libitm: Don't enforce privatization safety if already in serial mode.

	libitm/
	* beginend.cc (GTM::gtm_thread::trycommit): Don't enforce
	privatization safety if already in serial mode.

From-SVN: r182676

libitm/ChangeLog

 2011-12-24  Torvald Riegel  <triegel@redhat.com>
 
+	* beginend.cc (GTM::gtm_thread::trycommit): Don't enforce
+	privatization safety if already in serial mode.
+
+2011-12-24  Torvald Riegel  <triegel@redhat.com>
+
 	* beginend.cc (GTM::gtm_thread::restart): Add and handle
 	finish_serial_upgrade parameter.
 	* libitm.h (GTM::gtm_thread::restart): Adapt declaration.

libitm/beginend.cc

@@ -457,7 +457,12 @@ GTM::gtm_thread::trycommit ()
       // The transaction is now inactive. Everything that we still have to do
       // will not synchronize with other transactions anymore.
       if (state & gtm_thread::STATE_SERIAL)
-	gtm_thread::serial_lock.write_unlock ();
+        {
+          gtm_thread::serial_lock.write_unlock ();
+          // There are no other active transactions, so there's no need to
+          // enforce privatization safety.
+          priv_time = 0;
+        }
       else
 	gtm_thread::serial_lock.read_unlock (this);
       state = 0;