1 files changed, 95 insertions, 0 deletions
diff --git a/gnuradio-runtime/include/gnuradio/messages/msg_queue.h b/gnuradio-runtime/include/gnuradio/messages/msg_queue.h
new file mode 100644
index 0000000000..dfe1ca97be
--- /dev/null
+++ b/gnuradio-runtime/include/gnuradio/messages/msg_queue.h
@@ -0,0 +1,95 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2009,2013 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_MSG_QUEUE_H
+#define INCLUDED_MSG_QUEUE_H
+
+#include <gnuradio/api.h>
+#include <gnuradio/thread/thread.h>
+#include <pmt/pmt.h>
+#include <deque>
+
+namespace gr {
+  namespace messages {
+
+    class msg_queue;
+    typedef boost::shared_ptr<msg_queue> msg_queue_sptr;
+
+    msg_queue_sptr make_msg_queue(unsigned int limit=0);
+
+    /*!
+     * \brief thread-safe message queue
+     */
+    class GR_RUNTIME_API msg_queue
+    {
+    private:
+      gr::thread::mutex              d_mutex;
+      gr::thread::condition_variable d_not_empty;
+      gr::thread::condition_variable d_not_full;
+      unsigned int  d_limit;  // max # of messages in queue.  0 -> unbounded
+
+      std::deque<pmt::pmt_t> d_msgs;
+
+    public:
+      msg_queue(unsigned int limit);
+      ~msg_queue();
+
+      /*!
+       * \brief Insert message at tail of queue.
+       * \param msg message
+       *
+       * Block if queue if full.
+       */
+      void insert_tail(pmt::pmt_t msg);
+
+      /*!
+       * \brief Delete message from head of queue and return it.
+       * Block if no message is available.
+       */
+      pmt::pmt_t delete_head();
+
+      /*!
+       * \brief If there's a message in the q, delete it and return it.
+       * If no message is available, return pmt::pmt_t().
+       */
+      pmt::pmt_t delete_head_nowait();
+
+      //! Delete all messages from the queue
+      void flush();
+
+      //! is the queue empty?
+      bool empty_p() const { return d_msgs.empty(); }
+
+      //! is the queue full?
+      bool full_p() const { return d_limit != 0 && count() >= d_limit; }
+
+      //! return number of messages in queue
+      unsigned int count() const { return d_msgs.size(); }
+
+      //! return limit on number of message in queue.  0 -> unbounded
+      unsigned int limit() const { return d_limit; }
+    };
+
+  } /* namespace messages */
+} /* namespace gr */
+
+#endif /* INCLUDED_MSG_QUEUE_H */