/*

 * Copyright (c) 2001, 2010, 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.

 *

 */

#include "precompiled.hpp"

#include "runtime/thread.inline.hpp"

#include "runtime/threadCritical.hpp"

// put OS-includes here

# include <pthread.h>

//

// See threadCritical.hpp for details of this class.

//

static pthread_t             tc_owner = 0;

static pthread_mutex_t       tc_mutex = PTHREAD_MUTEX_INITIALIZER;

static int                   tc_count = 0;

ThreadCritical::ThreadCritical() {

  pthread_t self = pthread_self();

  if (self != tc_owner) {

    int ret = pthread_mutex_lock(&tc_mutex);

    guarantee(ret == 0, "fatal error with pthread_mutex_lock()");

    assert(tc_count == 0, "Lock acquired with illegal reentry count.");

    tc_owner = self;

  }

  tc_count++;

}

ThreadCritical::~ThreadCritical() {

  assert(tc_owner == pthread_self(), "must have correct owner");

  assert(tc_count > 0, "must have correct count");

  tc_count--;

  if (tc_count == 0) {

    tc_owner = 0;

    int ret = pthread_mutex_unlock(&tc_mutex);

    guarantee(ret == 0, "fatal error with pthread_mutex_unlock()");

  }

}