mirror of https://gitee.com/bigwinds/arangodb
91 lines
2.9 KiB
C++
91 lines
2.9 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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////////////////////////////////////////////////////////////////////////////////
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#include "locks.h"
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/// @brief initializes a new condition variable
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void TRI_InitCondition(TRI_condition_t* cond) {
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InitializeCriticalSection(&cond->_lockWaiters);
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InitializeConditionVariable(&cond->_conditionVariable);
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}
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/// @brief destroys a condition variable
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void TRI_DestroyCondition(TRI_condition_t* cond) {
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DeleteCriticalSection(&cond->_lockWaiters);
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}
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/// @brief signals a condition variable
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///
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/// Note that you must hold the lock.
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void TRI_SignalCondition(TRI_condition_t* cond) {
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WakeConditionVariable(&cond->_conditionVariable);
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}
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/// @brief broad casts a condition variable
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///
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/// Note that you must hold the lock.
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void TRI_BroadcastCondition(TRI_condition_t* cond) {
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WakeAllConditionVariable(&cond->_conditionVariable);
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}
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/// @brief waits for a signal on a condition variable
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///
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/// Note that you must hold the lock.
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void TRI_WaitCondition(TRI_condition_t* cond) {
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SleepConditionVariableCS(&cond->_conditionVariable, &cond->_lockWaiters, INFINITE);
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}
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/// @brief waits for a signal with a timeout in micro-seconds
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///
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/// Note that you must hold the lock.
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bool TRI_TimedWaitCondition(TRI_condition_t* cond, uint64_t delay) {
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// ...........................................................................
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// The POSIX threads function pthread_cond_timedwait accepts microseconds
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// while the Windows function accepts milliseconds
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// ...........................................................................
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delay = delay / 1000;
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if (SleepConditionVariableCS(&cond->_conditionVariable, &cond->_lockWaiters,
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(DWORD)delay) != 0) {
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return true;
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}
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DWORD res = GetLastError();
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if (res == ERROR_TIMEOUT) {
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return false;
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}
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return false;
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}
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/// @brief locks the mutex of a condition variable
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void TRI_LockCondition(TRI_condition_t* cond) {
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EnterCriticalSection(&cond->_lockWaiters);
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}
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/// @brief unlocks the mutex of a condition variable
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void TRI_UnlockCondition(TRI_condition_t* cond) {
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LeaveCriticalSection(&cond->_lockWaiters);
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}
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