/*

 * Copyright (c) 2001, 2016, 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/os.hpp"

#include "runtime/thread.inline.hpp"

#include "runtime/threadCritical.hpp"

// OS-includes here

#include <thread.h>

#include <synch.h>

//

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

//

// For some reason, we don't do locking until the

// os::init() call completes. I'm not sure why this

// is, and have left it that way for now. This should

// be reviewed later.

static  mutex_t  global_mut;

static  thread_t global_mut_owner = -1;

static  int      global_mut_count = 0;

static  bool     initialized = false;

ThreadCritical::ThreadCritical() {

  if (initialized) {

    thread_t owner = thr_self();

    if (global_mut_owner != owner) {

      if (os::Solaris::mutex_lock(&global_mut))

        fatal("ThreadCritical::ThreadCritical: mutex_lock failed (%s)",

              os::strerror(errno));

      assert(global_mut_count == 0, "must have clean count");

      assert(global_mut_owner == -1, "must have clean owner");

    }

    global_mut_owner = owner;

    ++global_mut_count;

  } else {

    assert (Threads::number_of_threads() == 0, "valid only during initialization");

  }

}

ThreadCritical::~ThreadCritical() {

  if (initialized) {

    assert(global_mut_owner == thr_self(), "must have correct owner");

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

    --global_mut_count;

    if (global_mut_count == 0) {

      global_mut_owner = -1;

      if (os::Solaris::mutex_unlock(&global_mut))

        fatal("ThreadCritical::~ThreadCritical: mutex_unlock failed (%s)", os::strerror(errno));

    }

  } else {

    assert (Threads::number_of_threads() == 0, "valid only during initialization");

  }

}

void ThreadCritical::initialize() {

  // This method is called at the end of os::init(). Until

  // then, we don't do real locking.

  initialized = true;

}

void ThreadCritical::release() {

}