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comparison: src/share/vm/runtime/serviceThread.cpp
src/share/vm/runtime/serviceThread.cpp
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| 1 /* | |
| 2 * Copyright (c) 2012, 2013, 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 "runtime/interfaceSupport.hpp" | |
| 27 #include "runtime/javaCalls.hpp" | |
| 28 #include "runtime/serviceThread.hpp" | |
| 29 #include "runtime/mutexLocker.hpp" | |
| 30 #include "prims/jvmtiImpl.hpp" | |
| 31 #include "services/gcNotifier.hpp" | |
| 32 #include "services/diagnosticArgument.hpp" | |
| 33 #include "services/diagnosticFramework.hpp" | |
| 34 | |
| 35 ServiceThread* ServiceThread::_instance = NULL; | |
| 36 | |
| 37 void ServiceThread::initialize() { | |
| 38 EXCEPTION_MARK; | |
| 39 | |
| 40 instanceKlassHandle klass (THREAD, SystemDictionary::Thread_klass()); | |
| 41 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 42 | |
| 43 const char* name = JDK_Version::is_gte_jdk17x_version() ? | |
| 44 "Service Thread" : "Low Memory Detector"; | |
| 45 | |
| 46 Handle string = java_lang_String::create_from_str(name, CHECK); | |
| 47 | |
| 48 // Initialize thread_oop to put it into the system threadGroup | |
| 49 Handle thread_group (THREAD, Universe::system_thread_group()); | |
| 50 JavaValue result(T_VOID); | |
| 51 JavaCalls::call_special(&result, thread_oop, | |
| 52 klass, | |
| 53 vmSymbols::object_initializer_name(), | |
| 54 vmSymbols::threadgroup_string_void_signature(), | |
| 55 thread_group, | |
| 56 string, | |
| 57 CHECK); | |
| 58 | |
| 59 { | |
| 60 MutexLocker mu(Threads_lock); | |
| 61 ServiceThread* thread = new ServiceThread(&service_thread_entry); | |
| 62 | |
| 63 // At this point it may be possible that no osthread was created for the | |
| 64 // JavaThread due to lack of memory. We would have to throw an exception | |
| 65 // in that case. However, since this must work and we do not allow | |
| 66 // exceptions anyway, check and abort if this fails. | |
| 67 if (thread == NULL || thread->osthread() == NULL) { | |
| 68 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
| 69 "unable to create new native thread"); | |
| 70 } | |
| 71 | |
| 72 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 73 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
| 74 java_lang_Thread::set_daemon(thread_oop()); | |
| 75 thread->set_threadObj(thread_oop()); | |
| 76 _instance = thread; | |
| 77 | |
| 78 Threads::add(thread); | |
| 79 Thread::start(thread); | |
| 80 } | |
| 81 } | |
| 82 | |
| 83 void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) { | |
| 84 while (true) { | |
| 85 bool sensors_changed = false; | |
| 86 bool has_jvmti_events = false; | |
| 87 bool has_gc_notification_event = false; | |
| 88 bool has_dcmd_notification_event = false; | |
| 89 JvmtiDeferredEvent jvmti_event; | |
| 90 { | |
| 91 // Need state transition ThreadBlockInVM so that this thread | |
| 92 // will be handled by safepoint correctly when this thread is | |
| 93 // notified at a safepoint. | |
| 94 | |
| 95 // This ThreadBlockInVM object is not also considered to be | |
| 96 // suspend-equivalent because ServiceThread is not visible to | |
| 97 // external suspension. | |
| 98 | |
| 99 ThreadBlockInVM tbivm(jt); | |
| 100 | |
| 101 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); | |
| 102 while (!(sensors_changed = LowMemoryDetector::has_pending_requests()) && | |
| 103 !(has_jvmti_events = JvmtiDeferredEventQueue::has_events()) && | |
| 104 !(has_gc_notification_event = GCNotifier::has_event()) && | |
| 105 !(has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification())) { | |
| 106 // wait until one of the sensors has pending requests, or there is a | |
| 107 // pending JVMTI event or JMX GC notification to post | |
| 108 Service_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 109 } | |
| 110 | |
| 111 if (has_jvmti_events) { | |
| 112 jvmti_event = JvmtiDeferredEventQueue::dequeue(); | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 if (has_jvmti_events) { | |
| 117 jvmti_event.post(); | |
| 118 } | |
| 119 | |
| 120 if (sensors_changed) { | |
| 121 LowMemoryDetector::process_sensor_changes(jt); | |
| 122 } | |
| 123 | |
| 124 if(has_gc_notification_event) { | |
| 125 GCNotifier::sendNotification(CHECK); | |
| 126 } | |
| 127 | |
| 128 if(has_dcmd_notification_event) { | |
| 129 DCmdFactory::send_notification(CHECK); | |
| 130 } | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 bool ServiceThread::is_service_thread(Thread* thread) { | |
| 135 return thread == _instance; | |
| 136 } |
