Changes to LLThread

* Call a virtual terminated() that by default sets mStatus to STOPPED,
  instead of setting it to STOPPED directly, allowing to override
  the behavior of a LLThread derived class when the thread is about
  the exit.
* Make setQuitting() public, so it can also be used to hint to a
  thread that it should stop at its earliest convience.

indra/llcommon/llthread.cpp

@@ -109,7 +109,7 @@ void *APR_THREAD_FUNC LLThread::staticRun(apr_thread_t *apr_threadp, void *datap
 	--sRunning;
 
 	// We're done with the run function, this thread is done executing now.
-	threadp->mStatus = STOPPED;
+	threadp->terminated();
 
 	// Only now print this info [doing that before setting mStatus
 	// to STOPPED makes it much more likely that another thread runs

indra/llcommon/llthread.h

@@ -128,6 +128,9 @@ public:
 	// this kicks off the apr thread
 	void start(void);
 
+	// Can be used to tell the thread we're not interested anymore and it should abort.
+	void setQuitting();
+	
 	// Return thread-local data for the current thread.
 	static LLThreadLocalData& tldata(void) { return LLThreadLocalData::tldata(); }
 
@@ -147,11 +150,12 @@ protected:
 	friend void LLThreadLocalData::create(LLThread* threadp);
 	LLThreadLocalData*  mThreadLocalData;
 
-	void setQuitting();
-	
 	// virtual function overridden by subclass -- this will be called when the thread runs
 	virtual void run(void) = 0; 
 	
+	// This class is completely done (called from THREAD!).
+	virtual void terminated(void) { mStatus = STOPPED; }
+
 	// virtual predicate function -- returns true if the thread should wake up, false if it should sleep.
 	virtual bool runCondition(void);