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/*
//
// Copyright 1997-2009 Torsten Rohlfing
//
// Copyright 2004-2010 SRI International
//
// This file is part of the Computational Morphometry Toolkit.
//
// http://www.nitrc.org/projects/cmtk/
//
// The Computational Morphometry Toolkit is free software: you can
// redistribute it and/or modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// The Computational Morphometry Toolkit is distributed in the hope that it
// will be useful, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with the Computational Morphometry Toolkit. If not, see
// <http://www.gnu.org/licenses/>.
//
// $Revision: 583 $
//
// $LastChangedDate: 2009-10-13 13:22:25 -0700 (Tue, 13 Oct 2009) $
//
// $LastChangedBy: torstenrohlfing $
//
*/
namespace
cmtk
{
ThreadSemaphore::ThreadSemaphore( const unsigned int initial )
{
this->m_Counter = initial;
pthread_mutex_init( &this->m_Mutex, NULL );
pthread_cond_init( &this->m_Condition, NULL );
}
ThreadSemaphore::~ThreadSemaphore()
{
pthread_mutex_destroy( &this->m_Mutex );
pthread_cond_destroy( &this->m_Condition );
}
void
ThreadSemaphore::Post( const unsigned int increment )
{
pthread_mutex_lock( &this->m_Mutex );
this->m_Counter += increment;
pthread_mutex_unlock( &this->m_Mutex );
pthread_cond_broadcast( &this->m_Condition );
}
void
ThreadSemaphore::Wait()
{
pthread_mutex_lock( &this->m_Mutex );
while ( !this->m_Counter )
pthread_cond_wait( &this->m_Condition, &this->m_Mutex );
--this->m_Counter;
pthread_mutex_unlock( &this->m_Mutex );
}
} // namespace cmtk
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