1/* 2 * Copyright (c) 2001, 2016, 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.hpp" 27#include "runtime/thread.inline.hpp" 28#include "runtime/threadCritical.hpp" 29 30// OS-includes here 31#include <thread.h> 32#include <synch.h> 33 34// 35// See threadCritical.hpp for details of this class. 36// 37// For some reason, we don't do locking until the 38// os::init() call completes. I'm not sure why this 39// is, and have left it that way for now. This should 40// be reviewed later. 41 42static mutex_t global_mut; 43static thread_t global_mut_owner = -1; 44static int global_mut_count = 0; 45static bool initialized = false; 46 47ThreadCritical::ThreadCritical() { 48 if (initialized) { 49 thread_t owner = thr_self(); 50 if (global_mut_owner != owner) { 51 if (os::Solaris::mutex_lock(&global_mut)) 52 fatal("ThreadCritical::ThreadCritical: mutex_lock failed (%s)", 53 os::strerror(errno)); 54 assert(global_mut_count == 0, "must have clean count"); 55 assert(global_mut_owner == -1, "must have clean owner"); 56 } 57 global_mut_owner = owner; 58 ++global_mut_count; 59 } else { 60 assert (Threads::number_of_threads() == 0, "valid only during initialization"); 61 } 62} 63 64ThreadCritical::~ThreadCritical() { 65 if (initialized) { 66 assert(global_mut_owner == thr_self(), "must have correct owner"); 67 assert(global_mut_count > 0, "must have correct count"); 68 --global_mut_count; 69 if (global_mut_count == 0) { 70 global_mut_owner = -1; 71 if (os::Solaris::mutex_unlock(&global_mut)) 72 fatal("ThreadCritical::~ThreadCritical: mutex_unlock failed (%s)", os::strerror(errno)); 73 } 74 } else { 75 assert (Threads::number_of_threads() == 0, "valid only during initialization"); 76 } 77} 78 79void ThreadCritical::initialize() { 80 // This method is called at the end of os::init(). Until 81 // then, we don't do real locking. 82 initialized = true; 83} 84 85void ThreadCritical::release() { 86} 87