mirror of https://gitee.com/bigwinds/arangodb
128 lines
3.2 KiB
C++
128 lines
3.2 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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/// @author Achim Brandt
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_BASICS_CONDITION_LOCKER_H
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#define ARANGODB_BASICS_CONDITION_LOCKER_H 1
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#include "Basics/Common.h"
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#include <chrono>
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/// @brief construct locker with file and line information
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#ifdef TRI_SHOW_LOCK_TIME
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#define CONDITION_LOCKER(a, b) \
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arangodb::basics::ConditionLocker a(&b, __FILE__, __LINE__)
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#else
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#define CONDITION_LOCKER(a, b) ::arangodb::basics::ConditionLocker a(&b)
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#endif
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namespace arangodb {
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namespace basics {
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class ConditionVariable;
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/// @brief condition locker
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///
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/// A ConditionLocker locks a condition when constructed and releases the lock
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/// when destroyed. It is possible the wait for an event in which case the lock
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/// is released or to broadcast an event.
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class ConditionLocker {
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ConditionLocker(ConditionLocker const&);
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ConditionLocker& operator=(ConditionLocker const&);
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public:
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/// @brief locks the condition variable
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///
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/// The constructor locks the condition variable, the destructor unlocks
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/// the condition variable
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#ifdef TRI_SHOW_LOCK_TIME
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ConditionLocker(ConditionVariable* conditionVariable, char const* file,
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int line);
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#else
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explicit ConditionLocker(ConditionVariable* conditionVariable);
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#endif
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/// @brief unlocks the condition variable
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~ConditionLocker();
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public:
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/// @brief whether or not the condition is locked
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bool isLocked() const { return _isLocked; }
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/// @brief waits for an event to occur
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void wait();
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/// @brief waits for an event to occur, using a timeout in micro seconds
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/// returns true when the condition was signaled, false on timeout
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bool wait(uint64_t);
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/// @brief waits for an event to occur, using a timeout
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/// returns true when the condition was signaled, false on timeout
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bool wait(std::chrono::microseconds);
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/// @brief broadcasts an event
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void broadcast();
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/// @brief signals an event
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void signal();
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/// @brief unlocks the variable (handle with care, no exception allowed)
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void unlock();
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/// @brief relock the variable after unlock
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void lock();
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private:
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/// @brief the condition
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ConditionVariable* _conditionVariable;
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/// @brief lock state
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bool _isLocked;
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#ifdef TRI_SHOW_LOCK_TIME
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/// @brief file
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char const* _file;
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/// @brief line number
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int _line;
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/// @brief lock time
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double _time;
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#endif
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};
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}
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}
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#endif
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