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1 /*
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2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class ObjectClosure;
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26 class JavaThread;
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27
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28 // A ptrQueue whose elements are "oops", pointers to object heads.
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29 class ObjPtrQueue: public PtrQueue {
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30 public:
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31 ObjPtrQueue(PtrQueueSet* qset_, bool perm = false) :
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32 PtrQueue(qset_, perm)
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33 {}
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34 // Apply the closure to all elements, and reset the index to make the
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35 // buffer empty.
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36 void apply_closure(ObjectClosure* cl);
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37
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38 // Apply the closure to all elements of "buf", down to "index" (inclusive.)
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39 static void apply_closure_to_buffer(ObjectClosure* cl,
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40 void** buf, size_t index, size_t sz);
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41
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42 };
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43
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44
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45
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46 class SATBMarkQueueSet: public PtrQueueSet {
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47 ObjectClosure* _closure;
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48 ObjectClosure** _par_closures; // One per ParGCThread.
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49
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50 ObjPtrQueue _shared_satb_queue;
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51
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52 // Utility function to support sequential and parallel versions. If
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53 // "par" is true, then "worker" is the par thread id; if "false", worker
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54 // is ignored.
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55 bool apply_closure_to_completed_buffer_work(bool par, int worker);
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56
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57
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58 public:
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59 SATBMarkQueueSet();
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60
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61 void initialize(Monitor* cbl_mon, Mutex* fl_lock,
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62 int max_completed_queue = 0,
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63 Mutex* lock = NULL);
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64
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65 static void handle_zero_index_for_thread(JavaThread* t);
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66
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67 // Apply "set_active(b)" to all thread tloq's. Should be called only
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68 // with the world stopped.
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69 void set_active_all_threads(bool b);
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70
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71 // Register "blk" as "the closure" for all queues. Only one such closure
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72 // is allowed. The "apply_closure_to_completed_buffer" method will apply
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73 // this closure to a completed buffer, and "iterate_closure_all_threads"
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74 // applies it to partially-filled buffers (the latter should only be done
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75 // with the world stopped).
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76 void set_closure(ObjectClosure* closure);
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77 // Set the parallel closures: pointer is an array of pointers to
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78 // closures, one for each parallel GC thread.
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79 void set_par_closure(int i, ObjectClosure* closure);
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80
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81 // If there is a registered closure for buffers, apply it to all entries
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82 // in all currently-active buffers. This should only be applied at a
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83 // safepoint. (Currently must not be called in parallel; this should
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84 // change in the future.)
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85 void iterate_closure_all_threads();
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86 // Parallel version of the above.
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87 void par_iterate_closure_all_threads(int worker);
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88
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89 // If there exists some completed buffer, pop it, then apply the
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90 // registered closure to all its elements, and return true. If no
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91 // completed buffers exist, return false.
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92 bool apply_closure_to_completed_buffer() {
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93 return apply_closure_to_completed_buffer_work(false, 0);
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94 }
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95 // Parallel version of the above.
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96 bool par_apply_closure_to_completed_buffer(int worker) {
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97 return apply_closure_to_completed_buffer_work(true, worker);
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98 }
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99
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100 ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; }
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101
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102 // If a marking is being abandoned, reset any unprocessed log buffers.
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103 void abandon_partial_marking();
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104
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105 };
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