1 files changed, 71 insertions, 0 deletions
diff --git a/gnuradio-runtime/lib/tpb_detail.cc b/gnuradio-runtime/lib/tpb_detail.cc
new file mode 100644
index 0000000000..cf05c2b102
--- /dev/null
+++ b/gnuradio-runtime/lib/tpb_detail.cc
@@ -0,0 +1,71 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2009,2013 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <gnuradio/tpb_detail.h>
+#include <gnuradio/block.h>
+#include <gnuradio/block_detail.h>
+#include <gnuradio/buffer.h>
+
+namespace gr {
+
+  /*
+   * We assume that no worker threads are ever running when the graph
+   * structure is being manipulated, thus it's safe for us to poke
+   * around in our neighbors w/o holding any locks.
+   */
+  void
+  tpb_detail::notify_upstream(block_detail *d)
+  {
+    // For each of our inputs, tell the guy upstream that we've
+    // consumed some input, and that he most likely has more output
+    // buffer space available.
+
+    for(size_t i = 0; i < d->d_input.size(); i++) {
+      // Can you say, "pointer chasing?"
+      d->d_input[i]->buffer()->link()->detail()->d_tpb.set_output_changed();
+    }
+  }
+
+  void
+  tpb_detail::notify_downstream(block_detail *d)
+  {
+    // For each of our outputs, tell the guys downstream that they
+    // have new input available.
+
+    for(size_t i = 0; i < d->d_output.size(); i++) {
+      buffer_sptr buf = d->d_output[i];
+      for(size_t j = 0, k = buf->nreaders(); j < k; j++)
+        buf->reader(j)->link()->detail()->d_tpb.set_input_changed();
+    }
+  }
+
+  void
+  tpb_detail::notify_neighbors(block_detail *d)
+  {
+    notify_downstream(d);
+    notify_upstream(d);
+  }
+
+} /* namespace gr */