/*
 * Copyright (c) 2018, Red Hat, Inc. and/or its affiliates.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHSUSPENDIBLETHREADSET_HPP
#define SHARE_VM_GC_SHENANDOAH_SHENANDOAHSUSPENDIBLETHREADSET_HPP

#include "gc_implementation/shared/suspendibleThreadSet.hpp"

class ShenandoahSuspendibleThreadSetJoiner : public StackObj {
private:
  bool _active;

public:
  ShenandoahSuspendibleThreadSetJoiner(bool active = true) : _active(active) {
    if (_active) {
      SuspendibleThreadSet::join();
    }
  }

  ~ShenandoahSuspendibleThreadSetJoiner() {
    if (_active) {
      SuspendibleThreadSet::leave();
    }
  }

  bool should_yield() {
    if (_active) {
      return SuspendibleThreadSet::should_yield();
    } else {
      return false;
    }
  }

  void yield() {
    assert(_active, "Thread has not joined the suspendible thread set");
    SuspendibleThreadSet::yield();
  }
};

class ShenandoahSuspendibleThreadSetLeaver : public StackObj {
private:
  bool _active;

public:
  ShenandoahSuspendibleThreadSetLeaver(bool active = true) : _active(active) {
    if (_active) {
      SuspendibleThreadSet::leave();
    }
  }

  ~ShenandoahSuspendibleThreadSetLeaver() {
    if (_active) {
      SuspendibleThreadSet::join();
    }
  }
};

#endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHSUSPENDIBLETHREADSET_HPP