| // |
| // Thread.cpp: implementation file |
| // |
| // Copyright (C) Walter E. Capers. All rights reserved |
| // |
| // This source is free to use as you like. If you make |
| // any changes please keep me in the loop. Email your changes |
| // to walt.capers@comcast.net. |
| // |
| // PURPOSE: |
| // |
| // To implement threading as a C++ object |
| // |
| // NOTES: |
| // This object supports two types of thread models, event driven and |
| // interval driven. Under the event driven model, a thread waits |
| // in a paused state until the member function Event is called. When |
| // the Event function is called the thread wakes up and calls OnTask. |
| // Under the interval driven model, the thread wakes up every |
| // m_dwIdle milli-seconds and calls OnTask. |
| // |
| // You can switch between the two models from within the same object. |
| // |
| // COMPILER NOTES: |
| // On Unix you must use -lpthread a -lrt |
| // On Windows you must specify threaded under C++ code generation |
| // |
| // REVISIONS |
| // ======================================================= |
| // Date: 10.24.07 |
| // Name: Walter E. Capers |
| // Description: File creation |
| // |
| // Date: 10.24.07 11:49 am |
| // Name: Walter E. Capers |
| // Description: Added SetIdle function to allow the idle time to be altered |
| // independent of the SetThreadType member function. |
| // Added sleep interval to Stop function. |
| // |
| // Date: 10.25.07 |
| // Name: Walter E. Capers |
| // Description: Added support for other non-windows platforms. |
| // |
| // Added static functions: ThreadIdsEqual and ThreadId. |
| // |
| // Added que for handling multiple events. |
| // |
| // Created the CEventClass and CMutexClass classes to facilitate |
| // platform independence. |
| // |
| // Date: 10.26.07 |
| // Name: Walter E. Capers |
| // Description: Made object production ready... |
| // Added more comments |
| // |
| // Addressed various issues with threads on UNIX systems. |
| // -- there was a defect in the Sleep function |
| // -- there was a defect in the main thread function THKERNEL |
| // , when transitioning between thread models the CEvent::Reset |
| // function was not being called when it was necessary resulting |
| // in a lock up. |
| // |
| // Transition between thread types also failed on WINDOWS since the Event |
| // member function was being called from within SetThreadType. This |
| // resulted in an Event usage error. To correct the problem m_event.Set |
| // is called instead. Also, eliminated unecessary logic. |
| // |
| // Got rid of OnStart, OnStop, OnDestroy... Could not override with a derived |
| // class, not sure why I will come back to in a later release. |
| // |
| // Changed default behavior of thread. If OnTask is not redefined in the derived |
| // class the default version now expects a CTask object. The Class for CTask |
| // is defined in thread.h. A class must be derived from CTask to use it in |
| // the default version of OnTask(LPVOID). |
| // |
| // Date: 11.01.07 |
| // Name: Walter E. Capers |
| // Description: I introduced more logic and ASSERTIONS to insure the integrity of CThread objects. |
| // Both the Homogeneous and Specialized thread types can be physically set using the |
| // SetThreadType member function. If the thread type is not set, the thread will |
| // determine its type based on calls to member functions; however, this does not |
| // apply to interval-based threads. Interval-based threads must be implicitly |
| // identified using the SetThreadType member function. The new integrity tests |
| // are implemented to insure usage consistency with a CThread object. |
| // |
| // New member functions AtCapacity and PercentCapacity were added to determine |
| // if a thread is truly busy. AtCapacity will return TRUE under one of two |
| // conditions: the thread is processing an event and its stack is full, the thread |
| // is not running. These new functions allow thread objects to be placed in arrays |
| // and tasked based on their workloads. |
| // |
| // The Event member function has been modified to verify that a thread is running |
| // before posting an event. This resolved a problem on SunOS were threads did not |
| // start right away; there was a small delay of a few milliseconds. |
| // |
| // Error flags are automatically reset when certain member functions are called this |
| // isolates error occurrences to specific call sequences. |
| // |
| // |
| // Date: 11.01.07 |
| // Name: Walter E. Capers |
| // Description: In THKernel, changed how events are released. Events are now released right after |
| // They are recieved. |
| |
| #include "Thread.h" |
| #ifdef USE_BEGIN_THREAD |
| #include <process.h> |
| #endif |
| |
| |
| |
| #ifndef WINDOWS |
| |
| #include <unistd.h> |
| #include <pthread.h> |
| |
| extern "C" |
| { |
| //int usleep(useconds_t useconds); |
| #ifdef NANO_SECOND_SLEEP |
| int nanosleep(const struct timespec *rqtp, struct timespec *rmtp); |
| #endif |
| } |
| |
| void Sleep( unsigned int milli ) |
| { |
| #ifdef NANO_SECOND_SLEEP |
| struct timespec interval, remainder; |
| milli = milli * 1000000; |
| interval.tv_sec= 0; |
| interval.tv_nsec=milli; |
| nanosleep(&interval,&remainder); |
| #else |
| usleep(milli*1000); |
| #endif |
| } |
| #endif |
| |
| #include <iostream> |
| using namespace std; |
| |
| /** |
| * |
| * _THKERNEL |
| * thread callback function used by CreateThread |
| * |
| * |
| **/ |
| #ifdef WINDOWS |
| #ifdef USE_BEGIN_THREAD |
| unsigned __stdcall |
| #else |
| DWORD WINAPI |
| #endif |
| #else |
| LPVOID |
| #endif |
| _THKERNEL( LPVOID lpvData /* CThread Object */ |
| ) |
| { |
| CThread *pThread = (CThread *)lpvData; |
| ThreadType_t lastType; |
| /* |
| * |
| * initialization |
| * |
| */ |
| |
| |
| pThread->m_mutex.Lock(); |
| pThread->m_state = ThreadStateWaiting; |
| pThread->m_bRunning = TRUE; |
| #ifndef WINDOWS |
| pThread->m_dwId = CThread::ThreadId(); |
| #endif |
| pThread->m_mutex.Unlock(); |
| |
| while( TRUE ) |
| { |
| lastType = pThread->m_type; |
| |
| if( lastType == ThreadTypeHomogeneous || |
| lastType == ThreadTypeSpecialized || |
| lastType == ThreadTypeNotDefined ) |
| { |
| if( ! pThread->m_event.Wait() ) // wait for a message |
| break; |
| pThread->m_event.Reset(); // message recieved |
| } |
| |
| if( ! pThread->KernelProcess() ) |
| break; |
| |
| |
| /*if( lastType == ThreadTypeHomogeneous || |
| lastType == ThreadTypeSpecialized || |
| lastType == ThreadTypeNotDefined ) |
| { |
| pThread->m_event.Reset(); |
| } */ |
| |
| if( pThread->m_type == ThreadTypeIntervalDriven ) |
| Sleep(pThread->m_dwIdle); |
| |
| } |
| |
| |
| pThread->m_mutex.Lock(); |
| pThread->m_state = ThreadStateDown; |
| pThread->m_bRunning = FALSE; |
| pThread->m_mutex.Unlock(); |
| |
| |
| #ifdef WINDOWS |
| return 0; |
| #else |
| return (LPVOID)0; |
| #endif |
| } |
| |
| /** |
| * |
| * FromSameThread |
| * determines if the calling thread is the same |
| * as the thread assoicated with the object |
| * |
| **/ |
| BOOL |
| CThread::FromSameThread() |
| { |
| ThreadId_t id = ThreadId(); |
| if( ThreadIdsEqual(&id,&m_dwId) ) return TRUE; |
| return FALSE; |
| } |
| |
| /** |
| * |
| * OnTask |
| * called when a thread is tasked using the Event |
| * member function |
| * |
| **/ |
| BOOL |
| CThread::OnTask( LPVOID lpvData /*data passed from thread*/ |
| ) |
| { |
| ASSERT(lpvData && m_type == ThreadTypeHomogeneous); |
| |
| if( m_type != ThreadTypeHomogeneous ) |
| { |
| cerr << "Warning CThread::OnTask:\n\tOnTask(LPVOID) called for a non-homogeneous thread!\n"; |
| return FALSE; |
| } |
| |
| ((CTask *)lpvData)->SetTaskStatus(TaskStatusBeingProcessed); |
| BOOL bReturn = ((CTask *)lpvData)->Task(); |
| ((CTask *)lpvData)->SetTaskStatus(TaskStatusCompleted); |
| |
| return bReturn; |
| } |
| |
| |
| |
| /** |
| * |
| * OnTask |
| * overloaded implementation of OnTask that |
| * takes no arguments |
| * |
| **/ |
| BOOL |
| CThread::OnTask() |
| { |
| ASSERT(m_type == ThreadTypeIntervalDriven); |
| if( m_type != ThreadTypeIntervalDriven ) |
| { |
| cerr << "Warning CThread::OnTask:\n\tOnTask() called for a non-event driven thread!\n"; |
| return FALSE; |
| } |
| |
| printf("\nthread is alive\n"); |
| |
| return TRUE; |
| } |
| |
| /** |
| * |
| * CEvent |
| * used to place tasks on the threads event queue |
| * wakes up thread. |
| * |
| **/ |
| BOOL |
| CThread::Event(CTask *pvTask /* data to be processed by thread */ |
| ) |
| { |
| m_mutex.Lock(); |
| |
| ASSERT(m_type == ThreadTypeHomogeneous || |
| m_type == ThreadTypeNotDefined ); |
| |
| try |
| { |
| if( FromSameThread() ) |
| { |
| throw "\n\tit is illegal for a thread to place an event on its own event stack!\n"; |
| } |
| |
| |
| // make sure that the thread is running |
| if( !m_bRunning && m_dwObjectCondition == NO_ERRORS ) |
| { |
| m_mutex.Unlock(); |
| PingThread(m_dwIdle*2); // wait two idle cycles for it to start |
| m_mutex.Lock(); |
| } |
| if( !m_bRunning ) // if it is not running return FALSE; |
| { |
| m_mutex.Unlock(); |
| return FALSE; |
| } |
| |
| |
| if( m_dwObjectCondition & ILLEGAL_USE_OF_EVENT ) |
| m_dwObjectCondition = m_dwObjectCondition ^ ILLEGAL_USE_OF_EVENT; |
| if( m_dwObjectCondition & EVENT_AND_TYPE_DONT_MATCH) |
| m_dwObjectCondition = m_dwObjectCondition ^ EVENT_AND_TYPE_DONT_MATCH; |
| |
| if( m_type != ThreadTypeHomogeneous && |
| m_type != ThreadTypeNotDefined ) |
| { |
| m_mutex.Unlock(); |
| m_dwObjectCondition |= ILLEGAL_USE_OF_EVENT; |
| m_dwObjectCondition |= EVENT_AND_TYPE_DONT_MATCH; |
| m_state = ThreadStateFault; |
| cerr << "Warning: invalid call to CEvent::Event(CTask *), thread type is not specialized\n"; |
| |
| return FALSE; |
| } |
| |
| m_type = ThreadTypeHomogeneous; |
| m_mutex.Unlock(); |
| |
| pvTask->SetId(&m_dwId); |
| if( ! Push((LPVOID)pvTask) ) |
| return FALSE; |
| |
| pvTask->SetTaskStatus(TaskStatusWaitingOnQueue); |
| m_event.Set(); |
| |
| } |
| catch (char *psz) |
| { |
| #ifdef WINDOWS |
| MessageBoxA(NULL,&psz[2],"Fatal exception CThread::CEvent",MB_ICONHAND); |
| exit(-1); |
| #else |
| cerr << "Fatal exception CThread::CEvent(CTask *pvTask):" << psz; |
| #endif |
| |
| } |
| return TRUE; |
| } |
| |
| /** |
| * |
| * Event |
| * used to place tasks on the threads event queue |
| * wakes up thread. |
| * |
| **/ |
| BOOL |
| CThread::Event(LPVOID lpvData /* data to be processed by thread */ |
| ) |
| { |
| |
| m_mutex.Lock(); |
| ASSERT( m_type == ThreadTypeSpecialized || |
| m_type == ThreadTypeNotDefined ); |
| try |
| { |
| if( FromSameThread() ) |
| { |
| throw "\n\tit is illegal for a thread to place an event on its own event stack!\n"; |
| } |
| } |
| catch (char *psz) |
| { |
| #ifdef WINDOWS |
| MessageBoxA(NULL,&psz[2],"Fatal exception CThread::CEvent",MB_ICONHAND); |
| exit(-1); |
| #else |
| cerr << "Fatal exception CThread::CEvent(LPVOID lpvData):" << psz; |
| #endif |
| |
| } |
| |
| // make sure that the thread is running |
| if( !m_bRunning && m_dwObjectCondition == NO_ERRORS ) |
| { |
| m_mutex.Unlock(); |
| PingThread(m_dwIdle*2); // wait two idle cycles for it to start |
| m_mutex.Lock(); |
| } |
| if( !m_bRunning ) // if it is not running return FALSE; |
| { |
| m_mutex.Unlock(); |
| return FALSE; |
| } |
| |
| if( m_dwObjectCondition & ILLEGAL_USE_OF_EVENT ) |
| m_dwObjectCondition = m_dwObjectCondition ^ ILLEGAL_USE_OF_EVENT; |
| if( m_dwObjectCondition & EVENT_AND_TYPE_DONT_MATCH) |
| m_dwObjectCondition = m_dwObjectCondition ^ EVENT_AND_TYPE_DONT_MATCH; |
| |
| if( m_type != ThreadTypeSpecialized && |
| m_type != ThreadTypeNotDefined ) |
| { |
| m_dwObjectCondition |= ILLEGAL_USE_OF_EVENT; |
| m_dwObjectCondition |= EVENT_AND_TYPE_DONT_MATCH; |
| cerr << "Warning: invalid call to CEvent::Event(LPVOID), thread type is not specialized\n"; |
| m_mutex.Unlock(); |
| return FALSE; |
| } |
| m_type = ThreadTypeSpecialized; |
| |
| m_mutex.Unlock(); |
| if( ! Push(lpvData) ) |
| { |
| return FALSE; |
| } |
| |
| m_event.Set(); |
| |
| return TRUE; |
| } |
| |
| |
| /** |
| * |
| * SetPriority |
| * sets a threads run priority, see SetThreadPriority |
| * Note: only works for Windows family of operating systems |
| * |
| * |
| **/ |
| void |
| CThread::SetPriority(DWORD dwPriority) |
| { |
| |
| #ifdef WINDOWS |
| SetThreadPriority(m_thread,dwPriority); |
| #endif |
| } |
| |
| |
| /** |
| * |
| * KernelProcess |
| * routes thread activity |
| * |
| **/ |
| BOOL |
| CThread::KernelProcess() |
| { |
| |
| m_mutex.Lock(); |
| m_state = ThreadStateBusy; |
| if( !m_bRunning ) |
| { |
| m_state = ThreadStateShuttingDown; |
| m_mutex.Unlock(); |
| return FALSE; |
| } |
| m_mutex.Unlock(); |
| |
| if( !Empty() ) |
| { |
| while( !Empty() ) |
| { |
| Pop(); |
| if( !OnTask(m_lpvProcessor) ) |
| { |
| m_mutex.Lock(); |
| m_lpvProcessor = NULL; |
| m_state = ThreadStateShuttingDown; |
| m_mutex.Unlock(); |
| return FALSE; |
| } |
| } |
| m_mutex.Lock(); |
| m_lpvProcessor = NULL; |
| m_state = ThreadStateWaiting; |
| } |
| else { |
| if( !OnTask() ) |
| { |
| m_mutex.Lock(); |
| m_state = ThreadStateShuttingDown; |
| m_mutex.Unlock(); |
| return FALSE; |
| } |
| m_mutex.Lock(); |
| m_state = ThreadStateWaiting; |
| } |
| |
| m_mutex.Unlock(); |
| |
| return TRUE; |
| } |
| |
| |
| /** |
| * |
| * GetEventsPending |
| * returns the total number of vents waiting |
| * in the event que |
| * |
| **/ |
| unsigned int |
| CThread::GetEventsPending() |
| { |
| unsigned int chEventsWaiting; |
| |
| m_mutex.Lock(); |
| chEventsWaiting = m_queuePos; |
| m_mutex.Unlock(); |
| |
| return chEventsWaiting; |
| } |
| |
| |
| /** |
| * |
| * CThread |
| * instanciates thread object and |
| * starts thread. |
| * |
| **/ |
| CThread::CThread(void) |
| :m_bRunning(FALSE) |
| #ifdef WINDOWS |
| ,m_thread(NULL) |
| #endif |
| ,m_dwId(0L) |
| ,m_state(ThreadStateDown) |
| ,m_dwIdle(100) |
| ,m_lppvQueue(NULL) |
| ,m_lpvProcessor(NULL) |
| ,m_chQueue(QUEUE_SIZE) |
| ,m_type(ThreadTypeNotDefined) |
| ,m_stackSize(DEFAULT_STACK_SIZE) |
| ,m_queuePos(0) |
| ,m_StopTimeout(30) |
| { |
| |
| m_dwObjectCondition = NO_ERRORS; |
| |
| m_lppvQueue = new LPVOID [QUEUE_SIZE]; |
| |
| if( !m_lppvQueue ) |
| { |
| m_dwObjectCondition |= MEMORY_FAULT; |
| m_state = ThreadStateFault; |
| return; |
| } |
| |
| if( !m_mutex.m_bCreated ) |
| { |
| perror("mutex creation failed"); |
| m_dwObjectCondition |= MUTEX_CREATION; |
| m_state = ThreadStateFault; |
| return; |
| } |
| |
| |
| if( !m_event.m_bCreated ) |
| { |
| perror("event creation failed"); |
| m_dwObjectCondition |= EVENT_CREATION; |
| m_state = ThreadStateFault; |
| return; |
| } |
| |
| |
| Start(); |
| |
| } |
| |
| |
| /** |
| * |
| * PercentCapacity |
| * returns a floating point value identifying |
| * the current workload of the thread |
| * |
| **/ |
| float |
| CThread::PercentCapacity() |
| { |
| float fValue = 0; |
| m_mutex.Lock(); |
| fValue = (float)m_queuePos/m_chQueue; |
| m_mutex.Unlock(); |
| return fValue; |
| } |
| |
| /** |
| * |
| * SetQueueSize |
| * changes the threads queue size |
| * |
| **/ |
| BOOL |
| CThread::SetQueueSize( unsigned int ch ) |
| { |
| LPVOID * newQueue = NULL; |
| |
| m_mutex.Lock(); |
| ASSERT(ch > m_queuePos); |
| |
| if( ch <= m_queuePos ) |
| { |
| cerr << "Warning CThread::SetQueueSize:\n\tthe new queue size is less than the number of tasks on a non-empty queue! Request ignored.\n"; |
| m_mutex.Unlock(); |
| return FALSE; |
| } |
| |
| newQueue = new LPVOID [ch]; |
| if( !newQueue ) |
| { |
| cerr << "Warning CThread::SetQueueSize:\n\ta low memory, could not reallocate queue!\n"; |
| m_mutex.Unlock(); |
| return FALSE; |
| } |
| |
| for( unsigned int i=0;i<m_queuePos; i++ ) |
| { |
| newQueue[i] = m_lppvQueue[i]; |
| } |
| |
| delete [] m_lppvQueue; |
| |
| m_chQueue = ch; |
| m_lppvQueue = newQueue; |
| |
| m_mutex.Unlock(); |
| |
| return TRUE; |
| } |
| |
| |
| |
| /** |
| * |
| * Empty |
| * returns a value of TRUE if there are no items on the threads que |
| * otherwise a value of FALSE is returned. |
| * |
| **/ |
| BOOL |
| CThread::Empty() |
| { |
| m_mutex.Lock(); |
| if( m_queuePos <= 0 ) |
| { |
| m_mutex.Unlock(); |
| return TRUE; |
| } |
| m_mutex.Unlock(); |
| return FALSE; |
| } |
| |
| |
| |
| /** |
| * |
| * Push |
| * place a data object in the threads que |
| * |
| **/ |
| BOOL |
| CThread::Push( LPVOID lpv ) |
| { |
| if( !lpv ) return TRUE; |
| |
| m_mutex.Lock(); |
| |
| if( m_queuePos+1 >= m_chQueue ) { |
| m_dwObjectCondition |= STACK_OVERFLOW; |
| m_mutex.Unlock(); |
| return FALSE; |
| } |
| if( m_dwObjectCondition & STACK_EMPTY ) |
| m_dwObjectCondition = m_dwObjectCondition ^ STACK_EMPTY; |
| |
| if( m_dwObjectCondition & STACK_OVERFLOW ) |
| m_dwObjectCondition = m_dwObjectCondition ^ STACK_OVERFLOW; |
| |
| m_lppvQueue[m_queuePos++] = lpv; |
| if( m_queuePos+1 >= m_chQueue ) |
| m_dwObjectCondition |= STACK_FULL; |
| |
| m_mutex.Unlock(); |
| return TRUE; |
| } |
| |
| |
| /** |
| * |
| * Pop |
| * move an object from the input que to the processor |
| * |
| **/ |
| BOOL |
| CThread::Pop() |
| { |
| |
| m_mutex.Lock(); |
| if( m_queuePos-1 < 0 ) |
| { |
| m_queuePos = 0; |
| m_dwObjectCondition |= STACK_EMPTY; |
| m_mutex.Unlock(); |
| return FALSE; |
| } |
| if( m_dwObjectCondition & STACK_EMPTY ) |
| m_dwObjectCondition = m_dwObjectCondition ^ STACK_EMPTY; |
| if( m_dwObjectCondition & STACK_OVERFLOW ) |
| m_dwObjectCondition = m_dwObjectCondition ^ STACK_OVERFLOW; |
| if( m_dwObjectCondition & STACK_FULL ) |
| m_dwObjectCondition = m_dwObjectCondition ^ STACK_FULL; |
| |
| m_queuePos--; |
| m_lpvProcessor = m_lppvQueue[m_queuePos]; |
| m_mutex.Unlock(); |
| return TRUE; |
| } |
| |
| |
| /** |
| * |
| * SetThreadType |
| * specifies the type of threading that is to be performed. |
| * |
| * ThreadTypeEventDriven (default): an event must be physically sent |
| * to the thread using the Event member |
| * function. |
| * |
| * ThreadTypeIntervalDriven : an event occurs automatically every |
| * dwIdle milli seconds. |
| * |
| **/ |
| void |
| CThread::SetThreadType(ThreadType_t typ, |
| DWORD dwIdle) |
| { |
| |
| try |
| { |
| if( FromSameThread() ) |
| { |
| throw "\n\tit is illegal for a thread to change its own type!\n"; |
| } |
| |
| |
| m_mutex.Lock(); |
| m_dwIdle = dwIdle; |
| |
| |
| if( m_type == typ ) { |
| m_mutex.Unlock(); |
| return; |
| } |
| if( m_dwObjectCondition & ILLEGAL_USE_OF_EVENT ) |
| m_dwObjectCondition = m_dwObjectCondition ^ ILLEGAL_USE_OF_EVENT; |
| if( m_dwObjectCondition & EVENT_AND_TYPE_DONT_MATCH ) |
| m_dwObjectCondition = m_dwObjectCondition ^ EVENT_AND_TYPE_DONT_MATCH; |
| |
| m_type = typ; |
| |
| |
| m_mutex.Unlock(); |
| m_event.Set(); |
| } |
| catch (char *psz) |
| { |
| #ifdef WINDOWS |
| MessageBoxA(NULL,&psz[2],"Fatal exception CThread::SetThreadType",MB_ICONHAND); |
| exit(-1); |
| #else |
| cerr << "Fatal exception CThread::SetThreadType(ThreadType_t typ):" << psz; |
| #endif |
| |
| } |
| } |
| |
| |
| /** |
| * |
| * Stop |
| * stop thread |
| * |
| **/ |
| BOOL |
| CThread::Stop() |
| { |
| try |
| { |
| if( FromSameThread() ) |
| { |
| throw "\n\tit is illegal for a thread to attempt to signal itself to stop!\n"; |
| } |
| |
| m_mutex.Lock(); |
| m_bRunning = FALSE; |
| m_mutex.Unlock(); |
| m_event.Set(); |
| |
| int ticks = (m_StopTimeout*1000)/100; |
| |
| for( int i=0; i<ticks; i++ ) |
| { |
| Sleep(100); |
| |
| m_mutex.Lock(); |
| if( m_state == ThreadStateDown ) |
| { |
| m_mutex.Unlock(); |
| return TRUE; |
| } |
| m_mutex.Unlock(); |
| |
| } |
| } |
| catch (char *psz) |
| { |
| #ifdef WINDOWS |
| MessageBoxA(NULL,&psz[2],"Fatal exception CThread::Stop",MB_ICONHAND); |
| exit(-1); |
| #else |
| cerr << "Fatal exception CThread::Stop():" << psz; |
| #endif |
| |
| } |
| return FALSE; |
| } |
| |
| |
| /** |
| * |
| * SetIdle |
| * changes the threads idle interval |
| * |
| **/ |
| void |
| CThread::SetIdle(DWORD dwIdle) |
| { |
| m_mutex.Lock(); |
| m_dwIdle = dwIdle; |
| m_mutex.Unlock(); |
| } |
| |
| /** |
| * |
| * Start |
| * start thread |
| * |
| **/ |
| BOOL |
| CThread::Start() |
| { |
| try |
| { |
| if( FromSameThread() ) |
| { |
| throw "\n\tit is illegal for a thread to attempt to start itself!\n"; |
| } |
| |
| |
| m_mutex.Lock(); |
| if( m_bRunning ) |
| { |
| m_mutex.Unlock(); |
| return TRUE; |
| } |
| |
| m_mutex.Unlock(); |
| |
| |
| if( m_dwObjectCondition & THREAD_CREATION ) |
| m_dwObjectCondition = m_dwObjectCondition ^ THREAD_CREATION; |
| |
| #ifdef WINDOWS |
| if( m_thread ) CloseHandle(m_thread); |
| #ifdef USE_BEGIN_THREAD |
| m_thread = (HANDLE )_beginthreadex(NULL,(unsigned int)m_stackSize,_THKERNEL,(LPVOID)this,0,&m_dwId); |
| #else |
| m_thread = CreateThread(NULL,m_stackSize ,_THKERNEL,(LPVOID)this,0,&m_dwId); |
| #endif |
| if( !m_thread ) |
| { |
| perror("thread creation failed"); |
| m_dwObjectCondition |= THREAD_CREATION; |
| m_state = ThreadStateFault; |
| return FALSE; |
| } |
| #else |
| pthread_attr_t attr; |
| |
| pthread_attr_init(&attr); |
| |
| #ifdef VMS |
| if( m_stackSize == 0 ) |
| pthread_attr_setstacksize(&attr,PTHREAD_STACK_MIN*10); |
| #endif |
| if( m_stackSize != 0 ) |
| pthread_attr_setstacksize(&attr,m_stackSize); |
| |
| int error = pthread_create(&m_thread,&attr,_THKERNEL,(LPVOID)this); |
| |
| if( error != 0 ) |
| { |
| m_dwObjectCondition |= THREAD_CREATION; |
| m_state = ThreadStateFault; |
| |
| #if defined(HPUX) || defined(SUNOS) || defined(LINUX) |
| switch(error)/* show the thread error */ |
| { |
| |
| case EINVAL: |
| cerr << "error: attr in an invalid thread attributes object\n"; |
| break; |
| case EAGAIN: |
| cerr << "error: the necessary resources to create a thread are not\n"; |
| cerr << "available.\n"; |
| break; |
| case EPERM: |
| cerr << "error: the caller does not have the privileges to create\n"; |
| cerr << "the thread with the specified attr object.\n"; |
| break; |
| #if defined(HPUX) |
| case ENOSYS: |
| |
| cerr << "error: pthread_create not implemented!\n"; |
| if( __is_threadlib_linked()==0 ) |
| { |
| cerr << "error: threaded library not being used, improper linkage \"-lpthread -lc\"!\n"; |
| } |
| break; |
| #endif |
| default: |
| cerr << "error: an unknown error was encountered attempting to create\n"; |
| cerr << "the requested thread.\n"; |
| break; |
| } |
| #else |
| cerr << "error: could not create thread, pthread_create failed (" << error << ")!\n"; |
| #endif |
| return FALSE; |
| } |
| #endif |
| } |
| catch (char *psz) |
| { |
| #ifdef WINDOWS |
| MessageBoxA(NULL,&psz[2],"Fatal exception CThread::Start",MB_ICONHAND); |
| #else |
| cerr << "Fatal exception CThread::Start():" << psz; |
| #endif |
| exit(-1); |
| } |
| return TRUE; |
| } |
| |
| /** |
| * |
| * AtCapacity |
| * returns TRUE if the threads queue is full, and the thread |
| * is busy processing an event or the thread is not running |
| * |
| **/ |
| BOOL |
| CThread::AtCapacity() |
| { |
| m_mutex.Lock(); |
| if( ((m_dwObjectCondition & STACK_OVERFLOW || |
| m_dwObjectCondition & STACK_FULL ) && |
| m_state == ThreadStateBusy) || !m_bRunning) |
| { |
| m_mutex.Unlock(); |
| return TRUE; |
| } |
| m_mutex.Unlock(); |
| return FALSE; |
| } |
| |
| /** |
| * |
| * ThreadState |
| * return the current state of the thread |
| * |
| **/ |
| ThreadState_t |
| CThread::ThreadState() |
| { |
| ThreadState_t currentState; |
| m_mutex.Lock(); |
| currentState = m_state; |
| m_mutex.Unlock(); |
| return currentState; |
| } |
| |
| /** |
| * |
| * ~CThread |
| * destructor. Stop should be called prior to destruction to |
| * allow for gracefull thread termination. |
| * |
| **/ |
| CThread::~CThread(void) |
| { |
| if( m_bRunning ) // gracefull termination |
| { |
| try |
| { |
| if( !Stop() ) |
| { |
| throw "\n\tthread failed to stop in a timely manner!\n"; |
| } |
| } |
| catch( char *psz ) |
| { |
| #ifdef WINDOWS |
| MessageBoxA(NULL,&psz[2],"Fatal exception CThread::Stop",MB_ICONHAND); |
| exit(-1); |
| #else |
| cerr << "Fatal exception CThread::Stop: " << psz; |
| #endif |
| } |
| } |
| #ifdef WINDOWS |
| CloseHandle(m_thread); |
| #endif |
| |
| delete [] m_lppvQueue; |
| } |
| |
| |
| /** |
| * |
| * PingThread |
| * used to determine if a thread is running |
| * |
| **/ |
| BOOL |
| CThread::PingThread(DWORD dwTimeout /* timeout in milli-seconds */ |
| ) |
| { |
| DWORD dwTotal = 0; |
| |
| while(TRUE) |
| { |
| if( dwTotal > dwTimeout && dwTimeout > 0 ) |
| return FALSE; |
| m_mutex.Lock(); |
| if( m_bRunning ) |
| { |
| m_mutex.Unlock(); |
| return TRUE; |
| } |
| dwTotal += m_dwIdle; |
| m_mutex.Unlock(); |
| Sleep(m_dwIdle); |
| } |
| |
| return FALSE; |
| } |
| |
| /** |
| * |
| * WaitTillExit |
| * blocks caller until thread exits |
| * |
| **/ |
| void |
| CThread::WaitTillExit() |
| { |
| |
| /* |
| * |
| * prevent users from calling this function from within the same thread |
| * of execution |
| * |
| */ |
| try |
| { |
| if( FromSameThread() ) |
| throw "\n\tthis function can not be called from within the same thread!\n"; |
| |
| |
| |
| |
| if( !m_bRunning ) return; |
| |
| |
| #ifdef WINDOWS |
| WaitForSingleObject(m_thread,INFINITE); |
| #else |
| LPVOID lpv; |
| |
| pthread_join(m_thread,&lpv); |
| #endif |
| } |
| catch( char *psz ) |
| { |
| #ifdef WINDOWS |
| MessageBoxA(NULL,&psz[2],"Fatal exception CThread::WaitTillExit",MB_ICONHAND); |
| exit(-1); |
| #else |
| cerr << "Fatal exception CThread::WaitTillExit: " << psz; |
| #endif |
| |
| } |
| } |
| |
| |
| |
| |