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arangodb/lib/Basics/Barrier.cpp

105 lines
3.7 KiB
C++

////////////////////////////////////////////////////////////////////////////////
/// @brief barrier for synchronization
///
/// @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 Jan Steemann
/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
/// @author Copyright 2013-2013, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////
#include "Barrier.h"
#include "Basics/ConditionLocker.h"
using namespace triagens::basics;
// -----------------------------------------------------------------------------
// --SECTION-- Barrier
// -----------------------------------------------------------------------------
// -----------------------------------------------------------------------------
// --SECTION-- constructors / destructors
// -----------------------------------------------------------------------------
////////////////////////////////////////////////////////////////////////////////
/// @brief create a barrier for the specified number of waiters
////////////////////////////////////////////////////////////////////////////////
Barrier::Barrier (size_t size)
: _condition(),
_missing(size) {
}
////////////////////////////////////////////////////////////////////////////////
/// @brief destroy the barrier. this will call synchronize() to ensure all tasks
/// are joined
////////////////////////////////////////////////////////////////////////////////
Barrier::~Barrier () {
synchronize();
}
// -----------------------------------------------------------------------------
// --SECTION-- public functions
// -----------------------------------------------------------------------------
////////////////////////////////////////////////////////////////////////////////
/// @brief join a single task. reduces the number of waiting tasks and wakes
/// up the barrier's synchronize() routine
////////////////////////////////////////////////////////////////////////////////
void Barrier::join () {
{
CONDITION_LOCKER(guard, _condition);
TRI_ASSERT(_missing > 0);
--_missing;
}
_condition.signal();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief wait for all tasks to join
////////////////////////////////////////////////////////////////////////////////
void Barrier::synchronize () {
while (true) {
CONDITION_LOCKER(guard, _condition);
if (_missing == 0) {
break;
}
guard.wait(100000);
}
}
// -----------------------------------------------------------------------------
// --SECTION-- END-OF-FILE
// -----------------------------------------------------------------------------
// Local Variables:
// mode: outline-minor
// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
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