/usr/include/ITK-4.5/itkConditionVariable.h is in libinsighttoolkit4-dev 4.5.0-3.
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*
* 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.
*
*=========================================================================*/
#ifndef __itkConditionVariable_h
#define __itkConditionVariable_h
#include "itkConfigure.h"
#include "itkMutexLock.h"
#include "itkLightObject.h"
namespace itk
{
/** \class ConditionVariable
* \brief A thread synchronization object used to suspend execution until some
* condition on shared data is met.
*
* A thread calls Wait() to suspend its execution until the condition is
* met. Each call to Signal() from an executing thread will then cause a single
* waiting thread to be released. A call to Signal() means, "signal
* that the condition is true." Broadcast() releases all threads waiting on
* the condition variable.
*
* The ITK ConditionVariable implementation is consistent with the standard
* definition and use of condition variables in pthreads and other common
* thread libraries.
*
* IMPORTANT: A condition variable always requires an associated SimpleMutexLock
* object. The mutex object is used to avoid a dangerous race condition when
* Wait() and Signal() are called simultaneously from two different
* threads.
*
* On systems using pthreads, this implementation abstract the
* standard calls to the pthread condition variable. On Win32
* systems, there is no system provided condition variable. This
* class implements a condition variable using a critical section, a
* semphore, an event and a number of counters. The implementation is
* almost an extract translation of the implementation presented by
* Douglas C Schmidt and Irfan Pyarali in "Strategies for Implementing
* POSIX Condition Variables on Win32". This article can be found at
* http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
*
* \ingroup ITKCommon
*/
class ITKCommon_EXPORT ConditionVariable:public LightObject
{
public:
/** Standard class typedefs. */
typedef ConditionVariable Self;
typedef LightObject Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(ConditionVariable, LightObject);
/** Suspend execution of this thread until the condition is signaled. The
* argument is a SimpleMutex object that must be locked prior to calling
* this method. */
void Wait(SimpleMutexLock *mutex);
/** Signal that the condition is true and release one waiting thread */
void Signal();
/** Signal that the condition is true and release all waiting threads */
void Broadcast();
protected:
ConditionVariable();
~ConditionVariable();
private:
ConditionVariable(const Self & other);
const Self & operator=(const Self &);
ConditionVariableType m_ConditionVariable;
};
} // end namespace itk
#endif
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