1 /*
   2  * Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 # include "incls/_precompiled.incl"
  26 # include "incls/_lowMemoryDetector.cpp.incl"









  27 
  28 LowMemoryDetectorThread* LowMemoryDetector::_detector_thread = NULL;
  29 volatile bool LowMemoryDetector::_enabled_for_collected_pools = false;
  30 volatile jint LowMemoryDetector::_disabled_count = 0;
  31 
  32 void LowMemoryDetector::initialize() {
  33   EXCEPTION_MARK;
  34 
  35   instanceKlassHandle klass (THREAD,  SystemDictionary::Thread_klass());
  36   instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
  37 
  38   const char thread_name[] = "Low Memory Detector";
  39   Handle string = java_lang_String::create_from_str(thread_name, CHECK);
  40 
  41   // Initialize thread_oop to put it into the system threadGroup
  42   Handle thread_group (THREAD, Universe::system_thread_group());
  43   JavaValue result(T_VOID);
  44   JavaCalls::call_special(&result, thread_oop,
  45                           klass,
  46                           vmSymbolHandles::object_initializer_name(),

   1 /*
   2  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/systemDictionary.hpp"
  27 #include "classfile/vmSymbols.hpp"
  28 #include "oops/oop.inline.hpp"
  29 #include "runtime/interfaceSupport.hpp"
  30 #include "runtime/java.hpp"
  31 #include "runtime/javaCalls.hpp"
  32 #include "runtime/mutex.hpp"
  33 #include "runtime/mutexLocker.hpp"
  34 #include "services/lowMemoryDetector.hpp"
  35 #include "services/management.hpp"
  36 
  37 LowMemoryDetectorThread* LowMemoryDetector::_detector_thread = NULL;
  38 volatile bool LowMemoryDetector::_enabled_for_collected_pools = false;
  39 volatile jint LowMemoryDetector::_disabled_count = 0;
  40 
  41 void LowMemoryDetector::initialize() {
  42   EXCEPTION_MARK;
  43 
  44   instanceKlassHandle klass (THREAD,  SystemDictionary::Thread_klass());
  45   instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
  46 
  47   const char thread_name[] = "Low Memory Detector";
  48   Handle string = java_lang_String::create_from_str(thread_name, CHECK);
  49 
  50   // Initialize thread_oop to put it into the system threadGroup
  51   Handle thread_group (THREAD, Universe::system_thread_group());
  52   JavaValue result(T_VOID);
  53   JavaCalls::call_special(&result, thread_oop,
  54                           klass,
  55                           vmSymbolHandles::object_initializer_name(),