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gr_msg_queue.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2005 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio
00006  * 
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00020  * Boston, MA 02111-1307, USA.
00021  */
00022 #ifndef INCLUDED_GR_MSG_QUEUE_H
00023 #define INCLUDED_GR_MSG_QUEUE_H
00024 
00025 #include <gr_msg_handler.h>
00026 #include <omnithread.h>
00027 
00028 class gr_msg_queue;
00029 typedef boost::shared_ptr<gr_msg_queue> gr_msg_queue_sptr;
00030 
00031 gr_msg_queue_sptr gr_make_msg_queue ();
00032 
00036 class gr_msg_queue : public gr_msg_handler {
00037   omni_mutex            d_mutex;
00038   omni_condition        d_cond;
00039   gr_message_sptr       d_head;
00040   gr_message_sptr       d_tail;
00041   int                   d_count;
00042 
00043 public:
00044   gr_msg_queue ();
00045   ~gr_msg_queue ();
00046 
00048   void handle (gr_message_sptr msg) { insert_tail (msg); }
00049 
00054   void insert_tail (gr_message_sptr msg);
00055 
00060   gr_message_sptr delete_head ();
00061 
00066   gr_message_sptr delete_head_nowait ();
00067   
00069   bool empty_p () const { return d_count == 0; }
00070   
00072   int count () const { return d_count; }
00073 
00075   void flush ();
00076 };
00077 
00078 #endif /* INCLUDED_GR_MSG_QUEUE_H */

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