Quelle notificationThread.cpp Sprache: C

/*
* Copyright (c) 2019, 2021, 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 "classfile/javaClasses.hpp"
#include "classfile/vmClasses.hpp"
#include "memory/universe.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/java.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/notificationThread.hpp"
#include "services/diagnosticArgument.hpp"
#include "services/diagnosticFramework.hpp"
#include "services/gcNotifier.hpp"
#include "services/lowMemoryDetector.hpp"

void NotificationThread::initialize() {
  EXCEPTION_MARK;

  const char* name = "Notification Thread";
  Handle thread_oop = JavaThread::create_system_thread_object(name, true /* visible */, CHECK);

   NotificationThread* thread = new NotificationThread(¬ification_thread_entry);
   JavaThread::vm_exit_on_osthread_failure(thread);

   JavaThread::start_internal_daemon(THREAD, thread, thread_oop, NearMaxPriority);
}

void NotificationThread::notification_thread_entry(JavaThread* jt, TRAPS) {
  while (true) {
    bool sensors_changed = false;
    bool has_dcmd_notification_event = false;
    bool has_gc_notification_event = false;
    {
      // Need state transition ThreadBlockInVM so that this thread
      // will be handled by safepoint correctly when this thread is
      // notified at a safepoint.

      ThreadBlockInVM tbivm(jt);

      MonitorLocker ml(Notification_lock, Mutex::_no_safepoint_check_flag);
      // Process all available work on each (outer) iteration, rather than
      // only the first recognized bit of work, to avoid frequently true early
      // tests from potentially starving later work.  Hence the use of
      // arithmetic-or to combine results; we don't want short-circuiting.
      while (((sensors_changed = LowMemoryDetector::has_pending_requests()) |
              (has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) |
              (has_gc_notification_event = GCNotifier::has_event()))
             == 0) {
        // Wait until notified that there is some work to do.
        ml.wait(0);
      }

    }

    if (sensors_changed) {
      LowMemoryDetector::process_sensor_changes(jt);
    }

    if(has_gc_notification_event) {
      GCNotifier::sendNotification(CHECK);
    }

    if(has_dcmd_notification_event) {
      DCmdFactory::send_notification(CHECK);
    }

  }
}

quality78%

¤ Dauer der Verarbeitung: 0.11 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.