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products/sources/formale Sprachen/Java/Openjdk/src/hotspot/share/runtime/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 2 kB

Quelle monitorDeflationThread.cpp Sprache: C

/*
* Copyright (c) 2020, 2022, 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 "classfile/vmSymbols.hpp"
#include "memory/universe.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/java.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/monitorDeflationThread.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/synchronizer.hpp"

void MonitorDeflationThread::initialize() {
  EXCEPTION_MARK;

  const char* name = "Monitor Deflation Thread";
  Handle thread_oop = JavaThread::create_system_thread_object(name, false /* not visible */, CHECK);

  MonitorDeflationThread* thread = new MonitorDeflationThread(&monitor_deflation_thread_entry);
  JavaThread::vm_exit_on_osthread_failure(thread);

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

void MonitorDeflationThread::monitor_deflation_thread_entry(JavaThread* jt, TRAPS) {
  while (true) {
    {
      // 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(MonitorDeflation_lock, Mutex::_no_safepoint_check_flag);
      while (!ObjectSynchronizer::is_async_deflation_needed()) {
        // Wait until notified that there is some work to do.
        // We wait for GuaranteedSafepointInterval so that
        // is_async_deflation_needed() is checked at the same interval.
        ml.wait(GuaranteedSafepointInterval);
      }
    }

    (void)ObjectSynchronizer::deflate_idle_monitors(/* ObjectMonitorsHashtable is not needed here */ nullptr);
  }
}

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