Issue #4188: Avoid creating dummy thread objects when logging operations
from the threading module (with the internal verbose flag activated).
diff --git a/Lib/threading.py b/Lib/threading.py
index b6c1e5d..01c27b8 100644
--- a/Lib/threading.py
+++ b/Lib/threading.py
@@ -55,8 +55,14 @@
def _note(self, format, *args):
if self._verbose:
format = format % args
- format = "%s: %s\n" % (
- current_thread().name, format)
+ # Issue #4188: calling current_thread() can incur an infinite
+ # recursion if it has to create a DummyThread on the fly.
+ ident = _get_ident()
+ try:
+ name = _active[ident].name
+ except KeyError:
+ name = "<OS thread %d>" % ident
+ format = "%s: %s\n" % (name, format)
_sys.stderr.write(format)
else: