author | tonyp |
Tue, 24 Aug 2010 17:24:33 -0400 | |
changeset 7398 | e4aa6d9bda09 |
parent 7397 | 5b173b4ca846 |
child 7920 | 298df61588a2 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP |
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#include "gc_implementation/g1/ptrQueue.hpp" |
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class ObjectClosure; |
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class JavaThread; |
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// A ptrQueue whose elements are "oops", pointers to object heads. |
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class ObjPtrQueue: public PtrQueue { |
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public: |
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ObjPtrQueue(PtrQueueSet* qset_, bool perm = false) : |
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// SATB queues are only active during marking cycles. We create |
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// them with their active field set to false. If a thread is |
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// created during a cycle and its SATB queue needs to be activated |
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// before the thread starts running, we'll need to set its active |
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// field to true. This is done in JavaThread::initialize_queues(). |
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PtrQueue(qset_, perm, false /* active */) { } |
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// Apply the closure to all elements, and reset the index to make the |
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// buffer empty. |
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void apply_closure(ObjectClosure* cl); |
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// Apply the closure to all elements of "buf", down to "index" (inclusive.) |
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static void apply_closure_to_buffer(ObjectClosure* cl, |
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void** buf, size_t index, size_t sz); |
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void verify_oops_in_buffer() NOT_DEBUG_RETURN; |
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}; |
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class SATBMarkQueueSet: public PtrQueueSet { |
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ObjectClosure* _closure; |
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ObjectClosure** _par_closures; // One per ParGCThread. |
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ObjPtrQueue _shared_satb_queue; |
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// Utility function to support sequential and parallel versions. If |
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// "par" is true, then "worker" is the par thread id; if "false", worker |
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// is ignored. |
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bool apply_closure_to_completed_buffer_work(bool par, int worker); |
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#ifdef ASSERT |
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void dump_active_values(JavaThread* first, bool expected_active); |
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#endif // ASSERT |
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public: |
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SATBMarkQueueSet(); |
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void initialize(Monitor* cbl_mon, Mutex* fl_lock, |
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int process_completed_threshold, |
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Mutex* lock); |
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static void handle_zero_index_for_thread(JavaThread* t); |
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// Apply "set_active(b)" to all Java threads' SATB queues. It should be |
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// called only with the world stopped. The method will assert that the |
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// SATB queues of all threads it visits, as well as the SATB queue |
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// set itself, has an active value same as expected_active. |
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void set_active_all_threads(bool b, bool expected_active); |
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// Register "blk" as "the closure" for all queues. Only one such closure |
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// is allowed. The "apply_closure_to_completed_buffer" method will apply |
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// this closure to a completed buffer, and "iterate_closure_all_threads" |
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// applies it to partially-filled buffers (the latter should only be done |
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// with the world stopped). |
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void set_closure(ObjectClosure* closure); |
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// Set the parallel closures: pointer is an array of pointers to |
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// closures, one for each parallel GC thread. |
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void set_par_closure(int i, ObjectClosure* closure); |
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// If there is a registered closure for buffers, apply it to all entries |
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// in all currently-active buffers. This should only be applied at a |
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// safepoint. (Currently must not be called in parallel; this should |
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// change in the future.) |
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void iterate_closure_all_threads(); |
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// Parallel version of the above. |
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void par_iterate_closure_all_threads(int worker); |
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// If there exists some completed buffer, pop it, then apply the |
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// registered closure to all its elements, and return true. If no |
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// completed buffers exist, return false. |
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bool apply_closure_to_completed_buffer() { |
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return apply_closure_to_completed_buffer_work(false, 0); |
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} |
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// Parallel version of the above. |
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bool par_apply_closure_to_completed_buffer(int worker) { |
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return apply_closure_to_completed_buffer_work(true, worker); |
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} |
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ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; } |
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// If a marking is being abandoned, reset any unprocessed log buffers. |
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void abandon_partial_marking(); |
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}; |
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP |