1 files changed, 105 insertions, 0 deletions
diff --git a/gnuradio-runtime/lib/messages/msg_queue.cc b/gnuradio-runtime/lib/messages/msg_queue.cc
new file mode 100644
index 0000000000..0d460dc05c
--- /dev/null
+++ b/gnuradio-runtime/lib/messages/msg_queue.cc
@@ -0,0 +1,105 @@
+/* -*- 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <messages/msg_queue.h>
+#include <stdexcept>
+
+using namespace pmt;
+
+namespace gr {
+  namespace messages {
+
+    msg_queue_sptr
+    make_msg_queue(unsigned int limit)
+    {
+      return msg_queue_sptr(new msg_queue(limit));
+    }
+
+    msg_queue::msg_queue(unsigned int limit)
+      : d_limit(limit)
+    {
+    }
+
+    msg_queue::~msg_queue()
+    {
+      flush();
+    }
+
+    void
+    msg_queue::insert_tail(pmt_t msg)
+    {
+      gr::thread::scoped_lock guard(d_mutex);
+
+      while(full_p())
+        d_not_full.wait(guard);
+
+      d_msgs.push_back(msg);
+      d_not_empty.notify_one();
+    }
+
+    pmt_t
+    msg_queue::delete_head()
+    {
+      gr::thread::scoped_lock guard(d_mutex);
+
+      while(empty_p())
+        d_not_empty.wait(guard);
+
+      pmt_t m(d_msgs.front());
+      d_msgs.pop_front();
+
+      if(d_limit > 0)		// Unlimited length queues never block on write
+        d_not_full.notify_one();
+
+      return m;
+    }
+
+    pmt_t
+    msg_queue::delete_head_nowait()
+    {
+      gr::thread::scoped_lock guard(d_mutex);
+
+      if(empty_p())
+        return pmt_t();
+
+      pmt_t m(d_msgs.front());
+      d_msgs.pop_front();
+
+      if(d_limit > 0)		// Unlimited length queues never block on write
+        d_not_full.notify_one();
+
+      return m;
+    }
+
+    void
+    msg_queue::flush()
+    {
+      while(delete_head_nowait() != pmt_t())
+        ;
+    }
+    
+  } /* namespace messages */
+} /* namespace gr */