1 /* 2 * Copyright (c) 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/threadLocalStorage.hpp" 27 #include <windows.h> 28 29 static DWORD _thread_key; 30 static bool _initialized = false; 31 32 33 void ThreadLocalStorage::init() { 34 assert(!_initialized, "initializing TLS more than once!"); 35 _thread_key = TlsAlloc(); 36 // If this assert fails we will get a recursive assertion failure 37 // and not see the actual error message or get a hs_err file 38 assert(_thread_key != TLS_OUT_OF_INDEXES, "TlsAlloc failed: out of indices"); 39 _initialized = true; 40 } 41 42 bool ThreadLocalStorage::is_initialized() { 43 return _initialized; 44 } 45 46 Thread* ThreadLocalStorage::thread() { 47 // If this assert fails we will get a recursive assertion failure 48 // and not see the actual error message or get a hs_err file. 49 // Which most likely indicates we have taken an error path early in 50 // the initialization process, which is using Thread::current without 51 // checking TLS is initialized - see java.cpp vm_exit 52 assert(_initialized, "TLS not initialized yet!"); 53 Thread* current = (Thread*) TlsGetValue(_thread_key); 54 assert(current != 0 || GetLastError() == ERROR_SUCCESS, 55 "TlsGetValue failed with error code: %lu", GetLastError()); 56 return current; 57 } 58 59 void ThreadLocalStorage::set_thread(Thread* current) { 60 assert(_initialized, "TLS not initialized yet!"); 61 BOOL res = TlsSetValue(_thread_key, current); 62 assert(res, "TlsSetValue failed with error code: %lu", GetLastError()); 63 }