1 /*
   2  * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
   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/shenandoahHeap.hpp"
  27 #include "gc/shenandoah/shenandoahWorkGroup.hpp"
  28 
  29 ShenandoahWorkerScope::ShenandoahWorkerScope(WorkGang* workers, uint nworkers) :
  30   _workers(workers), _n_workers(nworkers) {
  31   ShenandoahHeap::heap()->assert_gc_workers(nworkers);
  32   _workers->update_active_workers(nworkers);
  33 }
  34 
  35 ShenandoahWorkerScope::~ShenandoahWorkerScope() {
  36   assert(_workers->active_workers() == _n_workers,
  37     "Active workers can not be changed within this scope");
  38 }
  39 
  40 ShenandoahPushWorkerScope::ShenandoahPushWorkerScope(WorkGang* workers, uint nworkers, bool check) :
  41   _workers(workers), _old_workers(workers->active_workers()), _n_workers(nworkers) {
  42   _workers->update_active_workers(nworkers);
  43 
  44   // bypass concurrent/parallel protocol check for non-regular paths, e.g. verifier, etc.
  45   if (!check) {
  46     ShenandoahHeap::heap()->assert_gc_workers(nworkers);
  47   }
  48 }
  49 
  50 ShenandoahPushWorkerScope::~ShenandoahPushWorkerScope() {
  51   assert(_workers->active_workers() == _n_workers,
  52     "Active workers can not be changed within this scope");
  53   // Restore old worker value
  54   _workers->update_active_workers(_old_workers);
  55 }
  56 
  57 AbstractGangWorker* ShenandoahWorkGang::install_worker(uint which) {
  58   AbstractGangWorker* worker = WorkGang::install_worker(which);
  59   if (_initialize_gclab) {
  60     ShenandoahHeap::heap()->initialize_gclab(worker);
  61   }
  62 
  63   return worker;
  64 }