Prevent thread creation if Join has already been called....

third_party/libjingle/files/talk/base/thread.h

 /*
  * libjingle
  * Copyright 2004--2005, Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without 
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice, 
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 117 matching lines @@
 #endif
 
 private:
   static void *PreRun(void *pv);
   void Join();
 
   std::list<_SendMessage> sendlist_;
   ThreadPriority priority_;
   CriticalSection started_crit_;
   bool started_;
+  bool stopped_;
   bool has_sends_;
 
 #ifdef POSIX
   pthread_t thread_;
 #endif
 
 #ifdef WIN32
   HANDLE thread_;
 #endif
 
   friend class ThreadManager;
 };
 
 // AutoThread automatically installs itself at construction
 // uninstalls at destruction, if a Thread object is
 // _not already_ associated with the current OS thread.
 
 class AutoThread : public Thread {
 public:
   AutoThread(SocketServer* ss = 0);
   virtual ~AutoThread();
 };
 
 } // namespace talk_base
 
 #endif // TALK_BASE_THREAD_H__