搭建PVB架构，实现前端的基础布局、菜单、表格、图示等功能

libs/pvb/include/rllib/rlsharedmemory.h

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+/***************************************************************************
+                          rlsharedmemory.h  -  description
+                             -------------------
+    begin                : Tue Jan 02 2001
+    copyright            : (C) 2001 by R. Lehrig
+    email                : lehrig@t-online.de
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU LESSER GENERAL PUBLIC LICENSE as        *
+ *   published by the Free Software Foundation                             *
+ *                                                                         *
+ ***************************************************************************/
+#ifndef _RL_SHARED_MEMORY_H_
+#define _RL_SHARED_MEMORY_H_
+
+#include "rldefine.h"
+#include "rlwthread.h"
+
+/*! <pre>
+class for a shared memory.
+
+A shared memory is a piece of RAM that is shared between processes.
+If many processes have access to the same RAM, it is necessary to lock the shared memory.
+The read/write methods will do this and copy the data to local data.
+If you want direct access, you may use getUserAdr().
+</pre> */
+class rlSharedMemory
+{
+public:
+  enum SharedMemoryEnum
+  {
+    OK = 0,
+    ERROR_FILE,
+    ERROR_SHMGET,
+    ERROR_SHMAT,
+    ERROR_SHMCTL
+  };
+
+  /*! rwmode := access rights under unix. default 0600 user=read,write */
+  rlSharedMemory(const char *name, unsigned long size, int rwmode=0600);
+  virtual ~rlSharedMemory();
+  int   deleteSharedMemory();
+  int   write(unsigned long offset, const void *buf, int len);
+  int   read (unsigned long offset, void *buf, int len);
+  int   readInt(unsigned long offset, int index);
+  int   readShort(unsigned long offset, int index);
+  int   readByte(unsigned long offset, int index);
+  float readFloat(unsigned long offset, int index);
+  int   writeInt(unsigned long offset, int index, int val);
+  int   writeShort(unsigned long offset, int index, int val);
+  int   writeByte(unsigned long offset, int index, unsigned char val);
+  int   writeFloat(unsigned long offset, int index, float val);
+  void  *getUserAdr();
+  int   shmKey();
+  int   shmId();
+  unsigned long size();
+  int   status;
+  char *name;
+private:
+  int id;
+  int shmkey;
+  char *base_adr;
+  char *user_adr;
+  unsigned long _size;
+  pthread_mutex_t *mutex;
+#ifdef RLWIN32
+  HANDLE hSharedFile;
+  OVERLAPPED overlapped;
+#elif defined(RLUNIX)
+  int fdlock;
+#endif
+};
+
+#endif