aca-tasks/MonitorExample/main.cpp

/*
 ============================================================================
 Author        : G. Barlas
 Version       : 1.0, September 2015
               : 1.1, 16.12.2019 - Comments added (H. Weber)
               : 1.2, 27.01.2022 - Console output improved (H. Weber, S. Stahl)
 License       : V 1.0 released under the GNU GPL 3.0
 Description   : Producer/consumer example using a monitor.
 To compile    : qmake monitor2ProdCons.pro; make
 ============================================================================
 */
#include "monitor.h"
#include "producer.h"
#include "consumer.h"

#include <iostream>
#include <unistd.h>


using namespace std;


int produce(int id) {
    QMutex prodBinSem;
    static int i = 0;

    prodBinSem.lock();
    int j = i++;
    prodBinSem.unlock();

    printf("%3d produced by producer %d\n", j, id); // i to j
    return j;
}

void consume(int i, int ID) {
    printf("%3d consumed by consumer %d\n", i, ID);
}

int main(int argc, char *argv[]) {
    Monitor<int> m;

    int N = 4;		// Count of Producer objects (each is one QThread)
    int M = 3;		// Count of Consumer objects (each is one QThread)
    int numP = 10;	// Count of produced/consumed items for all Producer/Consumer threads combined

    printf("%d items produced by %d producers and consumed by %d consumers\n", numP, N, M);

    Producer<int>::initClass(numP, &m, &produce);
    Consumer<int>::initClass(numP, &m, &consume);

    Producer<int> *p[N];
    Consumer<int> *c[M];
    //Producers start producing
    for (int i = 0; i < N; i++) {
        p[i] = new Producer<int>(i);
        p[i]->start();
    }
    //Consumer start consuming
    for (int i = 0; i < M; i++) {
        c[i] = new Consumer<int>(i);
        c[i]->start();
    }

    //make finished threads wait?
    for (int i = 0; i < N; i++)
        p[i]->wait();
    for (int i = 0; i < M; i++)
        c[i]->wait();

    return 0;
}