1 /* 2 * Copyright (c) 2014, 2015, 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 #ifndef SHARE_VM_GC_SHARED_GCID_HPP 26 #define SHARE_VM_GC_SHARED_GCID_HPP 27 28 #include "memory/allocation.hpp" 29 30 class GCId : public AllStatic { 31 friend class GCIdMark; 32 static uint _next_id; 33 static const uint UNDEFINED = (uint)-1; 34 static const uint create(); 35 36 public: 37 // Returns the currently active GC id. Asserts that there is an active GC id. 38 static const uint current(); 39 // Same as current() but can return undefined() if no GC id is currently active 40 static const uint current_raw(); 41 static const uint undefined() { return UNDEFINED; } 42 }; 43 44 class GCIdMark { 45 uint _gc_id; 46 public: 47 GCIdMark(); 48 GCIdMark(uint gc_id); 49 ~GCIdMark(); 50 }; 51 52 #endif // SHARE_VM_GC_SHARED_GCID_HPP