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/rlfifo.h

@@ -0,0 +1,57 @@
+/***************************************************************************
+                          rlfifo.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_FIFO_H_
+#define _RL_FIFO_H_
+
+#include "rldefine.h"
+#include "rlthread.h"
+
+/*! <pre>
+class for a fifo. (first in first out)
+</pre> */
+class rlFifo
+{
+private:
+  typedef struct _MessageList_
+  {
+    char *mes;
+    int  len;
+    struct _MessageList_ *next;
+  }MessageList;
+
+public:
+  rlFifo(int maxmessages=0);
+  virtual ~rlFifo();
+
+  enum FifoEnum {
+       DATA_AVAILABLE=-1, NO_DATA_AVAILABLE=-2, MESSAGE_TO_BIG=-3, FIFO_FULL=-4
+  };
+
+  int read(void *buf, int maxlen);
+  int poll();
+  int nmesAvailable();
+  int write(const void *buf, int len);
+  int printf(const char *format, ...);
+
+private:
+  int maxmes;
+  int nmes;
+  MessageList *list;
+  WSEMAPHORE semaphore;
+  pthread_mutex_t mutex;
+};
+
+#endif