关于多线程的消费者生产者模型

这几天，勉强看了C++的多线程的知识，对多线程有了一定的了解，然后在多次测试下写了消费者和生产者的模型。

好了，直接贴代码；

#include <windows.h>
#include <mutex>
#include <condition_variable>
#include <iostream>
#include <thread>

using namespace std;

static const int kItemRepositorySize = 10;
static const int kItemsToProduce = 1000;
struct Item
{
    int item_buffer[kItemRepositorySize];
    UINT write_position = 0;
    UINT read_position = 0;
    UINT produce_list = 0;
    UINT consume_list = 0;
    mutex mtx;
    mutex produce_mtx;
    mutex consume_mtx;
    condition_variable not_full;
    condition_variable not_empty;
}item;
//static Item item;
void produce_do(int i){
    unique_lock<mutex> lock(item.mtx);
    while ((item.write_position + 1) % kItemRepositorySize == item.read_position)
    {
        cout << "wait for the consume!" << endl;
        (item.not_full).wait(lock);
    }
    item.item_buffer[item.write_position] = i;
    item.write_position++;
    if (item.write_position == kItemRepositorySize)
        item.write_position = 0;
    item.not_empty.notify_all();
    lock.unlock();
}
void produce(){

    while (true)
    {
        unique_lock<mutex> lock(item.produce_mtx);
        if (item.produce_list < kItemsToProduce)
            produce_do(item.produce_list);
        else
        {
            break;
        }
        item.produce_list++;
        lock.unlock();
    }


}
void consume_do(){
    unique_lock<mutex> lock(item.mtx);
    while (item.read_position == item.write_position)
    {
        cout << "it's time to produce!";
        (item.not_empty).wait(lock);
    }
    cout << "the prodece is :" << item.item_buffer[item.read_position] << endl;
    item.read_position++;
    if (item.read_position == kItemRepositorySize)
        item.read_position = 0;
    item.not_full.notify_all();
    lock.unlock();
}
void consume(){
    while (true)
    {
        unique_lock<mutex> lock(item.consume_mtx);
        if (item.consume_list < kItemsToProduce)
            consume_do();
        else
            break;
        item.consume_list++;
        lock.unlock();
    }


}
int main(){
    //Item ItemRepository;
    //cout << ItemRepository.read_position;
    thread producer1(produce);
    thread producer2(produce);
    thread consumer1(consume);
    thread consumer2(consume);
    producer1.join();
    producer2.join();
    consumer1.join(); consumer2.join();
    return 0;
}

这是我所编得程序，在vs2015上已经测试过了；

有什么不懂的可以私信我；