text: /*=========================================================================
   *
   *  Copyright Insight Software Consortium
   *
   *  Licensed under the Apache License, Version 2.0 (the "License");
   *  you may not use this file except in compliance with the License.
   *  You may obtain a copy of the License at
   *
   *         http://www.apache.org/licenses/LICENSE-2.0.txt
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   *
   *=========================================================================*/
  /*=========================================================================
   *
   *  Portions of this file are subject to the VTK Toolkit Version 3 copyright.
   *
   *  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
   *
   *  For complete copyright, license and disclaimer of warranty information
   *  please refer to the NOTICE file at the top of the ITK source tree.
   *
   *=========================================================================*/
  #include "itkSimpleFastMutexLock.h"
  
  namespace itk
  {
  // Construct a new SimpleMutexLock
  SimpleFastMutexLock::SimpleFastMutexLock()
  {
    pthread_mutexattr_t mta;
    pthread_mutexattr_init(&mta);
    pthread_mutexattr_settype(&mta, PTHREAD_MUTEX_RECURSIVE);
    pthread_mutex_init(&(m_FastMutexLock), &mta);
  }
  
  // Destruct the SimpleMutexVariable
  SimpleFastMutexLock::~SimpleFastMutexLock()
  {
    pthread_mutex_destroy(&m_FastMutexLock);
  }
  
  // Lock the FastMutexLock
  void
  SimpleFastMutexLock::Lock() const
  {
    pthread_mutex_lock(&m_FastMutexLock);
  }
  
  // Non-blocking TryLock the FastMutexLock
  bool
  SimpleFastMutexLock::TryLock() const
  {
    const bool lockCaptured = (pthread_mutex_trylock(&m_FastMutexLock) == 0);
    /*
     * non-blocking lock of mutex
     * - if mutex is not already locked, you will obtain the lock & own the mutex, and return 0 immediately
     * - if mutex is already locked, pthread_mutex_trylock() will return immediately wth return value EBUSY
     */
    return lockCaptured;
  }
  
  // Unlock the FastMutexLock
  void
  SimpleFastMutexLock::Unlock() const
  {
    pthread_mutex_unlock(&m_FastMutexLock);
  }
  } // end namespace itk
  