/*

 * Copyright (c) 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.

 *

 */

#include "precompiled.hpp"

#include "runtime/threadLocalStorage.hpp"

#include <windows.h>

static DWORD _thread_key;

static bool _initialized = false;

void ThreadLocalStorage::init() {

  assert(!_initialized, "initializing TLS more than once!");

  _thread_key = TlsAlloc();

  // If this assert fails we will get a recursive assertion failure

  // and not see the actual error message or get a hs_err file

  assert(_thread_key != TLS_OUT_OF_INDEXES, "TlsAlloc failed: out of indices");

  _initialized = true;

}

bool ThreadLocalStorage::is_initialized() {

  return _initialized;

}

Thread* ThreadLocalStorage::thread() {

  // If this assert fails we will get a recursive assertion failure

  // and not see the actual error message or get a hs_err file.

  // Which most likely indicates we have taken an error path early in

  // the initialization process, which is using Thread::current without

  // checking TLS is initialized - see java.cpp vm_exit

  assert(_initialized, "TLS not initialized yet!");

  Thread* current = (Thread*) TlsGetValue(_thread_key);

  assert(current != 0 || GetLastError() == ERROR_SUCCESS,

         "TlsGetValue failed with error code: %lu", GetLastError());

  return current;

}

void ThreadLocalStorage::set_thread(Thread* current) {

  assert(_initialized, "TLS not initialized yet!");

  BOOL res = TlsSetValue(_thread_key, current);

  assert(res, "TlsSetValue failed with error code: %lu", GetLastError());

}