--- /dev/null 2015-09-28 11:47:54.419050997 -0400 +++ new/src/os/posix/vm/threadLocalStorage_posix.cpp 2015-11-11 15:16:07.595411243 -0500 @@ -0,0 +1,68 @@ +/* + * Copyright (c) 2015, 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 "runtime/threadLocalStorage.hpp" +#include + +static pthread_key_t _thread_key; +static bool _initialized = false; + +// Restore the thread pointer if the destructor is called. This is in case +// someone from JNI code sets up a destructor with pthread_key_create to run +// detachCurrentThread on thread death. Unless we restore the thread pointer we +// will hang or crash. When detachCurrentThread is called the key will be set +// to null and we will not be called again. If detachCurrentThread is never +// called we could loop forever depending on the pthread implementation. +extern "C" void restore_thread_pointer(void* p) { + ThreadLocalStorage::set_thread((Thread*) p); +} + +void ThreadLocalStorage::init() { + assert(!_initialized, "initializing TLS more than once!"); + int rslt = pthread_key_create(&_thread_key, restore_thread_pointer); + // If this assert fails we will get a recursive assertion failure + // and not see the actual error message or get a hs_err file + assert_status(rslt == 0, rslt, "pthread_key_create"); + _initialized = true; +} + +bool ThreadLocalStorage::is_initialized() { + return _initialized; +} + +Thread* ThreadLocalStorage::thread() { + // If this assert fails we will get a recursive assertion failure + // and not see the actual error message or get a hs_err file. + // Which most likely indicates we have taken an error path early in + // the initialization process, which is using Thread::current without + // checking TLS is initialized - see java.cpp vm_exit + assert(_initialized, "TLS not initialized yet!"); + return (Thread*) pthread_getspecific(_thread_key); // may be NULL +} + +void ThreadLocalStorage::set_thread(Thread* current) { + assert(_initialized, "TLS not initialized yet!"); + int rslt = pthread_setspecific(_thread_key, current); + assert_status(rslt == 0, rslt, "pthread_setspecific"); +}