51 lines
2.0 KiB
C++
51 lines
2.0 KiB
C++
/*
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* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_RUNTIME_THREADLOCALSTORAGE_HPP
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#define SHARE_VM_RUNTIME_THREADLOCALSTORAGE_HPP
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#include "memory/allocation.hpp"
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// forward-decl as we can't have an include cycle
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class Thread;
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// Wrapper class for library-based (as opposed to compiler-based)
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// thread-local storage (TLS). All platforms require this for
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// signal-handler based TLS access (which while not strictly async-signal
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// safe in theory, is and has-been for a long time, in practice).
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// Platforms without compiler-based TLS (i.e. __thread storage-class modifier)
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// will use this implementation for all TLS access - see thread.hpp/cpp
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class ThreadLocalStorage : AllStatic {
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// Exported API
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public:
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static Thread* thread(); // return current thread, if attached
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static void set_thread(Thread* thread); // set current thread
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static void init();
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static bool is_initialized(); // can't use TLS prior to initialization
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};
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#endif // SHARE_VM_RUNTIME_THREADLOCALSTORAGE_HPP
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