author | rehn |
Fri, 29 Nov 2019 12:09:25 +0100 | |
changeset 59325 | 3636bab5e81e |
parent 58504 | 94dd00d2da29 |
child 58679 | 9c3209ff7550 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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|
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#include "precompiled.hpp" |
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#include "classfile/protectionDomainCache.hpp" |
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#include "classfile/stringTable.hpp" |
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#include "classfile/symbolTable.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "gc/shared/oopStorage.hpp" |
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#include "gc/shared/oopStorageSet.hpp" |
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#include "memory/universe.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/interfaceSupport.inline.hpp" |
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#include "runtime/javaCalls.hpp" |
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#include "runtime/jniHandles.hpp" |
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#include "runtime/serviceThread.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "runtime/os.hpp" |
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#include "prims/jvmtiImpl.hpp" |
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#include "prims/resolvedMethodTable.hpp" |
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#include "services/diagnosticArgument.hpp" |
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#include "services/diagnosticFramework.hpp" |
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#include "services/gcNotifier.hpp" |
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#include "services/lowMemoryDetector.hpp" |
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#include "services/threadIdTable.hpp" |
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ServiceThread* ServiceThread::_instance = NULL; |
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|
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void ServiceThread::initialize() { |
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EXCEPTION_MARK; |
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const char* name = "Service Thread"; |
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Handle string = java_lang_String::create_from_str(name, CHECK); |
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|
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// Initialize thread_oop to put it into the system threadGroup |
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Handle thread_group (THREAD, Universe::system_thread_group()); |
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Handle thread_oop = JavaCalls::construct_new_instance( |
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SystemDictionary::Thread_klass(), |
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vmSymbols::threadgroup_string_void_signature(), |
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thread_group, |
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string, |
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CHECK); |
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{ |
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MutexLocker mu(Threads_lock); |
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ServiceThread* thread = new ServiceThread(&service_thread_entry); |
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|
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// At this point it may be possible that no osthread was created for the |
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// JavaThread due to lack of memory. We would have to throw an exception |
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// in that case. However, since this must work and we do not allow |
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// exceptions anyway, check and abort if this fails. |
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if (thread == NULL || thread->osthread() == NULL) { |
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vm_exit_during_initialization("java.lang.OutOfMemoryError", |
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os::native_thread_creation_failed_msg()); |
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} |
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java_lang_Thread::set_thread(thread_oop(), thread); |
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java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); |
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java_lang_Thread::set_daemon(thread_oop()); |
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thread->set_threadObj(thread_oop()); |
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_instance = thread; |
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|
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Threads::add(thread); |
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Thread::start(thread); |
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} |
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} |
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static void cleanup_oopstorages() { |
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OopStorageSet::Iterator it = OopStorageSet::all_iterator(); |
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for ( ; !it.is_end(); ++it) { |
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it->delete_empty_blocks(); |
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} |
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} |
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|
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void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) { |
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while (true) { |
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bool sensors_changed = false; |
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bool has_jvmti_events = false; |
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bool has_gc_notification_event = false; |
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bool has_dcmd_notification_event = false; |
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bool stringtable_work = false; |
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bool symboltable_work = false; |
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bool resolved_method_table_work = false; |
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bool thread_id_table_work = false; |
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bool protection_domain_table_work = false; |
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bool oopstorage_work = false; |
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JvmtiDeferredEvent jvmti_event; |
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{ |
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// Need state transition ThreadBlockInVM so that this thread |
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// will be handled by safepoint correctly when this thread is |
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// notified at a safepoint. |
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// This ThreadBlockInVM object is not also considered to be |
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// suspend-equivalent because ServiceThread is not visible to |
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// external suspension. |
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ThreadBlockInVM tbivm(jt); |
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119 |
|
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MonitorLocker ml(Service_lock, Mutex::_no_safepoint_check_flag); |
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// Process all available work on each (outer) iteration, rather than |
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// only the first recognized bit of work, to avoid frequently true early |
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// tests from potentially starving later work. Hence the use of |
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// arithmetic-or to combine results; we don't want short-circuiting. |
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while (((sensors_changed = (!UseNotificationThread && LowMemoryDetector::has_pending_requests())) | |
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(has_jvmti_events = JvmtiDeferredEventQueue::has_events()) | |
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(has_gc_notification_event = (!UseNotificationThread && GCNotifier::has_event())) | |
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(has_dcmd_notification_event = (!UseNotificationThread && DCmdFactory::has_pending_jmx_notification())) | |
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(stringtable_work = StringTable::has_work()) | |
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(symboltable_work = SymbolTable::has_work()) | |
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(resolved_method_table_work = ResolvedMethodTable::has_work()) | |
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(thread_id_table_work = ThreadIdTable::has_work()) | |
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(protection_domain_table_work = SystemDictionary::pd_cache_table()->has_work()) | |
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(oopstorage_work = OopStorage::has_cleanup_work_and_reset()) |
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) == 0) { |
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// Wait until notified that there is some work to do. |
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ml.wait(); |
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} |
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139 |
|
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if (has_jvmti_events) { |
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jvmti_event = JvmtiDeferredEventQueue::dequeue(); |
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} |
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143 |
} |
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144 |
|
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145 |
if (stringtable_work) { |
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StringTable::do_concurrent_work(jt); |
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147 |
} |
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148 |
|
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149 |
if (symboltable_work) { |
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SymbolTable::do_concurrent_work(jt); |
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151 |
} |
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152 |
|
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if (has_jvmti_events) { |
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154 |
jvmti_event.post(); |
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155 |
} |
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156 |
|
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157 |
if (!UseNotificationThread) { |
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158 |
if (sensors_changed) { |
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159 |
LowMemoryDetector::process_sensor_changes(jt); |
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160 |
} |
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161 |
|
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162 |
if(has_gc_notification_event) { |
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163 |
GCNotifier::sendNotification(CHECK); |
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164 |
} |
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165 |
|
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166 |
if(has_dcmd_notification_event) { |
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167 |
DCmdFactory::send_notification(CHECK); |
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168 |
} |
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169 |
} |
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170 |
|
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171 |
if (resolved_method_table_work) { |
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172 |
ResolvedMethodTable::do_concurrent_work(jt); |
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173 |
} |
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174 |
|
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175 |
if (thread_id_table_work) { |
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176 |
ThreadIdTable::do_concurrent_work(jt); |
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177 |
} |
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178 |
|
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179 |
if (protection_domain_table_work) { |
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180 |
SystemDictionary::pd_cache_table()->unlink(); |
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181 |
} |
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182 |
|
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183 |
if (oopstorage_work) { |
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8227054: ServiceThread needs to know about all OopStorage objects
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184 |
cleanup_oopstorages(); |
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185 |
} |
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186 |
} |
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187 |
} |
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188 |
|
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189 |
bool ServiceThread::is_service_thread(Thread* thread) { |
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190 |
return thread == _instance; |
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191 |
} |