1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #include "precompiled.hpp"
  25 
  26 #include "gc/shenandoah/shenandoahSATBMarkQueueSet.hpp"
  27 #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
  28 
  29 SATBMarkQueue& ShenandoahSATBMarkQueueSet::satb_queue_for_thread(Thread* t) {
  30   return ShenandoahThreadLocalData::satb_mark_queue(t);
  31 }
  32 
  33 bool ShenandoahSATBMarkQueue::should_enqueue_buffer() {
  34   bool should_enqueue = SATBMarkQueue::should_enqueue_buffer();
  35   size_t cap = capacity();
  36   Thread* t = Thread::current();
  37   if (ShenandoahThreadLocalData::is_force_satb_flush(t)) {
  38     if (!should_enqueue && cap != index()) {
  39       // Non-empty buffer is compacted, and we decided not to enqueue it.
  40       // We still want to know about leftover work in that buffer eventually.
  41       // This avoid dealing with these leftovers during the final-mark, after
  42       // the buffers are drained completely. See JDK-8205353 for more discussion.
  43       should_enqueue = true;
  44     }
  45     ShenandoahThreadLocalData::set_force_satb_flush(t, false);
  46   }
  47   return should_enqueue;
  48 }