1 files changed, 95 insertions, 0 deletions
diff --git a/gnuradio-runtime/include/gnuradio/msg_queue.h b/gnuradio-runtime/include/gnuradio/msg_queue.h
new file mode 100644
index 0000000000..3326cf9a7f
--- /dev/null
+++ b/gnuradio-runtime/include/gnuradio/msg_queue.h
@@ -0,0 +1,95 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2005,2009 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_GR_MSG_QUEUE_H
+#define INCLUDED_GR_MSG_QUEUE_H
+
+#include <gnuradio/api.h>
+#include <gnuradio/msg_handler.h>
+#include <gnuradio/thread/thread.h>
+
+namespace gr {
+
+  /*!
+   * \brief thread-safe message queue
+   * \ingroup misc
+   */
+  class GR_RUNTIME_API msg_queue : public msg_handler
+  {
+    gr::thread::mutex d_mutex;
+    gr::thread::condition_variable d_not_empty;
+    gr::thread::condition_variable d_not_full;
+    message::sptr d_head;
+    message::sptr d_tail;
+    unsigned int d_count;    // # of messages in queue.
+    unsigned int d_limit;    // max # of messages in queue.  0 -> unbounded
+
+  public:
+    typedef boost::shared_ptr<msg_queue> sptr;
+
+    static sptr make(unsigned int limit=0);
+
+    msg_queue(unsigned int limit);
+    ~msg_queue();
+
+    //! Generic msg_handler method: insert the message.
+    void handle(message::sptr msg) { insert_tail (msg); }
+
+    /*!
+     * \brief Insert message at tail of queue.
+     * \param msg message
+     *
+     * Block if queue if full.
+     */
+    void insert_tail(message::sptr msg);
+
+    /*!
+     * \brief Delete message from head of queue and return it.
+     * Block if no message is available.
+     */
+    message::sptr delete_head();
+
+    /*!
+     * \brief If there's a message in the q, delete it and return it.
+     * If no message is available, return 0.
+     */
+    message::sptr delete_head_nowait();
+
+    //! Delete all messages from the queue
+    void flush();
+
+    //! is the queue empty?
+    bool empty_p() const { return d_count == 0; }
+
+    //! is the queue full?
+    bool full_p() const { return d_limit != 0 && d_count >= d_limit; }
+
+    //! return number of messages in queue
+    unsigned int count() const { return d_count; }
+
+    //! return limit on number of message in queue.  0 -> unbounded
+    unsigned int limit() const { return d_limit; }
+  };
+
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_MSG_QUEUE_H */