/*

 * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * 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_RUNTIME_THREADSMR_INLINE_HPP

#define SHARE_VM_RUNTIME_THREADSMR_INLINE_HPP

#include "runtime/atomic.hpp"

#include "runtime/prefetch.inline.hpp"

#include "runtime/thread.inline.hpp"

#include "runtime/threadSMR.hpp"

// Devirtualize known thread closure types.

template <class T>

inline void ThreadsList::threads_do_dispatch(T *cl, JavaThread *const thread) const {

  cl->T::do_thread(thread);

}

template <>

inline void ThreadsList::threads_do_dispatch<ThreadClosure>(ThreadClosure *cl, JavaThread *const thread) const {

  cl->do_thread(thread);

}

template <class T>

inline void ThreadsList::threads_do(T *cl) const {

  const intx scan_interval = PrefetchScanIntervalInBytes;

  JavaThread *const *const end = _threads + _length;

  for (JavaThread *const *current_p = _threads; current_p != end; current_p++) {

    Prefetch::read((void*)current_p, scan_interval);

    JavaThread *const current = *current_p;

    threads_do_dispatch(cl, current);

  }

}

// These three inlines are private to ThreadsSMRSupport, but

// they are called by public inline update_tlh_stats() below:

inline void ThreadsSMRSupport::add_tlh_times(uint add_value) {

  Atomic::add(add_value, &_tlh_times);

}

inline void ThreadsSMRSupport::inc_tlh_cnt() {

  Atomic::inc(&_tlh_cnt);

}

inline void ThreadsSMRSupport::update_tlh_time_max(uint new_value) {

  while (true) {

    uint cur_value = _tlh_time_max;

    if (new_value <= cur_value) {

      // No need to update max value so we're done.

      break;

    }

    if (Atomic::cmpxchg(new_value, &_tlh_time_max, cur_value) == cur_value) {

      // Updated max value so we're done. Otherwise try it all again.

      break;

    }

  }

}

inline ThreadsList* ThreadsSMRSupport::get_java_thread_list() {

  return (ThreadsList*)OrderAccess::load_acquire(&_java_thread_list);

}

inline bool ThreadsSMRSupport::is_a_protected_JavaThread_with_lock(JavaThread *thread) {

  MutexLockerEx ml(Threads_lock->owned_by_self() ? NULL : Threads_lock);

  return is_a_protected_JavaThread(thread);

}

inline void ThreadsSMRSupport::update_tlh_stats(uint millis) {

  ThreadsSMRSupport::inc_tlh_cnt();

  ThreadsSMRSupport::add_tlh_times(millis);

  ThreadsSMRSupport::update_tlh_time_max(millis);

}

#endif // SHARE_VM_RUNTIME_THREADSMR_INLINE_HPP