Mercurial > hg > graal-jvmci-8
view src/share/vm/gc_implementation/g1/satbQueue.hpp @ 23287:bd88fd590f4e
Restore G1 changes from e13c65f874e5 after merge
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Fri, 08 Jan 2016 15:46:55 +0100 |
parents | dd9cc155639c |
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/* * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP #define SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP #include "memory/allocation.hpp" #include "gc_implementation/g1/ptrQueue.hpp" class JavaThread; class SATBMarkQueueSet; // Base class for processing the contents of a SATB buffer. class SATBBufferClosure : public StackObj { protected: ~SATBBufferClosure() { } public: // Process the SATB entries in the designated buffer range. virtual void do_buffer(void** buffer, size_t size) = 0; }; // A ptrQueue whose elements are "oops", pointers to object heads. class ObjPtrQueue: public PtrQueue { friend class SATBMarkQueueSet; private: // Filter out unwanted entries from the buffer. void filter(); public: ObjPtrQueue(PtrQueueSet* qset, bool perm = false) : // SATB queues are only active during marking cycles. We create // them with their active field set to false. If a thread is // created during a cycle and its SATB queue needs to be activated // before the thread starts running, we'll need to set its active // field to true. This is done in JavaThread::initialize_queues(). PtrQueue(qset, perm, false /* active */) { } // Process queue entries and free resources. void flush(); // Apply cl to the active part of the buffer. // Prerequisite: Must be at a safepoint. void apply_closure_and_empty(SATBBufferClosure* cl); // Overrides PtrQueue::should_enqueue_buffer(). See the method's // definition for more information. virtual bool should_enqueue_buffer(); #ifndef PRODUCT // Helpful for debugging void print(const char* name); static void print(const char* name, void** buf, size_t index, size_t sz); #endif // PRODUCT }; class SATBMarkQueueSet: public PtrQueueSet { ObjPtrQueue _shared_satb_queue; #ifdef ASSERT void dump_active_states(bool expected_active); void verify_active_states(bool expected_active); #endif // ASSERT public: SATBMarkQueueSet(); void initialize(Monitor* cbl_mon, Mutex* fl_lock, int process_completed_threshold, Mutex* lock); static void handle_zero_index_for_thread(JavaThread* t); // Apply "set_active(active)" to all SATB queues in the set. It should be // called only with the world stopped. The method will assert that the // SATB queues of all threads it visits, as well as the SATB queue // set itself, has an active value same as expected_active. void set_active_all_threads(bool active, bool expected_active); // Filter all the currently-active SATB buffers. void filter_thread_buffers(); // If there exists some completed buffer, pop and process it, and // return true. Otherwise return false. Processing a buffer // consists of applying the closure to the buffer range starting // with the first non-NULL entry to the end of the buffer; the // leading entries may be NULL due to filtering. bool apply_closure_to_completed_buffer(SATBBufferClosure* cl); #ifndef PRODUCT // Helpful for debugging void print_all(const char* msg); #endif // PRODUCT ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; } // If a marking is being abandoned, reset any unprocessed log buffers. void abandon_partial_marking(); }; #endif // SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP