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1 /* |
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2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #ifndef SHARE_VM_RUNTIME_THREADLOCALSTORAGE_HPP |
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26 #define SHARE_VM_RUNTIME_THREADLOCALSTORAGE_HPP |
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27 |
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28 #include "memory/allocation.hpp" |
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29 |
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30 // forward-decl as we can't have an include cycle |
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31 class Thread; |
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32 |
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33 // Wrapper class for library-based (as opposed to compiler-based) |
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34 // thread-local storage (TLS). All platforms require this for |
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35 // signal-handler based TLS access (which while not strictly async-signal |
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36 // safe in theory, is and has-been for a long time, in practice). |
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37 // Platforms without compiler-based TLS (i.e. __thread storage-class modifier) |
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38 // will use this implementation for all TLS access - see thread.hpp/cpp |
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39 |
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40 class ThreadLocalStorage : AllStatic { |
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41 |
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42 // Exported API |
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43 public: |
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44 static Thread* thread(); // return current thread, if attached |
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45 static void set_thread(Thread* thread); // set current thread |
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46 static void init(); |
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47 static bool is_initialized(); // can't use TLS prior to initialization |
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48 }; |
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49 |
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50 #endif // SHARE_VM_RUNTIME_THREADLOCALSTORAGE_HPP |