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/rleventlogserver.h

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+/***************************************************************************
+                          rleventlogserver.h  -  description
+                             -------------------
+    begin                : Wed Dec 18 2002
+    copyright            : (C) 2002 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_EVENT_LOG_SERVER_H_
+#define _RL_EVENT_LOG_SERVER_H_
+
+#include "rldefine.h"
+#include "rlevent.h"
+#include "rlthread.h"
+
+#define rlMAX_MESSAGES 128
+
+/*! <pre>
+A class for implementing an event log server.
+You may use it with rlevent.h
+</pre> */
+class rlEventLogServer
+{
+  public:
+    /*! <pre>
+    the event log files will be called:
+    filename<date-and-time>.rlEventLog
+    max_events = max number of events in one file
+    files may be purged by cron
+    </pre> */
+    rlEventLogServer(const char *filename=NULL, int max_events=10000);
+    virtual ~rlEventLogServer();
+
+    /*! <pre>
+    num is the event number
+    num = -1 will retrieve all events
+    </pre> */
+    const char *getEvent(char *buf, int *num);
+    void        putEvent(const char *event);
+
+  private:
+    char    memory[rlMAX_MESSAGES*rlMAX_EVENT];
+    rlMutex mutex;
+    int     front;
+    int     cnt;
+    char    *filename;
+    void    *fp;
+    int     max_events, num_events;
+};
+
+/*! <pre>
+This class starts a separate thread, that runs a rlEventLogServer log server.
+It waits on TCP port for clients. See rlevent.h
+</pre> */
+class rlEventLogServerThreads
+{
+  public:
+    /*! <pre>
+    event_log_server will not be deleted by the destructor
+    </pre> */
+    rlEventLogServerThreads(int port, rlEventLogServer *event_log_server);
+    virtual ~rlEventLogServerThreads();
+    void start();
+    int getPort();
+    rlEventLogServer *event_log_server;
+
+  private:
+    rlThread acceptThread;
+    int port;
+};
+
+#endif