3 files changed, 21 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/io/gr_message_source.cc b/gnuradio-core/src/lib/io/gr_message_source.cc
index 3fbe3708e..3efc5b321 100644
--- a/gnuradio-core/src/lib/io/gr_message_source.cc
+++ b/gnuradio-core/src/lib/io/gr_message_source.cc
@@ -43,6 +43,13 @@ gr_make_message_source(size_t itemsize, int msgq_limit)
   return gr_message_source_sptr(new gr_message_source(itemsize, msgq_limit));
 }
 
+// public constructor that takes existing message queue
+gr_message_source_sptr
+gr_make_message_source(size_t itemsize, gr_msg_queue_sptr msgq)
+{
+  return gr_message_source_sptr(new gr_message_source(itemsize, msgq));
+}
+
 gr_message_source::gr_message_source (size_t itemsize, int msgq_limit)
   : gr_sync_block("message_source",
 		  gr_make_io_signature(0, 0, 0),
@@ -51,6 +58,14 @@ gr_message_source::gr_message_source (size_t itemsize, int msgq_limit)
 {
 }
 
+gr_message_source::gr_message_source (size_t itemsize, gr_msg_queue_sptr msgq)
+  : gr_sync_block("message_source",
+		  gr_make_io_signature(0, 0, 0),
+		  gr_make_io_signature(1, 1, itemsize)),
+    d_itemsize(itemsize), d_msgq(msgq), d_msg_offset(0), d_eof(false)
+{
+}
+
 gr_message_source::~gr_message_source()
 {
 }
diff --git a/gnuradio-core/src/lib/io/gr_message_source.h b/gnuradio-core/src/lib/io/gr_message_source.h
index 5a5c6a5d8..46a808754 100644
--- a/gnuradio-core/src/lib/io/gr_message_source.h
+++ b/gnuradio-core/src/lib/io/gr_message_source.h
@@ -31,6 +31,7 @@ class gr_message_source;
 typedef boost::shared_ptr<gr_message_source> gr_message_source_sptr;
 
 gr_message_source_sptr gr_make_message_source (size_t itemsize, int msgq_limit=0);
+gr_message_source_sptr gr_make_message_source (size_t itemsize, gr_msg_queue_sptr msgq);
 
 /*!
  * \brief Turn received messages into a stream
@@ -47,9 +48,12 @@ class gr_message_source : public gr_sync_block
 
   friend gr_message_source_sptr
   gr_make_message_source(size_t itemsize, int msgq_limit);
+  friend gr_message_source_sptr
+  gr_make_message_source(size_t itemsize, gr_msg_queue_sptr msgq);
 
  protected:
   gr_message_source (size_t itemsize, int msgq_limit);
+  gr_message_source (size_t itemsize, gr_msg_queue_sptr msgq);
 
  public:
   ~gr_message_source ();
diff --git a/gnuradio-core/src/lib/io/gr_message_source.i b/gnuradio-core/src/lib/io/gr_message_source.i
index fdc74741e..8a9c762d0 100644
--- a/gnuradio-core/src/lib/io/gr_message_source.i
+++ b/gnuradio-core/src/lib/io/gr_message_source.i
@@ -23,11 +23,13 @@
 GR_SWIG_BLOCK_MAGIC(gr,message_source);
 
 gr_message_source_sptr gr_make_message_source (size_t itemsize, int msgq_limit=0);
+gr_message_source_sptr gr_make_message_source (size_t itemsize, gr_msg_queue_sptr msgq);
 
 class gr_message_source : public gr_sync_block
 {
  protected:
   gr_message_source (size_t itemsize, int msgq_limit);
+  gr_message_source (size_t itemsize, gr_msg_queue_sptr msgq);
 
  public:
   ~gr_message_source ();