/*

 * Copyright (c) 2012, 2019, 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 "jfr/recorder/jfrRecorder.hpp"

#include "jfr/recorder/service/jfrPostBox.hpp"

#include "jfr/recorder/service/jfrRecorderService.hpp"

#include "jfr/recorder/service/jfrRecorderThread.hpp"

#include "logging/log.hpp"

#include "runtime/mutexLocker.hpp"

#include "runtime/thread.inline.hpp"

//

// Entry point for "JFR Recorder Thread" message loop.

// The recorder thread executes service requests collected from the message system.

//

void recorderthread_entry(JavaThread* thread, Thread* unused) {

  assert(thread != NULL, "invariant");

  #define START (msgs & (MSGBIT(MSG_START)))

  #define SHUTDOWN (msgs & MSGBIT(MSG_SHUTDOWN))

  #define ROTATE (msgs & (MSGBIT(MSG_ROTATE)|MSGBIT(MSG_STOP)))

  #define PROCESS_FULL_BUFFERS (msgs & (MSGBIT(MSG_ROTATE)|MSGBIT(MSG_STOP)|MSGBIT(MSG_FULLBUFFER)))

  #define SCAVENGE (msgs & (MSGBIT(MSG_DEADBUFFER)))

  JfrPostBox& post_box = JfrRecorderThread::post_box();

  log_debug(jfr, system)("Recorder thread STARTED");

  {

    bool done = false;

    int msgs = 0;

    JfrRecorderService service;

    MutexLocker msg_lock(JfrMsg_lock);

    // JFR MESSAGE LOOP PROCESSING - BEGIN

    while (!done) {

      if (post_box.is_empty()) {

        JfrMsg_lock->wait();

      }

      msgs = post_box.collect();

      JfrMsg_lock->unlock();

      if (PROCESS_FULL_BUFFERS) {

        service.process_full_buffers();

      }

      if (SCAVENGE) {

        service.scavenge();

      }

      // Check amount of data written to chunk already

      // if it warrants asking for a new chunk

      service.evaluate_chunk_size_for_rotation();

      if (START) {

        service.start();

      } else if (ROTATE) {

        service.rotate(msgs);

      }

      JfrMsg_lock->lock();

      post_box.notify_waiters();

      if (SHUTDOWN) {

        log_debug(jfr, system)("Request to STOP recorder");

        done = true;

      }

    } // JFR MESSAGE LOOP PROCESSING - END

  } // JfrMsg_lock scope

  assert(!JfrMsg_lock->owned_by_self(), "invariant");

  post_box.notify_collection_stop();

  JfrRecorder::on_recorder_thread_exit();

  #undef START

  #undef SHUTDOWN

  #undef ROTATE

  #undef PROCESS_FULL_BUFFERS

  #undef SCAVENGE

}