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 friend class GCIdMarkAndRestore; 33 static uint _next_id; 34 static const uint UNDEFINED = (uint)-1; 35 static const uint create(); 36 37 public: 38 // Returns the currently active GC id. Asserts that there is an active GC id. 39 static const uint current(); 40 // Same as current() but can return undefined() if no GC id is currently active 41 static const uint current_raw(); 42 static const uint undefined() { return UNDEFINED; } 43 static size_t print_prefix(char* buf, size_t len); 44 }; 45 46 class GCIdMark : public StackObj { 47 uint _gc_id; 48 public: 49 GCIdMark(); 50 GCIdMark(uint gc_id); 51 ~GCIdMark(); 52 }; 53 54 class GCIdMarkAndRestore : public StackObj { 55 uint _gc_id; 56 uint _previous_gc_id; 57 public: 58 GCIdMarkAndRestore(); 59 GCIdMarkAndRestore(uint gc_id); 60 ~GCIdMarkAndRestore(); 61 }; 62 63 #endif // SHARE_VM_GC_SHARED_GCID_HPP