/* * Copyright (C) 2009, 2011 Google Inc. All rights reserved. * Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "ThreadHolder.h" #include <wtf/Threading.h> namespace WTF { void ThreadHolder::initializeOnce() { threadSpecificKeyCreate(&m_key, destruct); } ThreadHolder* ThreadHolder::current() { ASSERT(m_key != InvalidThreadSpecificKey); return static_cast<ThreadHolder*>(threadSpecificGet(m_key)); } void ThreadHolder::initialize(Thread& thread) { if (!current()) { // Ideally we'd have this as a release assert everywhere, but that would hurt performance. // Having this release assert here means that we will catch "didn't call // WTF::initializeThreading() soon enough" bugs in release mode. ASSERT(m_key != InvalidThreadSpecificKey); threadSpecificSet(m_key, new ThreadHolder(thread)); } } void ThreadHolder::destruct(void* data) { ThreadHolder* threadIdentifierData = static_cast<ThreadHolder*>(data); ASSERT(threadIdentifierData); if (threadIdentifierData->m_isDestroyedOnce) { delete threadIdentifierData; return; } threadIdentifierData->m_isDestroyedOnce = true; // Re-setting the value for key causes another destruct() call after all other thread-specific destructors were called. threadSpecificSet(m_key, threadIdentifierData); } } // namespace WTF