1 /* 2 * Copyright (c) 2011, 2019, 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 #ifndef SHARE_RUNTIME_SERVICETHREAD_HPP 26 #define SHARE_RUNTIME_SERVICETHREAD_HPP 27 28 #include "runtime/thread.hpp" 29 30 // A JavaThread for low memory detection support and JVMTI 31 // compiled-method-load events. 32 class ServiceThread : public JavaThread { 33 friend class VMStructs; 34 private: 35 36 static ServiceThread* _instance; 37 38 static void service_thread_entry(JavaThread* thread, TRAPS); 39 ServiceThread(ThreadFunction entry_point) : JavaThread(entry_point) {}; 40 41 public: 42 static void initialize(); 43 44 // Hide this thread from external view. 45 bool is_hidden_from_external_view() const { return true; } 46 47 // Returns true if the passed thread is the service thread. 48 static bool is_service_thread(Thread* thread); 49 }; 50 51 #endif // SHARE_RUNTIME_SERVICETHREAD_HPP