/*+
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 * Copyright (c) 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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+
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#include "precompiled.hpp"+
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#include "runtime/threadLocalStorage.hpp"+
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#include <windows.h>+
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+
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static DWORD _thread_key;+
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static bool _initialized = false;+
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+
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+
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void ThreadLocalStorage::init() {+
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  assert(!_initialized, "initializing TLS more than once!");+
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  _thread_key = TlsAlloc();+
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  // If this assert fails we will get a recursive assertion failure+
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  // and not see the actual error message or get a hs_err file+
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  assert(_thread_key != TLS_OUT_OF_INDEXES, "TlsAlloc failed: out of indices");+
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  _initialized = true;+
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}+
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+
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bool ThreadLocalStorage::is_initialized() {+
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  return _initialized;+
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}+
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+
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Thread* ThreadLocalStorage::thread() {+
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  // If this assert fails we will get a recursive assertion failure+
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  // and not see the actual error message or get a hs_err file.+
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  // Which most likely indicates we have taken an error path early in+
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  // the initialization process, which is using Thread::current without+
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  // checking TLS is initialized - see java.cpp vm_exit+
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  assert(_initialized, "TLS not initialized yet!");+
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  Thread* current = (Thread*) TlsGetValue(_thread_key);+
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  assert(current != 0 || GetLastError() == ERROR_SUCCESS,+
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         "TlsGetValue failed with error code: %lu", GetLastError());+
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  return current;+
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}+
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+
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void ThreadLocalStorage::set_thread(Thread* current) {+
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  assert(_initialized, "TLS not initialized yet!");+
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  BOOL res = TlsSetValue(_thread_key, current);+
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  assert(res, "TlsSetValue failed with error code: %lu", GetLastError());+
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}+
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