1 /* 2 * Copyright (c) 2001, 2016, 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_VM_GC_SHARED_CONCURRENTGCTHREAD_HPP 26 #define SHARE_VM_GC_SHARED_CONCURRENTGCTHREAD_HPP 27 28 #include "runtime/thread.hpp" 29 #include "utilities/macros.hpp" 30 31 class ConcurrentGCThread: public NamedThread { 32 friend class VMStructs; 33 34 protected: 35 bool volatile _should_terminate; 36 bool _has_terminated; 37 38 // Create and start the thread (setting it's priority high.) 39 void create_and_start(); 40 41 // Do initialization steps in the thread: record stack base and size, 42 // init thread local storage, set JNI handle block. 43 void initialize_in_thread(); 44 45 // Wait until Universe::is_fully_initialized(); 46 void wait_for_universe_init(); 47 48 // Record that the current thread is terminating, and will do more 49 // concurrent work. 50 void terminate(); 51 52 public: 53 ConcurrentGCThread(); 54 55 // Tester 56 bool is_ConcurrentGC_thread() const { return true; } 57 }; 58 59 // The SurrogateLockerThread is used by concurrent GC threads for 60 // manipulating Java monitors, in particular, currently for 61 // manipulating the pending_list_lock. XXX 62 class SurrogateLockerThread: public JavaThread { 63 friend class VMStructs; 64 public: 65 enum SLT_msg_type { 66 empty = 0, // no message 67 acquirePLL, // acquire pending list lock 68 releaseAndNotifyPLL // notify and release pending list lock 69 }; 70 private: 71 // the following are shared with the CMSThread 72 SLT_msg_type _buffer; // communication buffer 73 Monitor _monitor; // monitor controlling buffer 74 BasicLock _basicLock; // used for PLL locking 75 76 public: 77 static SurrogateLockerThread* make(TRAPS); 78 79 // Terminate VM with error message that SLT needed but not yet created. 80 static void report_missing_slt(); 81 82 SurrogateLockerThread(); 83 84 bool is_hidden_from_external_view() const { return true; } 85 86 void loop(); // main method 87 88 void manipulatePLL(SLT_msg_type msg); 89 90 }; 91 92 #endif // SHARE_VM_GC_SHARED_CONCURRENTGCTHREAD_HPP