/* * Copyright (c) 2014, 2018, 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_SHARED_GCID_HPP #define SHARE_VM_GC_SHARED_GCID_HPP #include "memory/allocation.hpp" class GCId : public AllStatic { friend class GCIdMark; friend class GCIdMarkAndRestore; static uint _next_id; static const uint UNDEFINED = (uint)-1; static const uint create(); public: // Returns the currently active GC id. Asserts that there is an active GC id. static const uint current(); // Same as current() but can return undefined() if no GC id is currently active static const uint current_or_undefined(); // Returns the next expected GCId. static const uint peek(); static const uint undefined() { return UNDEFINED; } static size_t print_prefix(char* buf, size_t len); }; class GCIdMark : public StackObj { uint _gc_id; public: GCIdMark(); GCIdMark(uint gc_id); ~GCIdMark(); }; class GCIdMarkAndRestore : public StackObj { uint _gc_id; uint _previous_gc_id; public: GCIdMarkAndRestore(); GCIdMarkAndRestore(uint gc_id); ~GCIdMarkAndRestore(); }; #endif // SHARE_VM_GC_SHARED_GCID_HPP