/*

 * Copyright (c) 2015 SAP SE. 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 "misc_aix.hpp"

#include "runtime/stubRoutines.hpp"

#include <pthread.h>

#include <unistd.h>

#include <errno.h>

void MiscUtils::init_critsect(MiscUtils::critsect_t* cs) {

  const int rc = pthread_mutex_init(cs, NULL);

  assert0(rc == 0);

}

void MiscUtils::free_critsect(MiscUtils::critsect_t* cs) {

  const int rc = pthread_mutex_destroy(cs);

  assert0(rc == 0);

}

void MiscUtils::enter_critsect(MiscUtils::critsect_t* cs) {

  const int rc = pthread_mutex_lock(cs);

  assert0(rc == 0);

}

void MiscUtils::leave_critsect(MiscUtils::critsect_t* cs) {

  const int rc = pthread_mutex_unlock(cs);

  assert0(rc == 0);

}

bool MiscUtils::is_readable_pointer(const void* p) {

  if (!CanUseSafeFetch32()) {

    return true;

  }

  int* const aligned = (int*) align_down(p, 4);

  int cafebabe = 0xcafebabe;

  int deadbeef = 0xdeadbeef;

  return (SafeFetch32(aligned, cafebabe) != cafebabe) ||

         (SafeFetch32(aligned, deadbeef) != deadbeef);

}