1 files changed, 72 insertions, 0 deletions
diff --git a/gnuradio-runtime/lib/gr_sptr_magic.cc b/gnuradio-runtime/lib/gr_sptr_magic.cc
new file mode 100644
index 0000000000..2073701422
--- /dev/null
+++ b/gnuradio-runtime/lib/gr_sptr_magic.cc
@@ -0,0 +1,72 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2009 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 <gr_sptr_magic.h>
+#include <gr_hier_block2.h>
+#include <map>
+#include <stdexcept>
+
+
+#include <thread/thread.h>
+
+namespace gnuradio {
+
+  static gr::thread::mutex	s_mutex;
+  typedef std::map<gr_basic_block*, gr_basic_block_sptr> sptr_map;
+  static sptr_map	s_map;
+
+  void
+  detail::sptr_magic::create_and_stash_initial_sptr(gr_hier_block2 *p)
+  {
+    gr_basic_block_sptr sptr(p);
+    gr::thread::scoped_lock guard(s_mutex);
+    s_map.insert(sptr_map::value_type(static_cast<gr_basic_block *>(p), sptr));
+  }
+
+
+  gr_basic_block_sptr
+  detail::sptr_magic::fetch_initial_sptr(gr_basic_block *p)
+  {
+    /*
+     * If p isn't a subclass of gr_hier_block2, just create the
+     * shared ptr and return it.
+     */
+    gr_hier_block2 *hb2 = dynamic_cast<gr_hier_block2 *>(p);
+    if (!hb2){
+      return gr_basic_block_sptr(p);
+    }
+
+    /*
+     * p is a subclass of gr_hier_block2, thus we've already created the shared pointer
+     * and stashed it away.  Fish it out and return it.
+     */
+    gr::thread::scoped_lock guard(s_mutex);
+    sptr_map::iterator pos = s_map.find(static_cast<gr_basic_block *>(p));
+    if (pos == s_map.end())
+      throw std::invalid_argument("gr_sptr_magic: invalid pointer!");
+
+    gr_basic_block_sptr sptr = pos->second;
+    s_map.erase(pos);
+    return sptr;
+  }
+};