////////////////////////////////////////////////////////////////////////////////
/// @brief Condition Locker
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2014 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
/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
/// @author Copyright 2008-2013, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#include "ConditionLocker.h"

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

using namespace triagens::basics;

// -----------------------------------------------------------------------------
// --SECTION--                                      constructors and destructors
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief locks the condition variable
///
/// The constructors locks the condition variable, the destructors unlocks
/// the condition variable
////////////////////////////////////////////////////////////////////////////////

#ifdef TRI_SHOW_LOCK_TIME

ConditionLocker::ConditionLocker (ConditionVariable* conditionVariable, char const* file, int line)
  : _conditionVariable(conditionVariable), _file(file), _line(line), _time(0.0) {

  double t = TRI_microtime();
  _conditionVariable->lock();
  _time = TRI_microtime() - t;
}

#else

ConditionLocker::ConditionLocker (ConditionVariable* conditionVariable)
  : _conditionVariable(conditionVariable) {

  _conditionVariable->lock();
}

#endif

////////////////////////////////////////////////////////////////////////////////
/// @brief unlocks the condition variable
////////////////////////////////////////////////////////////////////////////////

ConditionLocker::~ConditionLocker () {
  _conditionVariable->unlock();

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

// -----------------------------------------------------------------------------
// --SECTION--                                                    public methods
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief waits for an event to occur
////////////////////////////////////////////////////////////////////////////////

void ConditionLocker::wait () {
  _conditionVariable->wait();
}

////////////////////////////////////////////////////////////////////////////////
/// @brief waits for an event to occur, with a timeout in microseconds
////////////////////////////////////////////////////////////////////////////////

bool ConditionLocker::wait (uint64_t delay) {
  return _conditionVariable->wait(delay);
}

////////////////////////////////////////////////////////////////////////////////
/// @brief broadcasts an event
////////////////////////////////////////////////////////////////////////////////

void ConditionLocker::broadcast () {
  _conditionVariable->broadcast();
}

////////////////////////////////////////////////////////////////////////////////
/// @brief signals an event
////////////////////////////////////////////////////////////////////////////////

void ConditionLocker::signal () {
  _conditionVariable->signal();
}

////////////////////////////////////////////////////////////////////////////////
/// @brief unlocks the variable (handle with care, no exception allowed)
////////////////////////////////////////////////////////////////////////////////

void ConditionLocker::unlock () {
  _conditionVariable->unlock();
}

////////////////////////////////////////////////////////////////////////////////
/// @brief relock the variable after unlock
////////////////////////////////////////////////////////////////////////////////

void ConditionLocker::lock () {
  _conditionVariable->lock();
}

// -----------------------------------------------------------------------------
// --SECTION--                                                       END-OF-FILE
// -----------------------------------------------------------------------------

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