execnet-patches / linecache

# HG changeset patch
# Parent da6994ca8402d9d29a367ed312cce0717ea46dad
protect linecache.updatecache with a threading.Lock, fixes #5

diff --git a/execnet/gateway.py b/execnet/gateway.py
--- a/execnet/gateway.py
+++ b/execnet/gateway.py
@@ -6,10 +6,19 @@ gateway code for initiating popen, socke
 import sys, os, inspect, types, linecache
 import textwrap
 import execnet
-from execnet.gateway_base import Message, Popen2IO, serialize
+from execnet.gateway_base import Message, Popen2IO, serialize, threading
 from execnet import gateway_base
 importdir = os.path.dirname(os.path.dirname(execnet.__file__))
+linecache_lock = threading.Lock()
+def linecache_updatecache(filename):
+    linecache_lock.acquire()
+    try:
+        linecache.updatecache(filename)
+    finally:
+        linecache_lock.release()
 class Gateway(gateway_base.BaseGateway):
     """ Gateway to a local or remote Python Intepreter. """
@@ -110,7 +119,7 @@ class Gateway(gateway_base.BaseGateway):
         call_name = None
         if isinstance(source, types.ModuleType):
-            linecache.updatecache(inspect.getsourcefile(source))
+            linecache_updatecache(inspect.getsourcefile(source))
             source = inspect.getsource(source)
         elif isinstance(source, types.FunctionType):
             call_name = source.__name__
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