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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 itkThreadSupport_h
#define itkThreadSupport_h
// This implementation uses a routine called SignalObjectAndWait()
// which is only defined on WinNT 4.0 or greater systems. We need to
// define this symbol in order to get the prototype for the
// routine. This needs to be done before we load any system headers.
#ifdef ITK_USE_WIN32_THREADS
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0501 //TBB 4.4 requires WinXP (0x0501 or greater)
#endif
#endif
#if defined(ITK_USE_PTHREADS)
#include <pthread.h>
#elif defined(ITK_USE_WIN32_THREADS)
#include "itkWindows.h"
#include <winbase.h>
#endif
namespace itk
{
/** Platform specific typedefs for simple types
*/
#if defined(ITK_USE_PTHREADS)
#define ITK_MAX_THREADS 128
typedef pthread_mutex_t MutexType;
typedef pthread_mutex_t FastMutexType;
typedef void *( * ThreadFunctionType )(void *);
typedef pthread_t ThreadProcessIdType;
#define ITK_THREAD_RETURN_VALUE NULL /* This is from a c library, and always needs to be NULL, not ITK_NULLPTR */
#define ITK_THREAD_RETURN_TYPE void *
#elif defined(ITK_USE_WIN32_THREADS)
#define ITK_MAX_THREADS 128
typedef HANDLE MutexType;
typedef CRITICAL_SECTION FastMutexType;
typedef unsigned(__stdcall * ThreadFunctionType)(void *);
typedef HANDLE ThreadProcessIdType;
#define ITK_THREAD_RETURN_VALUE 0
#define ITK_THREAD_RETURN_TYPE unsigned __stdcall
#else
#define ITK_MAX_THREADS 1
typedef int MutexType;
typedef int FastMutexType;
typedef void ( *ThreadFunctionType )(void *);
typedef int ThreadProcessIdType;
#define ITK_THREAD_RETURN_VALUE
#define ITK_THREAD_RETURN_TYPE void
#endif
/** Platform specific Conditional Variable typedef
*/
#if defined(ITK_USE_PTHREADS)
typedef struct {
pthread_cond_t m_ConditionVariable;
} ConditionVariableType;
#elif defined(ITK_USE_WIN32_THREADS)
typedef struct {
int m_NumberOfWaiters; // number of waiting threads
CRITICAL_SECTION m_NumberOfWaitersLock; // Serialize access to
// m_NumberOfWaiters
HANDLE m_Semaphore; // Semaphore to queue threads
HANDLE m_WaitersAreDone; // Auto-reset event used by the
// broadcast/signal thread to
// wait for all the waiting
// threads to wake up and
// release the semaphore
int m_WasBroadcast; // Used as boolean. Keeps track of whether
// we were broadcasting or signaling
} ConditionVariableType;
#else
typedef struct { } ConditionVariableType;
#endif
}
#endif
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