jdk

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/*
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 * Copyright (c) 2001, 2022, Oracle and/or its affiliates. All rights reserved.
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 * Copyright (c) 2012, 2014 SAP SE. 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/javaThread.hpp"
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#include "runtime/threadCritical.hpp"
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// put OS-includes here
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# include <pthread.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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static pthread_t             tc_owner = 0;
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static pthread_mutex_t       tc_mutex = PTHREAD_MUTEX_INITIALIZER;
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static int                   tc_count = 0;
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ThreadCritical::ThreadCritical() {
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  pthread_t self = pthread_self();
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  if (self != tc_owner) {
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    int ret = pthread_mutex_lock(&tc_mutex);
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    guarantee(ret == 0, "fatal error with pthread_mutex_lock()");
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    assert(tc_count == 0, "Lock acquired with illegal reentry count.");
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    tc_owner = self;
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  }
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  tc_count++;
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}
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ThreadCritical::~ThreadCritical() {
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  assert(tc_owner == pthread_self(), "must have correct owner");
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  assert(tc_count > 0, "must have correct count");
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  tc_count--;
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  if (tc_count == 0) {
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    tc_owner = 0;
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    int ret = pthread_mutex_unlock(&tc_mutex);
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    guarantee(ret == 0, "fatal error with pthread_mutex_unlock()");
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  }
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}
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