Fix http://www.scipy.net/roundup/ipython/issue55, a threading bug. It was

easiest to trigger under win32, but the bug was actually present on all
platforms.

IPython/Shell.py

@@ -4,7 +4,7 b''
 All the matplotlib support code was co-developed with John Hunter,
 matplotlib's author.
 
-$Id: Shell.py 1079 2006-01-24 21:52:31Z vivainio $"""
+$Id: Shell.py 1297 2006-05-13 19:14:48Z fperez $"""
 
 #*****************************************************************************
 #       Copyright (C) 2001-2006 Fernando Perez <[e-mail]>
@@ -337,7 +337,7 b' class MTInteractiveShell(InteractiveShell):'
         Multithreaded wrapper around IPython's runcode()."""
 
         # lock thread-protected stuff
-        self.thread_ready.acquire(False)
+        got_lock = self.thread_ready.acquire(False)
 
         # Install sigint handler
         try:
@@ -365,6 +365,7 b' class MTInteractiveShell(InteractiveShell):'
             InteractiveShell.runcode(self,code_to_run)
             
         # We're done with thread-protected variables
+        if got_lock:
         self.thread_ready.release()
         # This MUST return true for gtk threading to work
         return True

doc/ChangeLog

@@ -1,3 +1,10 b''
[phone]  Fernando Perez  <[e-mail]>
+
+	* IPython\Shell.py (MTInteractiveShell.runsource): Fix threading
+	bug, closes http://www.scipy.net/roundup/ipython/issue55.  A lock
+	was being released in a routine which hadn't checked if it had
+	been the one to acquire it.
+
 2006-05-07  Fernando Perez  <[e-mail]>
 
 	* IPython/Release.py (version): put out 0.7.2.rc1 for testing.