Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/g1/satbQueue.hpp @ 342:37f87013dfd8
6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
author | ysr |
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date | Thu, 05 Jun 2008 15:57:56 -0700 |
parents | |
children | df6caf649ff7 |
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1 /* | |
2 * Copyright 2001-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class ObjectClosure; | |
26 class JavaThread; | |
27 | |
28 // A ptrQueue whose elements are "oops", pointers to object heads. | |
29 class ObjPtrQueue: public PtrQueue { | |
30 public: | |
31 ObjPtrQueue(PtrQueueSet* qset_, bool perm = false) : | |
32 PtrQueue(qset_, perm) | |
33 {} | |
34 // Apply the closure to all elements, and reset the index to make the | |
35 // buffer empty. | |
36 void apply_closure(ObjectClosure* cl); | |
37 | |
38 // Apply the closure to all elements of "buf", down to "index" (inclusive.) | |
39 static void apply_closure_to_buffer(ObjectClosure* cl, | |
40 void** buf, size_t index, size_t sz); | |
41 | |
42 }; | |
43 | |
44 | |
45 | |
46 class SATBMarkQueueSet: public PtrQueueSet { | |
47 ObjectClosure* _closure; | |
48 ObjectClosure** _par_closures; // One per ParGCThread. | |
49 | |
50 ObjPtrQueue _shared_satb_queue; | |
51 | |
52 // Utility function to support sequential and parallel versions. If | |
53 // "par" is true, then "worker" is the par thread id; if "false", worker | |
54 // is ignored. | |
55 bool apply_closure_to_completed_buffer_work(bool par, int worker); | |
56 | |
57 | |
58 public: | |
59 SATBMarkQueueSet(); | |
60 | |
61 void initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
62 int max_completed_queue = 0, | |
63 Mutex* lock = NULL); | |
64 | |
65 static void handle_zero_index_for_thread(JavaThread* t); | |
66 | |
67 // Apply "set_active(b)" to all thread tloq's. Should be called only | |
68 // with the world stopped. | |
69 void set_active_all_threads(bool b); | |
70 | |
71 // Register "blk" as "the closure" for all queues. Only one such closure | |
72 // is allowed. The "apply_closure_to_completed_buffer" method will apply | |
73 // this closure to a completed buffer, and "iterate_closure_all_threads" | |
74 // applies it to partially-filled buffers (the latter should only be done | |
75 // with the world stopped). | |
76 void set_closure(ObjectClosure* closure); | |
77 // Set the parallel closures: pointer is an array of pointers to | |
78 // closures, one for each parallel GC thread. | |
79 void set_par_closure(int i, ObjectClosure* closure); | |
80 | |
81 // If there is a registered closure for buffers, apply it to all entries | |
82 // in all currently-active buffers. This should only be applied at a | |
83 // safepoint. (Currently must not be called in parallel; this should | |
84 // change in the future.) | |
85 void iterate_closure_all_threads(); | |
86 // Parallel version of the above. | |
87 void par_iterate_closure_all_threads(int worker); | |
88 | |
89 // If there exists some completed buffer, pop it, then apply the | |
90 // registered closure to all its elements, and return true. If no | |
91 // completed buffers exist, return false. | |
92 bool apply_closure_to_completed_buffer() { | |
93 return apply_closure_to_completed_buffer_work(false, 0); | |
94 } | |
95 // Parallel version of the above. | |
96 bool par_apply_closure_to_completed_buffer(int worker) { | |
97 return apply_closure_to_completed_buffer_work(true, worker); | |
98 } | |
99 | |
100 ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; } | |
101 | |
102 // If a marking is being abandoned, reset any unprocessed log buffers. | |
103 void abandon_partial_marking(); | |
104 | |
105 }; |