aca-tasks/MonitorExample/consumer.cpp

#include "consumer.h"

template<typename T> QSemaphore Consumer<T>::numProducts;
template<typename T> Monitor<T> *Consumer<T>::mon;
template<> void (*Consumer<int>::consume)(int, int) = NULL;

//---------------------------------------
template<typename T> void Consumer<T>::initClass(int numP, Monitor<T> *m, void (*cons)(T, int)) {
    numProducts.release(numP);
    mon = m;
    consume = cons;
}
//---------------------------------------

//Semaphore with Number of Resources -> consume N Resources
//get spot of item in queue, take item, activate producers
//process item
template<typename T> void Consumer<T>::run() {
    while (numProducts.tryAcquire()) {	// While not all numProducts are consumed:
        T* aux = mon->canGet();			//   Get pointer to item in itemQ
        T item = *aux;					//   Take the item out of itemQ
        mon->doneGetting(aux);			//   Give info to producer threads
        (*consume)(item,ID);				//   Consume one item
    }
}
//---------------------------------------