rwlock.cc (gtm_rwlock::write_lock_generic): Fix signed/unsigned comparison werror.

        * config/posix/rwlock.cc (gtm_rwlock::write_lock_generic): Fix
        signed/unsigned comparison werror.

From-SVN: r182302

libitm/ChangeLog

 2011-12-13  Richard Henderson  <rth@redhat.com>
 
+	* config/posix/rwlock.cc (gtm_rwlock::write_lock_generic): Fix
+	signed/unsigned comparison werror.
+
 	* local_atomic: New file.
 	* libitm_i.h: Include it.
 	(gtm_thread::shared_state): Use atomic template.

libitm/config/posix/rwlock.cc

@@ -193,7 +193,7 @@ gtm_rwlock::write_lock_generic (gtm_thread *tx)
 	  it = it->next_thread)
 	{
 	  // Don't count ourself if this is an upgrade.
-	  if (it->shared_state.load(memory_order_relaxed) != -1)
+	  if (it->shared_state.load(memory_order_relaxed) != (gtm_word)-1)
 	    readers++;
 	}