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PyProducerConsumer.h
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192 lines (150 loc) · 3.68 KB
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#ifndef _PYPRODUCER_H
#define _PYPRODUCER_H
#include "stdafx.h"
#include <queue>
namespace NppPythonScript
{
template<typename DataT>
class PyProducerConsumer
{
public:
PyProducerConsumer();
virtual ~PyProducerConsumer();
void startConsumer();
void stopConsumer();
bool consumerBusy();
protected:
bool produce(DataT data);
virtual void consume(DataT data) = 0;
virtual void queueComplete() { };
DWORD getConsumerThreadID() { return m_dwThreadId; };
private:
HANDLE m_queueMutex;
HANDLE m_dataAvailable;
HANDLE m_shutdown;
std::queue<DataT> m_queue;
DWORD m_dwThreadId;
HANDLE m_hThread;
bool m_consuming;
void consumer();
static void threadStart(PyProducerConsumer *instance);
};
template <typename DataT>
PyProducerConsumer<DataT>::PyProducerConsumer()
: m_hThread(NULL),
m_dwThreadId(NULL),
m_consuming(false)
{
m_queueMutex = CreateMutex(NULL, FALSE, NULL);
m_dataAvailable = CreateEvent(NULL, TRUE, FALSE, NULL);
m_shutdown = CreateEvent(NULL, TRUE, FALSE, NULL);
}
template <typename DataT>
PyProducerConsumer<DataT>::~PyProducerConsumer()
{
stopConsumer();
CloseHandle(m_queueMutex);
m_queueMutex = NULL;
CloseHandle(m_dataAvailable);
m_dataAvailable = NULL;
CloseHandle(m_shutdown);
m_shutdown = NULL;
}
template <typename DataT>
void PyProducerConsumer<DataT>::stopConsumer()
{
SetEvent(m_shutdown);
if (m_hThread)
{
WaitForSingleObject(m_hThread, INFINITE);
CloseHandle(m_hThread);
m_hThread = NULL;
}
}
template <typename DataT>
bool PyProducerConsumer<DataT>::produce(DataT data)
{
bool retVal = false;;
DWORD mutexResult = WaitForSingleObject(m_queueMutex, INFINITE);
if (mutexResult == WAIT_OBJECT_0)
{
try
{
m_queue.push(data);
retVal = true;
}
catch(...)
{
}
ReleaseMutex(m_queueMutex);
SetEvent(m_dataAvailable);
}
return retVal;
}
template<typename DataT>
void PyProducerConsumer<DataT>::startConsumer()
{
if (!m_hThread)
{
m_hThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)threadStart, this, 0, &m_dwThreadId);
}
}
template<typename DataT>
bool PyProducerConsumer<DataT>::consumerBusy()
{
return m_consuming;
}
template<typename DataT>
void PyProducerConsumer<DataT>::consumer()
{
HANDLE *waitHandles = new HANDLE[2];
waitHandles[0] = m_dataAvailable;
waitHandles[1] = m_shutdown;
bool queueEmpty;
bool shutdownSignalled = false;
while(!shutdownSignalled)
{
DWORD waitResult = WaitForMultipleObjects(2, waitHandles, false, INFINITE);
if (waitResult == WAIT_OBJECT_0 + 1 || waitResult == WAIT_ABANDONED_0 + 1) // Shutdown signalled
{
// Shutdown immediately
// An alternative would be to "finish up" the queue
// but we don't want to do that in PyScript - just close N++
// This is set to avoid the C4127 conditional expression constant warning if
// we use while(true)
shutdownSignalled = true;
break;
}
m_consuming = true;
DWORD queueAvailable = WaitForSingleObject(m_queueMutex, INFINITE);
if (queueAvailable == WAIT_OBJECT_0)
{
queueEmpty = false;
DataT data = m_queue.front();
m_queue.pop();
if (m_queue.empty())
{
queueEmpty = true;
ResetEvent(m_dataAvailable);
}
ReleaseMutex(m_queueMutex);
consume(data);
if (queueEmpty)
{
waitResult = WaitForSingleObject(m_dataAvailable, 0);
if (waitResult != WAIT_OBJECT_0)
{
m_consuming = false;
queueComplete();
}
}
}
}
}
template<typename DataT>
void PyProducerConsumer<DataT>::threadStart(PyProducerConsumer *instance)
{
instance->consumer();
}
}
#endif