author | kbarrett |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2015, 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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class SATBMarkQueueSet; |
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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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friend class Threads; |
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friend class SATBMarkQueueSet; |
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friend class G1RemarkThreadsClosure; |
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private: |
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// Filter out unwanted entries from the buffer. |
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void filter(); |
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// Apply the closure to all elements. |
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void apply_closure(ObjectClosure* cl); |
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// Apply the closure to all elements and empty the buffer; |
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void apply_closure_and_empty(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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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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// Process queue entries and free resources. |
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void flush(); |
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// Overrides PtrQueue::should_enqueue_buffer(). See the method's |
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// definition for more information. |
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virtual bool should_enqueue_buffer(); |
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#ifndef PRODUCT |
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// Helpful for debugging |
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void print(const char* name); |
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static void print(const char* name, void** buf, size_t index, size_t sz); |
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#endif // PRODUCT |
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}; |
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class SATBMarkQueueSet: public PtrQueueSet { |
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ObjPtrQueue _shared_satb_queue; |
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#ifdef ASSERT |
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void dump_active_states(bool expected_active); |
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void verify_active_states(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(active)" to all SATB queues in the set. 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 active, bool expected_active); |
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// Filter all the currently-active SATB buffers. |
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void filter_thread_buffers(); |
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// If there exists some completed buffer, pop it, then apply the |
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// 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(ObjectClosure* closure); |
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// Apply the given closure on enqueued and currently-active buffers |
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// respectively. Both methods are read-only, i.e., they do not |
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// modify any of the buffers. |
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void iterate_completed_buffers_read_only(ObjectClosure* cl); |
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void iterate_thread_buffers_read_only(ObjectClosure* cl); |
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#ifndef PRODUCT |
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// Helpful for debugging |
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void print_all(const char* msg); |
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#endif // PRODUCT |
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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 |