Add a warning about flow control and throttle when the fg is generated.

Because who reads the wiki anyway.



git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@10581 221aa14e-8319-0410-a670-987f0aec2ac5

2 files changed, 11 insertions, 0 deletions

diff --git a/grc/src/gui/Messages.py b/grc/src/gui/Messages.py
index e8e36f90f..e8939402d 100644
--- a/grc/src/gui/Messages.py
+++ b/grc/src/gui/Messages.py
@@ -99,3 +99,7 @@ def send_fail_load_preferences(prefs_file_path):
 
 def send_fail_save_preferences(prefs_file_path):
 	send('>>> Error: Cannot save preferences file: "%s"\n'%prefs_file_path)
+
+################# functions for warning	########################################
+def send_warning(warning):
+	send('>>> Warning: %s\n'%warning)
diff --git a/grc/src/platforms/python/Generator.py b/grc/src/platforms/python/Generator.py
index 5d3a13872..83dd186c3 100644
--- a/grc/src/platforms/python/Generator.py
+++ b/grc/src/platforms/python/Generator.py
@@ -26,6 +26,7 @@ from Constants import \
 	HIER_BLOCKS_LIB_DIR, PYEXEC, \
 	FLOW_GRAPH_TEMPLATE
 from utils import convert_hier
+from ... gui import Messages
 
 class Generator(object):
 
@@ -50,6 +51,12 @@ class Generator(object):
 	def get_file_path(self): return self._file_path
 
 	def write(self):
+		#do throttle warning
+		all_keys = ' '.join(map(lambda b: b.get_key(), self._flow_graph.get_enabled_blocks()))
+		if ('usrp' not in all_keys) and ('audio' not in all_keys) and ('throttle' not in all_keys):
+			Messages.send_warning('''\
+This flow graph may not have flow control: no audio or usrp blocks found. \
+Add a Misc->Throttle block to your flow graph to avoid CPU congestion.''')
 		#generate
 		open(self.get_file_path(), 'w').write(str(self))
 		if self._generate_options == 'hb':