/*
 * @project      The CERN Tape Archive (CTA)
 * @copyright    Copyright © 2021-2022 CERN
 * @license      This program is free software, distributed under the terms of the GNU General Public
 *               Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING". You can
 *               redistribute it and/or modify it under the terms of the GPL Version 3, or (at your
 *               option) any later version.
 *
 *               This program 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 for more details.
 *
 *               In applying this licence, CERN does not waive the privileges and immunities
 *               granted to it by virtue of its status as an Intergovernmental Organization or
 *               submit itself to any jurisdiction.
 */

#include "common/threading/RWLock.hpp"
#include "common/exception/Exception.hpp"
#include "common/utils/utils.hpp"

namespace cta::threading {

//------------------------------------------------------------------------------
//constructor
//------------------------------------------------------------------------------
RWLock::RWLock()  {
  const int rc = pthread_rwlock_init(&m_lock, nullptr);
  if(0 != rc) {
    exception::Exception ex;
    ex.getMessage() << __FUNCTION__ << " failed: Failed to initialise underlying pthread read-write lock: " <<
      utils::errnoToString(rc);
    throw ex;
  }
}

//------------------------------------------------------------------------------
// destructor
//------------------------------------------------------------------------------
RWLock::~RWLock() {
  pthread_rwlock_destroy(&m_lock);
}

//------------------------------------------------------------------------------
// rdlock
//------------------------------------------------------------------------------
void RWLock::rdlock()  {
  const int rc = pthread_rwlock_rdlock(&m_lock);
  if(0 != rc) {
    exception::Exception ex;
    ex.getMessage() << __FUNCTION__ << " failed: Failed to take read lock on underlying pthread read-write lock: "
      << utils::errnoToString(rc);
    throw ex;
  }
}

//------------------------------------------------------------------------------
// wrlock
//------------------------------------------------------------------------------
void RWLock::wrlock()  {
  const int rc = pthread_rwlock_wrlock(&m_lock);
  if(0 != rc) {
    exception::Exception ex;
    ex.getMessage() << __FUNCTION__ << " failed: Failed to take write lock on underlying pthread read-write lock: "
      << utils::errnoToString(rc);
    throw ex;
  }
}

//------------------------------------------------------------------------------
//unlock
//------------------------------------------------------------------------------
void RWLock::unlock()  {
  const int rc = pthread_rwlock_unlock(&m_lock);
  if(0 != rc) {
    exception::Exception ex;
    ex.getMessage() << __FUNCTION__ << " failed: Failed to unlock underlying pthread read-write lock: " <<
      utils::errnoToString(rc);
    throw ex;
  }
}

} // namespace cta::threading