* doc/globals.rdoc: $? is thread-local

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39747 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Thu Mar 14 10:01:12 2013  Eric Hodel  <drbrain@segment7.net>
+
+	* doc/globals.rdoc:  $? is thread-local
+
 Wed Mar 13 23:25:59 2013  Narihiro Nakamura  <authornari@gmail.com>
 
 	* gc.c: allow to tune growth of heap by environment variable

doc/globals.rdoc

@@ -22,7 +22,8 @@ $_::   The last input line of string by gets or readline.
 $0::   Contains the name of the script being executed. May be assignable.
 $*::   Command line arguments given for the script sans args.
 $$::   The process number of the Ruby running this script.
-$?::   The status of the last executed child process.
+$?::   The status of the last executed child process.  This value is
+       thread-local.
 $:::   Load path for scripts and binary modules by load or require.
 $"::   The array contains the module names loaded by require.
 $DEBUG::     The debug flag, which is set by the -d switch.  Enabling debug