106 lines
2.9 KiB
C++
106 lines
2.9 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: Condition.cpp
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Description: Implementation of a condition class.
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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/Condition.h>
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namespace AVT {
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namespace VmbAPI {
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Condition::Condition()
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: m_nWaiterNumber( 0 )
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, m_nReleaseNumber( 0 )
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, m_bLocked( true )
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{
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SP_SET( m_Semaphore, new Semaphore() );
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}
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void Condition::Wait( const BasicLockable &rLockable )
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{
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Wait( rLockable.GetMutex() );
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}
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void Condition::Wait( const MutexPtr &rMutex )
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{
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m_nWaiterNumber++;
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SP_ACCESS( rMutex )->Unlock();
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SP_ACCESS( m_Semaphore )->Acquire();
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SP_ACCESS( rMutex) ->Lock();
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if ( m_nWaiterNumber > 0 )
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{
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m_nWaiterNumber--;
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}
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if ( m_nReleaseNumber > 0 )
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{
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m_nReleaseNumber--;
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}
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if( m_nWaiterNumber > 0
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&& m_nReleaseNumber > 0 )
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{
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SP_ACCESS( m_Semaphore )->Release();
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m_bLocked = false;
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}
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else
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{
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m_bLocked = true;
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}
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if( m_nReleaseNumber > m_nWaiterNumber )
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{
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m_nReleaseNumber = m_nWaiterNumber;
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}
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}
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void Condition::Signal( bool bSingle )
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{
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if( m_nWaiterNumber > m_nReleaseNumber )
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{
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if( true == bSingle )
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{
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m_nReleaseNumber++;
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}
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else
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{
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m_nReleaseNumber = m_nWaiterNumber;
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}
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if( true == m_bLocked )
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{
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SP_ACCESS( m_Semaphore )->Release();
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m_bLocked = false;
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}
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}
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}
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}} // namespace AVT::VmbAPI
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