/* * Copyright (c) 2015, 2022, 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. *
*/
// 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;
}
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");
}
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