Path to Shared memory chunk
        SizeInBytes [in] Size of Chunk in Bytes
   @Return value   Address of Shared Memory Segment or NULL if call failed or Path is not Read/Writable


externC void *sqlAllocSharedMem(const char *Path, const unsigned int SizeInBytes);

   @Description    Free a shared memory chunk

               This releases a mapped shared memory chunk from process.
               Since the UNIX Interface needs the size of the previous allocated chunk,
               the size information is needed when returning the chunk too.
   @Parameter      ShmAddress  [in] Address returned by a previous call to sqlAllocSharedMem
        SizeInBytes [in] Number of bytes requested by a previous call to sqlAllocSharedMem
   @Return value   none


externC void sqlFreeSharedMem(void *ShmAddress, const unsigned int SizeInBytes);

#endif  /* HEO41_H */

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