#include <iostream>
#include "tbb/concurrent_queue.h"
#include <thread>
using namespace std;
void worker1();
void worker2();
void worker3();

void consumer();

tbb::concurrent_queue<int> pq;
int main(){
    thread t1(worker1);
    t1.detach();
    thread t2(worker2);
    t2.detach();
    thread t3(worker3);
    t3.detach();
    thread t4(consumer);
    t4.detach();
    while(true);
}


void worker1(){
    while(true)
        pq.push(1);
}

void worker2(){
    while(true)
        pq.push(2);
}

void worker3(){
    while(true)
        pq.push(3);
}

void consumer(){
    int i;
    while(pq.try_pop(i))
        cout<<i<<endl;
}

result:结果比较均匀（截取的中间结果）

1
2
1
3
2
1
3
2
1
2
1
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
1
2
3
2
1
3
1
2
3
2
1
3
2
1
3