ITK  4.1.0
Insight Segmentation and Registration Toolkit
itkThreadSupport.h
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00001 /*=========================================================================
00002  *
00003  *  Copyright Insight Software Consortium
00004  *
00005  *  Licensed under the Apache License, Version 2.0 (the "License");
00006  *  you may not use this file except in compliance with the License.
00007  *  You may obtain a copy of the License at
00008  *
00009  *         http://www.apache.org/licenses/LICENSE-2.0.txt
00010  *
00011  *  Unless required by applicable law or agreed to in writing, software
00012  *  distributed under the License is distributed on an "AS IS" BASIS,
00013  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  *  See the License for the specific language governing permissions and
00015  *  limitations under the License.
00016  *
00017  *=========================================================================*/
00018 #ifndef __itkThreadSupport_h
00019 #define __itkThreadSupport_h
00020 
00021 
00022 // This implementation uses a routine called SignalObjectAndWait()
00023 // which is only defined on WinNT 4.0 or greater systems.  We need to
00024 // define this symbol in order to get the prototype for the
00025 // routine. This needs to be done before we load any system headers.
00026 #ifdef ITK_USE_WIN32_THREADS
00027 #undef _WIN32_WINNT
00028 #define _WIN32_WINNT 0x0400
00029 #endif
00030 
00031 #if defined(ITK_USE_PTHREADS)
00032 #include <pthread.h>
00033 #elif defined(ITK_USE_WIN32_THREADS)
00034 #include "itkWindows.h"
00035 #include <winbase.h>
00036 #endif
00037 
00038 
00039 namespace itk
00040 {
00043 #if defined(ITK_USE_PTHREADS)
00044 #define ITK_MAX_THREADS              128
00045   typedef pthread_mutex_t MutexType;
00046   typedef pthread_mutex_t FastMutexType;
00047   typedef void *( * ThreadFunctionType )(void *);
00048   typedef pthread_t ThreadProcessIDType;
00049 #define ITK_THREAD_RETURN_VALUE  NULL
00050 #define ITK_THREAD_RETURN_TYPE   void *
00051 
00052 
00053 #elif defined(ITK_USE_WIN32_THREADS)
00054 
00055 #define ITK_MAX_THREADS              128
00056   typedef HANDLE                 MutexType;
00057   typedef CRITICAL_SECTION       FastMutexType;
00058   typedef LPTHREAD_START_ROUTINE ThreadFunctionType;
00059   typedef HANDLE                 ThreadProcessIDType;
00060 #define ITK_THREAD_RETURN_VALUE 0
00061 #define ITK_THREAD_RETURN_TYPE DWORD __stdcall
00062 
00063 #else
00064 
00065 #define ITK_MAX_THREADS              1
00066   typedef int     MutexType;
00067   typedef int     FastMutexType;
00068   typedef void ( *ThreadFunctionType )(void *);
00069   typedef int     ThreadProcessIDType;
00070 #define ITK_THREAD_RETURN_VALUE
00071 #define ITK_THREAD_RETURN_TYPE void
00072 
00073 #endif
00074 
00077 #if defined(ITK_USE_PTHREADS)
00078   typedef struct {
00079   pthread_cond_t m_ConditionVariable;
00080   } ConditionVariableType;
00081 #elif defined(ITK_USE_WIN32_THREADS)
00082   typedef struct {
00083   int m_NumberOfWaiters;                   // number of waiting threads
00084   CRITICAL_SECTION m_NumberOfWaitersLock;  // Serialize access to
00085                                            // m_NumberOfWaiters
00087 
00088   HANDLE m_Semaphore;                      // Semaphore to queue threads
00089   HANDLE m_WaitersAreDone;                 // Auto-reset event used by the
00090                                            // broadcast/signal thread to
00091                                            // wait for all the waiting
00092                                            // threads to wake up and
00093                                            // release the semaphore
00094 
00095   int m_WasBroadcast;                      // Used as boolean. Keeps track of whether
00096                                            // we were broadcasting or signaling
00097   } ConditionVariableType;
00098 #else
00099   typedef struct { } ConditionVariableType;
00100 #endif
00101 
00102 
00103 }
00104 #endif
00105