1 /*

     2  * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 #include "precompiled.hpp"

    26 #include "runtime/os.inline.hpp"

    27 #include "runtime/thread.inline.hpp"

    28 #include "runtime/threadLocalStorage.hpp"

    29 

    30 // Solaris no longer has this kind of ThreadLocalStorage implementation.

    31 // This will be removed from all platforms in the near future.

    32 

    33 #ifndef SOLARIS

    34 

    35 // static member initialization

    36 int ThreadLocalStorage::_thread_index = -1;

    37 

    38 Thread* ThreadLocalStorage::get_thread_slow() {

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

    40 }

    41 

    42 void ThreadLocalStorage::set_thread(Thread* thread) {

    43   pd_set_thread(thread);

    44 

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

    46   // did not backfire on us:

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

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

    49 }

    50 

    51 void ThreadLocalStorage::init() {

    52   assert(!is_initialized(),

    53          "More than one attempt to initialize threadLocalStorage");

    54   pd_init();

    55   set_thread_index(os::allocate_thread_local_storage());

    56   generate_code_for_get_thread();

    57 }

    58 

    59 bool ThreadLocalStorage::is_initialized() {

    60     return (thread_index() != -1);

    61 }

    62 

    63 #endif // SOLARIS