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