| /* |
| * Copyright (c) 1997, 2015, 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_RUNTIME_THREADLOCALSTORAGE_HPP |
| #define SHARE_VM_RUNTIME_THREADLOCALSTORAGE_HPP |
| |
| #include "utilities/top.hpp" |
| |
| // forward-decl as we can't have an include cycle |
| class Thread; |
| |
| // Wrapper class for library-based (as opposed to compiler-based) |
| // thread-local storage (TLS). All platforms require this for |
| // signal-handler based TLS access (which while not strictly async-signal |
| // safe in theory, is and has-been for a long time, in practice). |
| // Platforms without compiler-based TLS (i.e. __thread storage-class modifier) |
| // will use this implementation for all TLS access - see thread.hpp/cpp |
| |
| class ThreadLocalStorage : AllStatic { |
| |
| // Exported API |
| public: |
| static Thread* thread(); // return current thread, if attached |
| static void set_thread(Thread* thread); // set current thread |
| static void init(); |
| static bool is_initialized(); // can't use TLS prior to initialization |
| }; |
| |
| #endif // SHARE_VM_RUNTIME_THREADLOCALSTORAGE_HPP |