Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/serviceThread.cpp @ 8504:86b4965f0c9a
-Cleanup code
author | Christos Kotselidis <christos.kotselidis@oracle.com> |
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date | Wed, 20 Mar 2013 21:39:24 +0100 |
parents | 78542e2b5e35 |
children | 31a4e55f8c9d |
rev | line source |
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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 } |