/*

 * Copyright (c) 2014, 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.

 *

 */

#include "precompiled.hpp"

#include "gc_implementation/g1/g1Log.hpp"

#include "gc_implementation/g1/g1StringDedup.hpp"

#include "gc_implementation/g1/g1StringDedupTable.hpp"

#include "gc_implementation/g1/g1StringDedupThread.hpp"

#include "gc_implementation/g1/g1StringDedupQueue.hpp"

G1StringDedupThread* G1StringDedupThread::_thread = NULL;

G1StringDedupThread::G1StringDedupThread() :

  ConcurrentGCThread() {

  set_name("String Deduplication Thread");

  create_and_start();

}

G1StringDedupThread::~G1StringDedupThread() {

  ShouldNotReachHere();

}

void G1StringDedupThread::create() {

  assert(G1StringDedup::is_enabled(), "String deduplication not enabled");

  assert(_thread == NULL, "One string deduplication thread allowed");

  _thread = new G1StringDedupThread();

}

G1StringDedupThread* G1StringDedupThread::thread() {

  assert(G1StringDedup::is_enabled(), "String deduplication not enabled");

  assert(_thread != NULL, "String deduplication thread not created");

  return _thread;

}

void G1StringDedupThread::print_on(outputStream* st) const {

  st->print("\"%s\" ", name());

  Thread::print_on(st);

  st->cr();

}

void G1StringDedupThread::run() {

  G1StringDedupStat total_stat;

  initialize_in_thread();

  wait_for_universe_init();

  // Main loop

  for (;;) {

    G1StringDedupStat stat;

    stat.mark_idle();

    // Wait for the queue to become non-empty

    G1StringDedupQueue::wait();

    // Include this thread in safepoints

    stsJoin();

    stat.mark_exec();

    // Process the queue

    for (;;) {

      oop java_string = G1StringDedupQueue::pop();

      if (java_string == NULL) {

        break;

      }

      G1StringDedupTable::deduplicate(java_string, stat);

      // Safepoint this thread if needed

      if (stsShouldYield()) {

        stat.mark_block();

        stsYield(NULL);

        stat.mark_unblock();

      }

    }

    G1StringDedupTable::trim_entry_cache();

    stat.mark_done();

    // Print statistics

    total_stat.add(stat);

    print(gclog_or_tty, stat, total_stat);

    // Exclude this thread from safepoints

    stsLeave();

  }

  ShouldNotReachHere();

}

void G1StringDedupThread::print(outputStream* st, const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat) {

  if (G1Log::fine() || PrintStringDeduplicationStatistics) {

    G1StringDedupStat::print_summary(st, last_stat, total_stat);

    if (PrintStringDeduplicationStatistics) {

      G1StringDedupStat::print_statistics(st, last_stat, false);

      G1StringDedupStat::print_statistics(st, total_stat, true);

      G1StringDedupTable::print_statistics(st);

      G1StringDedupQueue::print_statistics(st);

    }

  }

}