/*

 * Copyright (c) 2012, 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.

 *

 */

#include "precompiled.hpp"

#include "jni.h"

#include "classfile/javaClasses.hpp"

#include "classfile/symbolTable.hpp"

#include "classfile/systemDictionary.hpp"

#include "jfr/jni/jfrJavaSupport.hpp"

#include "jfr/recorder/jfrRecorder.hpp"

#include "jfr/recorder/checkpoint/jfrCheckpointManager.hpp"

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

#include "memory/resourceArea.hpp"

#include "runtime/handles.inline.hpp"

#include "runtime/mutexLocker.hpp"

#include "runtime/thread.inline.hpp"

#include "utilities/preserveException.hpp"

#include "utilities/macros.hpp"

static Thread* start_thread(instanceHandle thread_oop, ThreadFunction proc, TRAPS) {

  assert(thread_oop.not_null(), "invariant");

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

  bool allocation_failed = false;

  JavaThread* new_thread = NULL;

  {

    MutexLocker mu(Threads_lock);

    new_thread = new JavaThread(proc);

    // At this point it may be possible that no

    // osthread was created for the JavaThread due to lack of memory.

    if (new_thread == NULL || new_thread->osthread() == NULL) {

      delete new_thread;

      allocation_failed = true;

    } else {

      java_lang_Thread::set_thread(thread_oop(), new_thread);

      java_lang_Thread::set_priority(thread_oop(), NormPriority);

      java_lang_Thread::set_daemon(thread_oop());

      new_thread->set_threadObj(thread_oop());

      Threads::add(new_thread);

    }

  }

  if (allocation_failed) {

    JfrJavaSupport::throw_out_of_memory_error("Unable to create native recording thread for JFR", CHECK_NULL);

  }

  Thread::start(new_thread);

  return new_thread;

}

JfrPostBox* JfrRecorderThread::_post_box = NULL;

JfrPostBox& JfrRecorderThread::post_box() {

  return *_post_box;

}

// defined in JfrRecorderThreadLoop.cpp

void recorderthread_entry(JavaThread*, Thread*);

bool JfrRecorderThread::start(JfrCheckpointManager* cp_manager, JfrPostBox* post_box, TRAPS) {

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

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

  _post_box = post_box;

  static const char klass[] = "jdk/jfr/internal/JVMUpcalls";

  static const char method[] = "createRecorderThread";

  static const char signature[] = "(Ljava/lang/ThreadGroup;Ljava/lang/ClassLoader;)Ljava/lang/Thread;";

  JavaValue result(T_OBJECT);

  JfrJavaArguments create_thread_args(&result, klass, method, signature, CHECK_false);

  // arguments

  create_thread_args.push_oop(Universe::system_thread_group());

  create_thread_args.push_oop(SystemDictionary::java_system_loader());

  JfrJavaSupport::call_static(&create_thread_args, CHECK_false);

  instanceHandle h_thread_oop(THREAD, (instanceOop)result.get_jobject());

  assert(h_thread_oop.not_null(), "invariant");

  // attempt thread start

  const Thread* const t = start_thread(h_thread_oop, recorderthread_entry,THREAD);

  if (!HAS_PENDING_EXCEPTION) {

    cp_manager->register_service_thread(t);

    return true;

  }

  assert(HAS_PENDING_EXCEPTION, "invariant");

  // Start failed, remove the thread from the system thread group

  JavaValue void_result(T_VOID);

  JfrJavaArguments remove_thread_args(&void_result);

  remove_thread_args.set_klass(SystemDictionary::ThreadGroup_klass());

  remove_thread_args.set_name(vmSymbols::remove_method_name());

  remove_thread_args.set_signature(vmSymbols::thread_void_signature());

  remove_thread_args.set_receiver(Universe::system_thread_group());

  remove_thread_args.push_oop(h_thread_oop());

  CautiouslyPreserveExceptionMark cpe(THREAD);

  JfrJavaSupport::call_special(&remove_thread_args, THREAD);

  return false;

}