sharedMemory.cpp Source File

00001 /*
00002  *                         Sun Public License Notice
00003  *
00004  * The contents of this file are subject to the Sun Public License
00005  * Version 1.0 (the "License"); you may not use this file except
00006  * in compliance with the License. A copy of the License is available
00007  * at http://www.sun.com/
00008  *
00009  * The Original Code is the Java Profiler module.  The Initial Developers
00010  * of the Original Code are Jan Stola, Pavel Vacha, Michal Pise, Petr Luner,
00011  * Lukas Petru and Marek Przeczek.
00012  *
00013  * Portions created by Jan Stola are Copyright (C) 2000-2001.
00014  * All Rights Reserved.
00015  *
00016  * Portions created by Pavel Vacha are Copyright (C) 2000-2001.
00017  * All Rights Reserved.
00018  *
00019  * Portions created by Michal Pise are Copyright (C) 2000-2001.
00020  * All Rights Reserved.
00021  *
00022  * Portions created by Petr Luner are Copyright (C) 2000-2001.
00023  * All Rights Reserved.
00024  *
00025  * Portions created by Lukas Petru are Copyright (C) 2000-2001.
00026  * All Rights Reserved.
00027  *
00028  * Portions created by Marek Przeczek are Copyright (C) 2000-2001.
00029  * All Rights Reserved.
00030  *
00031  * Contributors: Jan Stola, Pavel Vacha, Michal Pise, Petr Luner,
00032  *               Lukas Petru and Marek Przeczek.
00033  */
00034 
00035 #include "../commun3/sharedMemory.h"
00036 #include "../setup/setup.h"
00037 
00038 SharedMemory::SharedMemory( const String& name, int size) :
00039 
00040         _size( size) {
00041 
00042 #ifdef WIN32
00043         _shmid = CreateFileMapping( INVALID_HANDLE_VALUE, NULL,
00044                 PAGE_READWRITE | SEC_COMMIT, 0, _size, name);
00045         _address = MapViewOfFile( _shmid, FILE_MAP_ALL_ACCESS, 0, 0, 0);
00046 #else
00047         _size = Setup::COMMUN_SHMEM_SIZE;
00048         _shmid = shmget( *(key_t*)(const char*)name, _size, 0666 | IPC_CREAT);
00049         _address = shmat( _shmid, NULL, 0666);
00050 #endif
00051 }
00052 
00053 SharedMemory::~SharedMemory() {
00054         
00055 #ifdef WIN32
00056         UnmapViewOfFile( _address);
00057         CloseHandle( _shmid);
00058 #else
00059         /* only detach, don't destroy, another process
00060          * can be still using it ! shared memory block will
00061          * stay in system memory forever (til next start
00062          * of profiling or reboot) */
00063 
00064         shmdt( _address);
00065 #endif
00066 }