4 files changed, 70 insertions, 16 deletions
diff --git a/gruel/src/swig/CMakeLists.txt b/gruel/src/swig/CMakeLists.txt
index 7d69ee549..6f636fc3f 100644
--- a/gruel/src/swig/CMakeLists.txt
+++ b/gruel/src/swig/CMakeLists.txt
@@ -38,7 +38,7 @@ GR_SWIG_INSTALL(
 )
 
 install(
-    FILES gr_intrusive_ptr.i pmt_swig.i
+    FILES gr_intrusive_ptr.i pmt_swig.i gruel_common.i
     ${CMAKE_CURRENT_BINARY_DIR}/pmt_swig_doc.i
     DESTINATION ${GR_INCLUDE_DIR}/gnuradio/swig
     COMPONENT "gruel_swig"
diff --git a/gruel/src/swig/Makefile.am b/gruel/src/swig/Makefile.am
index 9953d5566..ce0a32513 100644
--- a/gruel/src/swig/Makefile.am
+++ b/gruel/src/swig/Makefile.am
@@ -61,6 +61,7 @@ pmt_swig_la_swig_libadd = \
 
 # additional SWIG files to be installed
 pmt_swig_swiginclude_headers =  \
+	gruel_common.i \
 	gr_intrusive_ptr.i \
 	$(TOP_SWIG_DOC_IFILES)
 
diff --git a/gruel/src/swig/gruel_common.i b/gruel/src/swig/gruel_common.i
new file mode 100644
index 000000000..e4261cbfa
--- /dev/null
+++ b/gruel/src/swig/gruel_common.i
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2011 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.
+ */
+
+#ifndef GRUEL_COMMON_I
+#define GRUEL_COMMON_I
+
+////////////////////////////////////////////////////////////////////////
+// Language independent exception handler
+////////////////////////////////////////////////////////////////////////
+%include exception.i
+
+%exception {
+    try {
+        $action
+    }
+    catch(std::exception &e) {
+        SWIG_exception(SWIG_RuntimeError, e.what());
+    }
+    catch(...) {
+        SWIG_exception(SWIG_RuntimeError, "Unknown exception");
+    }
+
+}
+
+////////////////////////////////////////////////////////////////////////
+// Wrapper for python calls that may block
+////////////////////////////////////////////////////////////////////////
+
+/*!
+ * Use GR_PYTHON_BLOCKING_CODE when calling code that blocks.
+ *
+ * The try/catch is to save us from boost::thread::interrupt:
+ * If a thread from the scheduler (or any other boost thread)
+ * is blocking the routine and throws an interrupt exception.
+ */
+%{
+
+#define GR_PYTHON_BLOCKING_CODE(code) {                                 \
+    PyThreadState *_save;                                               \
+    _save = PyEval_SaveThread();                                        \
+    try{code}                                                           \
+    catch(...){PyEval_RestoreThread(_save); throw;}                     \
+    PyEval_RestoreThread(_save);                                        \
+}
+
+%}
+
+#endif /*GRUEL_COMMON_I*/
diff --git a/gruel/src/swig/pmt_swig.i b/gruel/src/swig/pmt_swig.i
index 0c937edfc..954501863 100644
--- a/gruel/src/swig/pmt_swig.i
+++ b/gruel/src/swig/pmt_swig.i
@@ -1,6 +1,6 @@
 /* -*- c++ -*- */
 /*
- * Copyright 2011 Free Software Foundation, Inc.
+ * Copyright 2011-2012 Free Software Foundation, Inc.
  * 
  * This file is part of GNU Radio
  * 
@@ -34,26 +34,13 @@
 #include <gruel/pmt.h>
 %}
 
+%include "gruel_common.i"
 //load generated python docstrings
 %include "pmt_swig_doc.i"
 
 ////////////////////////////////////////////////////////////////////////
 // Language independent exception handler
 ////////////////////////////////////////////////////////////////////////
-%include exception.i
-
-%exception {
-    try {
-        $action
-    }
-    catch(std::exception &e) {
-        SWIG_exception(SWIG_RuntimeError, e.what());
-    }
-    catch(...) {
-        SWIG_exception(SWIG_RuntimeError, "Unknown exception");
-    }
-
-}
 
 // Template intrusive_ptr for Swig to avoid dereferencing issues
 namespace pmt{