////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
/// @author Achim Brandt
////////////////////////////////////////////////////////////////////////////////

#include "MutexLocker.h"

#ifdef TRI_SHOW_LOCK_TIME
#include "Basics/logging.h"
#endif

using namespace arangodb;
using namespace arangodb::basics;

////////////////////////////////////////////////////////////////////////////////
/// @brief aquires a lock
///
/// The constructor aquires a lock, the destructors releases the lock.
////////////////////////////////////////////////////////////////////////////////

#ifdef TRI_SHOW_LOCK_TIME

MutexLocker::MutexLocker(Mutex* mutex, char const* file, int line)
    : _mutex(mutex), _file(file), _line(line), _time(0.0) {
  double t = TRI_microtime();
  _mutex->lock();
  _time = TRI_microtime() - t;
}

#else

MutexLocker::MutexLocker(Mutex* mutex) : _mutex(mutex) { _mutex->lock(); }

#endif

////////////////////////////////////////////////////////////////////////////////
/// @brief releases the lock
////////////////////////////////////////////////////////////////////////////////

MutexLocker::~MutexLocker() {
  _mutex->unlock();

#ifdef TRI_SHOW_LOCK_TIME
  if (_time > TRI_SHOW_LOCK_THRESHOLD) {
    LOG_WARNING("MutexLocker %s:%d took %f s", _file, _line, _time);
  }
#endif
}