1 files changed, 126 insertions, 0 deletions
diff --git a/gr-blocks/lib/stream_pdu_base.cc b/gr-blocks/lib/stream_pdu_base.cc
new file mode 100644
index 0000000000..3378067f85
--- /dev/null
+++ b/gr-blocks/lib/stream_pdu_base.cc
@@ -0,0 +1,126 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 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
+
+#ifdef HAVE_IO_H
+#include <io.h>
+#endif
+
+#include <gr_pdu.h>
+#include <gr_basic_block.h>
+#include "stream_pdu_base.h"
+#include <boost/format.hpp>
+
+static const long timeout_us = 100*1000; //100ms
+
+namespace gr {
+  namespace blocks {
+
+    stream_pdu_base::stream_pdu_base(int MTU)
+      :	d_fd(-1),
+	d_started(false), 
+	d_finished(false)
+    {
+      // reserve space for rx buffer 
+      d_rxbuf.resize(MTU,0);
+    }
+    
+    stream_pdu_base::~stream_pdu_base()
+    {
+      stop_rxthread();
+    }
+
+    void
+    stream_pdu_base::start_rxthread(gr_basic_block *blk, pmt::pmt_t port)
+    {
+      d_blk = blk;
+      d_port = port;
+      d_thread = gruel::thread(boost::bind(&stream_pdu_base::run, this));
+      d_started = true;
+    }
+
+    void
+    stream_pdu_base::stop_rxthread()
+    {
+      d_finished = true;
+
+      if (d_started) {
+        d_thread.interrupt();
+        d_thread.join();
+      }
+    }
+
+    void
+    stream_pdu_base::run()
+    {
+      while(!d_finished) {
+        if (!wait_ready())
+	  continue;
+
+        const int result = read(d_fd, &d_rxbuf[0], d_rxbuf.size());
+        if (result <= 0)
+	  throw std::runtime_error("stream_pdu_base, bad socket read!");
+
+        pmt::pmt_t vector = pmt::pmt_init_u8vector(result, &d_rxbuf[0]);       
+        pmt::pmt_t pdu = pmt::pmt_cons(pmt::PMT_NIL, vector);
+
+        d_blk->message_port_pub(d_port, pdu);
+      } 
+    }
+
+    bool
+    stream_pdu_base::wait_ready()
+    {
+      //setup timeval for timeout
+      timeval tv;
+      tv.tv_sec = 0;
+      tv.tv_usec = timeout_us;
+    
+      //setup rset for timeout
+      fd_set rset;
+      FD_ZERO(&rset);
+      FD_SET(d_fd, &rset);
+      
+      //call select with timeout on receive socket
+      return ::select(d_fd+1, &rset, NULL, NULL, &tv) > 0;
+    }
+
+    void
+    stream_pdu_base::send(pmt::pmt_t msg)
+    {
+      pmt::pmt_t vector = pmt::pmt_cdr(msg);
+      size_t offset(0);
+      size_t itemsize(::gr_pdu_itemsize(type_from_pmt(vector)));
+      int len(pmt::pmt_length(vector)*itemsize);
+    
+      const int rv = write(d_fd, pmt::pmt_uniform_vector_elements(vector, offset), len);
+      if (rv != len) {
+        std::cerr << boost::format("WARNING: gr_stream_pdu_base::send(pdu) write failed! (d_fd=%d, len=%d, rv=%d)")
+	  % d_fd % len % rv << std::endl;
+      }
+    }
+
+  } /* namespace blocks */
+} /* namespace gr */