1 /* 2 * Copyright (c) 2001, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_CONCURRENTGCTHREAD_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_CONCURRENTGCTHREAD_HPP 27 28 #include "utilities/macros.hpp" 29 #include "gc_implementation/shared/suspendibleThreadSet.hpp" 30 #include "runtime/thread.hpp" 31 32 class ConcurrentGCThread: public NamedThread { 33 friend class VMStructs; 34 35 protected: 36 bool _should_terminate; 37 bool _has_terminated; 38 39 enum CGC_flag_type { 40 CGC_nil = 0x0, 41 CGC_dont_suspend = 0x1, 42 CGC_CGC_safepoint = 0x2, 43 CGC_VM_safepoint = 0x4 44 }; 45 46 static int _CGC_flag; 47 48 static bool CGC_flag_is_set(int b) { return (_CGC_flag & b) != 0; } 49 static int set_CGC_flag(int b) { return _CGC_flag |= b; } 50 static int reset_CGC_flag(int b) { return _CGC_flag &= ~b; } 51 52 // Create and start the thread (setting it's priority high.) 53 void create_and_start(); 54 55 // Do initialization steps in the thread: record stack base and size, 56 // init thread local storage, set JNI handle block. 57 void initialize_in_thread(); 58 59 // Wait until Universe::is_fully_initialized(); 60 void wait_for_universe_init(); 61 62 // Record that the current thread is terminating, and will do more 63 // concurrent work. 64 void terminate(); 65 66 public: 67 // Constructor 68 69 ConcurrentGCThread(); 70 ~ConcurrentGCThread() {} // Exists to call NamedThread destructor. 71 72 // Tester 73 bool is_ConcurrentGC_thread() const { return true; } 74 }; 75 76 // The SurrogateLockerThread is used by concurrent GC threads for 77 // manipulating Java monitors, in particular, currently for 78 // manipulating the pending_list_lock. XXX 79 class SurrogateLockerThread: public JavaThread { 80 friend class VMStructs; 81 public: 82 enum SLT_msg_type { 83 empty = 0, // no message 84 acquirePLL, // acquire pending list lock 85 releaseAndNotifyPLL // notify and release pending list lock 86 }; 87 private: 88 // the following are shared with the CMSThread 89 SLT_msg_type _buffer; // communication buffer 90 Monitor _monitor; // monitor controlling buffer 91 BasicLock _basicLock; // used for PLL locking 92 93 public: 94 static SurrogateLockerThread* make(TRAPS); 95 96 // Terminate VM with error message that SLT needed but not yet created. 97 static void report_missing_slt(); 98 99 SurrogateLockerThread(); 100 101 bool is_hidden_from_external_view() const { return true; } 102 103 void loop(); // main method 104 105 void manipulatePLL(SLT_msg_type msg); 106 107 }; 108 109 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_CONCURRENTGCTHREAD_HPP