1 /* 2 * Copyright (c) 2016, 2019, 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 #include "jfr/recorder/stringpool/jfrStringPoolBuffer.hpp" 27 #include "runtime/atomic.hpp" 28 #include "runtime/orderAccess.inline.hpp" 29 #include "runtime/thread.inline.hpp" 30 31 JfrStringPoolBuffer::JfrStringPoolBuffer() : JfrBuffer(), _string_count_pos(0), _string_count_top(0) {} 32 33 void JfrStringPoolBuffer::reinitialize() { 34 concurrent_top(); 35 set_pos((start())); 36 set_string_pos(0); 37 set_string_top(0); 38 set_concurrent_top(start()); 39 } 40 41 uint64_t JfrStringPoolBuffer::string_pos() const { 42 return OrderAccess::load_acquire(&_string_count_pos); 43 } 44 45 uint64_t JfrStringPoolBuffer::string_top() const { 46 return OrderAccess::load_acquire(&_string_count_top); 47 } 48 49 uint64_t JfrStringPoolBuffer::string_count() const { 50 return string_pos() - string_top(); 51 } 52 53 void JfrStringPoolBuffer::set_string_pos(uint64_t value) { 54 Atomic::store(value, &_string_count_pos); 55 } 56 57 void JfrStringPoolBuffer::increment(uint64_t value) { 58 Atomic::add(value, &_string_count_pos); 59 } 60 61 void JfrStringPoolBuffer::set_string_top(uint64_t value) { 62 Atomic::store(value, &_string_count_top); 63 }