1 files changed, 108 insertions, 0 deletions
diff --git a/gnuradio-runtime/swig/msg_queue.i b/gnuradio-runtime/swig/msg_queue.i
new file mode 100644
index 0000000000..59dff158ce
--- /dev/null
+++ b/gnuradio-runtime/swig/msg_queue.i
@@ -0,0 +1,108 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2005,2009-2011,2013 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.
+ */
+
+namespace gr {
+  /*!
+   * \brief thread-safe message queue
+   */
+  class msg_queue : public gr::msg_handler
+  {
+  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(gr::message::sptr msg) { insert_tail (msg); }
+
+    /*!
+     * \brief Insert message at tail of queue.
+     * \param msg message
+     *
+     * Block if queue if full.
+     */
+    //void insert_tail(gr::message::sptr msg);
+
+    /*!
+     * \brief Delete message from head of queue and return it.
+     * Block if no message is available.
+     */
+    //gr::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.
+     */
+    gr::message::sptr delete_head_nowait();
+
+    //! is the queue empty?
+    bool empty_p() const;
+
+    //! is the queue full?
+    bool full_p() const;
+
+    //! return number of messages in queue
+    unsigned int count() const;
+
+    //! Delete all messages from the queue
+    void flush();
+  };
+}
+
+/*
+ * The following kludge-o-rama releases the Python global interpreter
+ * lock around these potentially blocking calls.  We don't want
+ * libgnuradio-core to be dependent on Python, thus we create these
+ * functions that serve as replacements for the normal C++ delete_head
+ * and insert_tail methods.  The %pythoncode smashes these new C++
+ * functions into the gr.msg_queue wrapper class, so that everything
+ * appears normal.  (An evil laugh is heard in the distance...)
+ */
+#ifdef SWIGPYTHON
+%inline %{
+  gr::message::sptr py_msg_queue__delete_head(gr::msg_queue::sptr q) {
+    gr::message::sptr msg;
+    GR_PYTHON_BLOCKING_CODE(
+        msg = q->delete_head();
+    )
+    return msg;
+  }
+
+  void py_msg_queue__insert_tail(gr::msg_queue::sptr q, gr::message::sptr msg) {
+    GR_PYTHON_BLOCKING_CODE(
+        q->insert_tail(msg);
+    )
+  }
+%}
+
+// smash in new python delete_head and insert_tail methods...
+%template(msg_queue_sptr) boost::shared_ptr<gr::msg_queue>;
+%pythoncode %{
+msg_queue_sptr.delete_head = py_msg_queue__delete_head
+msg_queue_sptr.insert_tail = py_msg_queue__insert_tail
+msg_queue_sptr.handle = py_msg_queue__insert_tail
+msg_queue = msg_queue.make
+%}
+#endif	// SWIGPYTHON