1 /* 2 * Copyright (c) 2018, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 27 #include "gc/shared/stringdedup/stringDedup.hpp" 28 #include "gc/shared/stringdedup/stringDedupQueue.hpp" 29 #include "runtime/atomic.hpp" 30 31 StringDedupQueue* StringDedupQueue::_queue = NULL; 32 volatile size_t StringDedupQueue::_claimed_index = 0; 33 34 size_t StringDedupQueue::claim() { 35 return Atomic::add(size_t(1), &_claimed_index) - 1; 36 } 37 38 void StringDedupQueue::unlink_or_oops_do(StringDedupUnlinkOrOopsDoClosure* cl) { 39 size_t claimed_queue = claim(); 40 while (claimed_queue < queue()->num_queues()) { 41 queue()->queue_unlink_or_oops_do(cl, claimed_queue); 42 claimed_queue = claim(); 43 } 44 } 45 46 void StringDedupQueue::print_statistics() { 47 queue()->queue_print_statistics(); 48 } 49 50 void StringDedupQueue::verify() { 51 queue()->queue_verify(); 52 } 53 54 StringDedupQueue* const StringDedupQueue::queue() { 55 assert(_queue != NULL, "Not yet initialized"); 56 return _queue; 57 } 58 59 60 void StringDedupQueue::gc_prologue() { 61 _claimed_index = 0; 62 } 63 64 void StringDedupQueue::gc_epilogue() { 65 assert(_claimed_index >= queue()->num_queues() || _claimed_index == 0, "All or nothing"); 66 }