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annotate src/share/vm/runtime/serviceThread.cpp @ 3356:78542e2b5e35

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7036199: Adding a notification to the implementation of GarbageCollectorMXBeans Summary: Add a notification to the GarbageCollectorMXBeans Reviewed-by: acorn, mchung
author fparain
date Thu, 12 May 2011 10:30:11 -0700
parents 216d916d5c12
children 31a4e55f8c9d
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "runtime/interfaceSupport.hpp"
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27 #include "runtime/javaCalls.hpp"
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28 #include "runtime/serviceThread.hpp"
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29 #include "runtime/mutexLocker.hpp"
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30 #include "prims/jvmtiImpl.hpp"
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31 #include "services/gcNotifier.hpp"
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32
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33 ServiceThread* ServiceThread::_instance = NULL;
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34
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35 void ServiceThread::initialize() {
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36 EXCEPTION_MARK;
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37
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38 instanceKlassHandle klass (THREAD, SystemDictionary::Thread_klass());
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39 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
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40
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41 const char* name = JDK_Version::is_gte_jdk17x_version() ?
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42 "Service Thread" : "Low Memory Detector";
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43
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44 Handle string = java_lang_String::create_from_str(name, CHECK);
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45
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46 // Initialize thread_oop to put it into the system threadGroup
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47 Handle thread_group (THREAD, Universe::system_thread_group());
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48 JavaValue result(T_VOID);
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49 JavaCalls::call_special(&result, thread_oop,
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50 klass,
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51 vmSymbols::object_initializer_name(),
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52 vmSymbols::threadgroup_string_void_signature(),
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53 thread_group,
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54 string,
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55 CHECK);
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56
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57 {
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58 MutexLocker mu(Threads_lock);
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59 ServiceThread* thread = new ServiceThread(&service_thread_entry);
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60
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61 // At this point it may be possible that no osthread was created for the
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62 // JavaThread due to lack of memory. We would have to throw an exception
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63 // in that case. However, since this must work and we do not allow
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64 // exceptions anyway, check and abort if this fails.
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65 if (thread == NULL || thread->osthread() == NULL) {
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66 vm_exit_during_initialization("java.lang.OutOfMemoryError",
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67 "unable to create new native thread");
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68 }
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69
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70 java_lang_Thread::set_thread(thread_oop(), thread);
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71 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
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72 java_lang_Thread::set_daemon(thread_oop());
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73 thread->set_threadObj(thread_oop());
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74 _instance = thread;
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75
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76 Threads::add(thread);
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77 Thread::start(thread);
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78 }
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79 }
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80
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81 void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) {
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82 while (true) {
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83 bool sensors_changed = false;
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84 bool has_jvmti_events = false;
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85 bool has_gc_notification_event = false;
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86 JvmtiDeferredEvent jvmti_event;
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87 {
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88 // Need state transition ThreadBlockInVM so that this thread
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89 // will be handled by safepoint correctly when this thread is
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90 // notified at a safepoint.
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91
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92 // This ThreadBlockInVM object is not also considered to be
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93 // suspend-equivalent because ServiceThread is not visible to
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94 // external suspension.
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95
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96 ThreadBlockInVM tbivm(jt);
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97
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98 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
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99 while (!(sensors_changed = LowMemoryDetector::has_pending_requests()) &&
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100 !(has_jvmti_events = JvmtiDeferredEventQueue::has_events()) &&
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101 !(has_gc_notification_event = GCNotifier::has_event())) {
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102 // wait until one of the sensors has pending requests, or there is a
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103 // pending JVMTI event or JMX GC notification to post
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104 Service_lock->wait(Mutex::_no_safepoint_check_flag);
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105 }
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106
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107 if (has_jvmti_events) {
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108 jvmti_event = JvmtiDeferredEventQueue::dequeue();
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109 }
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110 }
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111
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112 if (has_jvmti_events) {
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113 jvmti_event.post();
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114 }
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115
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116 if (sensors_changed) {
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117 LowMemoryDetector::process_sensor_changes(jt);
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118 }
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119
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120 if(has_gc_notification_event) {
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121 GCNotifier::sendNotification(CHECK);
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122 }
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123 }
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124 }
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125
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126 bool ServiceThread::is_service_thread(Thread* thread) {
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127 return thread == _instance;
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128 }