120 lines
3.5 KiB
C++
120 lines
3.5 KiB
C++
/*=============================================================================
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Copyright (C) 2012 Allied Vision Technologies. All Rights Reserved.
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Redistribution of this file, in original or modified form, without
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prior written consent of Allied Vision Technologies is prohibited.
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-------------------------------------------------------------------------------
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File: ConditionHelper.cpp
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Description: Implementation of helper class for conditions.
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Intended for use in the implementation of Vimba CPP API.
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-------------------------------------------------------------------------------
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF TITLE,
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NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#include <VimbaCPP/Source/ConditionHelper.h>
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#include <VimbaCPP/Source/MutexGuard.h>
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namespace AVT {
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namespace VmbAPI {
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ConditionHelper::ConditionHelper()
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: m_nNumListReads( 0 )
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, m_bIsWritingList( false )
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, m_bExclusive( false )
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{
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}
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bool ConditionHelper::EnterReadLock( BasicLockable &rLockable )
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{
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return EnterReadLock( rLockable.GetMutex() );
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}
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bool ConditionHelper::EnterReadLock( MutexPtr &pMutex )
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{
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MutexGuard guard( pMutex );
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if ( true == m_bExclusive )
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{
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guard.Release();
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return false;
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}
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while ( true == m_bIsWritingList )
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{
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m_WriteCondition.Wait( pMutex );
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}
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++m_nNumListReads;
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guard.Release();
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return true;
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}
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void ConditionHelper::ExitReadLock( BasicLockable &rLockable )
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{
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ExitReadLock( rLockable.GetMutex() );
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}
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void ConditionHelper::ExitReadLock( MutexPtr &pMutex )
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{
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MutexGuard guard( pMutex );
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if ( 0 == --m_nNumListReads )
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{
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m_ReadCondition.Signal();
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}
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guard.Release();
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}
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bool ConditionHelper::EnterWriteLock( BasicLockable &rLockable, bool bExclusive )
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{
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return EnterWriteLock( rLockable.GetMutex(), bExclusive );
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}
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bool ConditionHelper::EnterWriteLock( MutexPtr &pMutex, bool bExclusive )
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{
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MutexGuard guard( pMutex );
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if ( true == m_bExclusive )
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{
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guard.Release();
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return false;
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}
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while ( true == m_bIsWritingList )
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{
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m_WriteCondition.Wait( pMutex );
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}
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m_bIsWritingList = true;
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m_bExclusive = bExclusive;
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while ( 0 < m_nNumListReads )
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{
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m_ReadCondition.Wait( pMutex );
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}
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guard.Release();
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return true;
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}
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void ConditionHelper::ExitWriteLock( BasicLockable &rLockable )
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{
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ExitWriteLock( rLockable.GetMutex() );
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}
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void ConditionHelper::ExitWriteLock( MutexPtr &pMutex )
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{
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MutexGuard guard( pMutex );
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m_bIsWritingList = false;
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m_bExclusive = false;
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m_WriteCondition.Signal();
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guard.Release();
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}
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}} // namespace AV::VimbaAPI
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