/*

 * Copyright (c) 1997, 2010, 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/thread.inline.hpp"

#include "runtime/threadLocalStorage.hpp"

#ifdef TARGET_OS_FAMILY_linux

# include "os_linux.inline.hpp"

#endif

#ifdef TARGET_OS_FAMILY_solaris

# include "os_solaris.inline.hpp"

#endif

#ifdef TARGET_OS_FAMILY_windows

# include "os_windows.inline.hpp"

#endif

#ifdef TARGET_OS_FAMILY_bsd

# include "os_bsd.inline.hpp"

#endif

// static member initialization

int ThreadLocalStorage::_thread_index = -1;

Thread* ThreadLocalStorage::get_thread_slow() {

  return (Thread*) os::thread_local_storage_at(ThreadLocalStorage::thread_index());

}

void ThreadLocalStorage::set_thread(Thread* thread) {

  pd_set_thread(thread);

  // The following ensure that any optimization tricks we have tried

  // did not backfire on us:

  guarantee(get_thread()      == thread, "must be the same thread, quickly");

  guarantee(get_thread_slow() == thread, "must be the same thread, slowly");

}

void ThreadLocalStorage::init() {

  assert(!is_initialized(),

         "More than one attempt to initialize threadLocalStorage");

  pd_init();

  set_thread_index(os::allocate_thread_local_storage());

  generate_code_for_get_thread();

}

bool ThreadLocalStorage::is_initialized() {

    return (thread_index() != -1);

}