looqs/shared/concurrentqueue.h

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C
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2022-04-14 14:57:16 +02:00
#ifndef CONCURRENTQUEUE_H
#define CONCURRENTQUEUE_H
#include <QList>
#include <QMutex>
#include <QSemaphore>
#define QUEUE_SIZE 10000
template <class T> class ConcurrentQueue : protected QList<T>
{
protected:
QMutex mutex;
QSemaphore avail{QUEUE_SIZE};
public:
void enqueue(const T &t)
{
avail.acquire(1);
QMutexLocker locker(&mutex);
QList<T>::append(t);
}
QVector<T> dequeue(int batchsize)
{
avail.release(batchsize);
// TODO: this sucks
QVector<T> result;
QMutexLocker locker(&mutex);
for(int i = 0; i < batchsize; i++)
{
result.append(QList<T>::takeFirst());
}
return result;
}
void enqueue(const QVector<T> &t)
{
QList<T> tmp(t.begin(), t.end());
avail.acquire(t.size());
QMutexLocker locker(&mutex);
QList<T>::append(tmp);
}
unsigned int remaining()
{
return QUEUE_SIZE - avail.available();
}
void clear()
{
QMutexLocker locker(&mutex);
QList<T>::clear();
avail.release(QUEUE_SIZE);
}
bool dequeue(T &result)
{
QMutexLocker locker(&mutex);
if(QList<T>::isEmpty())
return false;
avail.release(1);
result = QList<T>::takeFirst();
return true;
}
};
#endif // CONCURRENTQUEUE_H