Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/concurrentGCThread.hpp @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children | 7848fc12602b |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 17524 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_CONCURRENTGCTHREAD_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_CONCURRENTGCTHREAD_HPP | |
| 27 | |
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28 #include "utilities/macros.hpp" |
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29 #if INCLUDE_ALL_GCS |
| 1972 | 30 #include "runtime/thread.hpp" |
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31 #endif // INCLUDE_ALL_GCS |
| 1972 | 32 |
| 342 | 33 class VoidClosure; |
| 34 | |
| 35 // A SuspendibleThreadSet is (obviously) a set of threads that can be | |
| 36 // suspended. A thread can join and later leave the set, and periodically | |
| 37 // yield. If some thread (not in the set) requests, via suspend_all, that | |
| 38 // the threads be suspended, then the requesting thread is blocked until | |
| 39 // all the threads in the set have yielded or left the set. (Threads may | |
| 40 // not enter the set when an attempted suspension is in progress.) The | |
| 41 // suspending thread later calls resume_all, allowing the suspended threads | |
| 42 // to continue. | |
| 43 | |
| 44 class SuspendibleThreadSet { | |
| 45 Monitor* _m; | |
| 46 int _async; | |
| 47 bool _async_stop; | |
| 48 int _async_stopped; | |
| 49 bool _initialized; | |
| 50 double _suspend_all_start; | |
| 51 | |
| 52 void initialize_work(); | |
| 53 | |
| 54 public: | |
| 55 SuspendibleThreadSet() : _initialized(false) {} | |
| 56 | |
| 57 // Add the current thread to the set. May block if a suspension | |
| 58 // is in progress. | |
| 59 void join(); | |
| 60 // Removes the current thread from the set. | |
| 61 void leave(); | |
| 62 // Returns "true" iff an suspension is in progress. | |
| 63 bool should_yield() { return _async_stop; } | |
| 64 // Suspends the current thread if a suspension is in progress (for | |
| 65 // the duration of the suspension.) | |
| 66 void yield(const char* id); | |
| 67 // Return when all threads in the set are suspended. | |
| 68 void suspend_all(); | |
| 69 // Allow suspended threads to resume. | |
| 70 void resume_all(); | |
| 71 // Redundant initializations okay. | |
| 72 void initialize() { | |
| 73 // Double-check dirty read idiom. | |
| 74 if (!_initialized) initialize_work(); | |
| 75 } | |
| 76 }; | |
| 77 | |
| 78 | |
| 79 class ConcurrentGCThread: public NamedThread { | |
| 80 friend class VMStructs; | |
| 81 | |
| 82 protected: | |
| 794 | 83 bool _should_terminate; |
| 84 bool _has_terminated; | |
| 342 | 85 |
| 86 enum CGC_flag_type { | |
| 87 CGC_nil = 0x0, | |
| 88 CGC_dont_suspend = 0x1, | |
| 89 CGC_CGC_safepoint = 0x2, | |
| 90 CGC_VM_safepoint = 0x4 | |
| 91 }; | |
| 92 | |
| 93 static int _CGC_flag; | |
| 94 | |
| 95 static bool CGC_flag_is_set(int b) { return (_CGC_flag & b) != 0; } | |
| 96 static int set_CGC_flag(int b) { return _CGC_flag |= b; } | |
| 97 static int reset_CGC_flag(int b) { return _CGC_flag &= ~b; } | |
| 98 | |
| 99 // All instances share this one set. | |
| 100 static SuspendibleThreadSet _sts; | |
| 101 | |
| 102 // Create and start the thread (setting it's priority high.) | |
| 103 void create_and_start(); | |
| 104 | |
| 105 // Do initialization steps in the thread: record stack base and size, | |
| 106 // init thread local storage, set JNI handle block. | |
| 107 void initialize_in_thread(); | |
| 108 | |
| 109 // Wait until Universe::is_fully_initialized(); | |
| 110 void wait_for_universe_init(); | |
| 111 | |
| 112 // Record that the current thread is terminating, and will do more | |
| 113 // concurrent work. | |
| 114 void terminate(); | |
| 115 | |
| 116 public: | |
| 117 // Constructor | |
| 118 | |
| 119 ConcurrentGCThread(); | |
| 120 ~ConcurrentGCThread() {} // Exists to call NamedThread destructor. | |
| 121 | |
| 122 // Tester | |
| 123 bool is_ConcurrentGC_thread() const { return true; } | |
| 124 | |
| 125 static void safepoint_synchronize(); | |
| 126 static void safepoint_desynchronize(); | |
| 127 | |
| 128 // All overridings should probably do _sts::yield, but we allow | |
| 129 // overriding for distinguished debugging messages. Default is to do | |
| 130 // nothing. | |
| 131 virtual void yield() {} | |
| 132 | |
| 133 bool should_yield() { return _sts.should_yield(); } | |
| 134 | |
| 135 // they are prefixed by sts since there are already yield() and | |
| 136 // should_yield() (non-static) methods in this class and it was an | |
| 137 // easy way to differentiate them. | |
| 138 static void stsYield(const char* id); | |
| 139 static bool stsShouldYield(); | |
| 140 static void stsJoin(); | |
| 141 static void stsLeave(); | |
| 142 | |
| 143 }; | |
| 144 | |
| 145 // The SurrogateLockerThread is used by concurrent GC threads for | |
| 146 // manipulating Java monitors, in particular, currently for | |
| 147 // manipulating the pending_list_lock. XXX | |
| 148 class SurrogateLockerThread: public JavaThread { | |
| 149 friend class VMStructs; | |
| 150 public: | |
| 151 enum SLT_msg_type { | |
| 152 empty = 0, // no message | |
| 153 acquirePLL, // acquire pending list lock | |
| 154 releaseAndNotifyPLL // notify and release pending list lock | |
| 155 }; | |
| 156 private: | |
| 157 // the following are shared with the CMSThread | |
| 158 SLT_msg_type _buffer; // communication buffer | |
| 159 Monitor _monitor; // monitor controlling buffer | |
| 160 BasicLock _basicLock; // used for PLL locking | |
| 161 | |
| 162 public: | |
| 163 static SurrogateLockerThread* make(TRAPS); | |
| 164 | |
| 165 SurrogateLockerThread(); | |
| 166 | |
| 167 bool is_hidden_from_external_view() const { return true; } | |
| 168 | |
| 169 void loop(); // main method | |
| 170 | |
| 171 void manipulatePLL(SLT_msg_type msg); | |
| 172 | |
| 173 }; | |
| 1972 | 174 |
| 175 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_CONCURRENTGCTHREAD_HPP |