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86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
/*
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* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "runtime/thread.inline.hpp"
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#include "runtime/threadCritical.hpp"
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// OS-includes here
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#include <thread.h>
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#include <synch.h>
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//
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// See threadCritical.hpp for details of this class.
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//
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// For some reason, we don't do locking until the
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// os::init() call completes. I'm not sure why this
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// is, and have left it that way for now. This should
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// be reviewed later.
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static mutex_t global_mut;
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static thread_t global_mut_owner = -1;
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static int global_mut_count = 0;
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static bool initialized = false;
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ThreadCritical::ThreadCritical() {
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if (initialized) {
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thread_t owner = thr_self();
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if (global_mut_owner != owner) {
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if (os::Solaris::mutex_lock(&global_mut))
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fatal(err_msg("ThreadCritical::ThreadCritical: mutex_lock failed (%s)",
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strerror(errno)));
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assert(global_mut_count == 0, "must have clean count");
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assert(global_mut_owner == -1, "must have clean owner");
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}
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global_mut_owner = owner;
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++global_mut_count;
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} else {
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assert (Threads::number_of_threads() == 0, "valid only during initialization");
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}
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}
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ThreadCritical::~ThreadCritical() {
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if (initialized) {
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assert(global_mut_owner == thr_self(), "must have correct owner");
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assert(global_mut_count > 0, "must have correct count");
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--global_mut_count;
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if (global_mut_count == 0) {
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global_mut_owner = -1;
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if (os::Solaris::mutex_unlock(&global_mut))
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fatal(err_msg("ThreadCritical::~ThreadCritical: mutex_unlock failed "
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"(%s)", strerror(errno)));
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}
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} else {
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assert (Threads::number_of_threads() == 0, "valid only during initialization");
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}
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}
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void ThreadCritical::initialize() {
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// This method is called at the end of os::init(). Until
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// then, we don't do real locking.
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initialized = true;
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}
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void ThreadCritical::release() {
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}
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