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 bool volatile _should_terminate; 35 bool _has_terminated; 36 37 // Do initialization steps in the thread: record stack base and size, 38 // init thread local storage, set JNI handle block. 39 void initialize_in_thread(); 40 41 // Wait until Universe::is_fully_initialized(); 42 void wait_for_universe_init(); 43 44 // Record that the current thread is terminating, and will do more 45 // concurrent work. 46 void terminate(); 47 48 protected: 49 // Create and start the thread (setting it's priority.) 50 void create_and_start(ThreadPriority prio = NearMaxPriority); 51 52 // Do the specific GC work. Called by run() after initialization complete. 53 virtual void run_service() = 0; 54 55 // Shut down the specific GC work. Called by stop() as part of termination protocol. 56 virtual void stop_service() = 0; 57 58 public: 59 ConcurrentGCThread(); 60 61 // Tester 62 bool is_ConcurrentGC_thread() const { return true; } 63 64 virtual void run(); 65 66 // shutdown following termination protocol 67 virtual void stop(); 68 69 bool should_terminate() { return _should_terminate; } 70 bool has_terminated() { return _has_terminated; } 71 }; 72 73 // The SurrogateLockerThread is used by concurrent GC threads for 74 // manipulating Java monitors, in particular, currently for 75 // manipulating the pending_list_lock. XXX 76 class SurrogateLockerThread: public JavaThread { 77 friend class VMStructs; 78 public: 79 enum SLT_msg_type { 80 empty = 0, // no message 81 acquirePLL, // acquire pending list lock 82 releaseAndNotifyPLL // notify and release pending list lock 83 }; 84 private: 85 // the following are shared with the CMSThread 86 SLT_msg_type _buffer; // communication buffer 87 Monitor _monitor; // monitor controlling buffer 88 BasicLock _basicLock; // used for PLL locking 89 90 public: 91 static SurrogateLockerThread* make(TRAPS); 92 93 // Terminate VM with error message that SLT needed but not yet created. 94 static void report_missing_slt(); 95 96 SurrogateLockerThread(); 97 98 bool is_hidden_from_external_view() const { return true; } 99 100 void loop(); // main method 101 102 void manipulatePLL(SLT_msg_type msg); 103 104 }; 105 106 #endif // SHARE_VM_GC_SHARED_CONCURRENTGCTHREAD_HPP