1 /*
   2  * Copyright (c) 2017, 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_implementation/shenandoah/shenandoahHeap.inline.hpp"
  27 #include "gc_implementation/shenandoah/shenandoahWorkGroup.hpp"
  28 #include "gc_implementation/shenandoah/shenandoahLogging.hpp"
  29 
  30 ShenandoahWorkerScope::ShenandoahWorkerScope(ShenandoahWorkGang* workers, uint nworkers, const char* msg, bool check) :
  31   _n_workers(nworkers),
  32   _workers(workers) {
  33   assert(msg != NULL, "Missing message");
  34   log_info(gc, task)("Using %u of %u workers for %s",
  35                      nworkers, ShenandoahHeap::heap()->max_workers(), msg);
  36 
  37   if (check) {
  38     ShenandoahHeap::heap()->assert_gc_workers(nworkers);
  39   }
  40   _workers->set_active_workers(nworkers);
  41 }
  42 
  43 ShenandoahWorkerScope::~ShenandoahWorkerScope() {
  44   assert(_workers->active_workers() == _n_workers,
  45     "Active workers can not be changed within this scope");
  46 }
  47 
  48 ShenandoahPushWorkerScope::ShenandoahPushWorkerScope(ShenandoahWorkGang* workers, uint nworkers, bool check) :
  49   _n_workers(nworkers),
  50   _old_workers(workers->active_workers()),
  51   _workers(workers) {
  52   _workers->set_active_workers(nworkers);
  53 
  54   // bypass concurrent/parallel protocol check for non-regular paths, e.g. verifier, etc.
  55   if (check) {
  56     ShenandoahHeap::heap()->assert_gc_workers(nworkers);
  57   }
  58 }
  59 
  60 ShenandoahPushWorkerScope::~ShenandoahPushWorkerScope() {
  61   assert(_workers->active_workers() == _n_workers,
  62     "Active workers can not be changed within this scope");
  63   // Restore old worker value
  64   _workers->set_active_workers(_old_workers);
  65 }