1 /*
   2  * Copyright (c) 1997, 2014, 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 // static member initialization
  31 int ThreadLocalStorage::_thread_index = -1;
  32 
  33 Thread* ThreadLocalStorage::get_thread_slow() {
  34   return (Thread*) os::thread_local_storage_at(ThreadLocalStorage::thread_index());
  35 }
  36 
  37 void ThreadLocalStorage::set_thread(Thread* thread) {
  38   pd_set_thread(thread);
  39 
  40   // The following ensure that any optimization tricks we have tried
  41   // did not backfire on us:
  42   guarantee(get_thread()      == thread, "must be the same thread, quickly");
  43   guarantee(get_thread_slow() == thread, "must be the same thread, slowly");
  44 }
  45 
  46 void ThreadLocalStorage::init() {
  47   assert(!is_initialized(),
  48          "More than one attempt to initialize threadLocalStorage");
  49   pd_init();
  50   set_thread_index(os::allocate_thread_local_storage());
  51   generate_code_for_get_thread();
  52 }
  53 
  54 bool ThreadLocalStorage::is_initialized() {
  55     return (thread_index() != -1);
  56 }


--- EOF ---