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 }