c++11 条件变量 生产者-消费者 并发线程

http://baptiste-wicht.com/posts/2012/04/c11-concurrency-tutorial-advanced-locking-and-condition-variables.html

 

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struct BoundedBuffer {     int* buffer;     int capacity;       int front;     int rear;     int count;       std::mutex lock;       std::condition_variable not_full;     std::condition_variable not_empty;       BoundedBuffer(int capacity) : capacity(capacity), front(0), rear(0), count(0) {         buffer = new int[capacity];     }       ~BoundedBuffer(){         delete[] buffer;     }       void deposit(int data){         std::unique_lock<std::mutex> l(lock);           not_full.wait(l, [this](){return count != capacity; });           buffer[rear] = data;         rear = (rear + 1) % capacity;         ++count;           not_empty.notify_one();     }       int fetch(){         std::unique_lock<std::mutex> l(lock);           not_empty.wait(l, [this](){return count != 0; });           int result = buffer[front];         front = (front + 1) % capacity;         --count;           not_full.notify_one();           return result;     } };

　　

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#include <iostream> #include <thread> #include <mutex> #include <condition_variable> //using namespace std;     void consumer(int id, BoundedBuffer& buffer){     for(int i = 0; i < 50; ++i){         int value = buffer.fetch();         std::cout << "Consumer " << id << " fetched " << value << std::endl;         std::this_thread::sleep_for(std::chrono::milliseconds(250));     } }   void producer(int id, BoundedBuffer& buffer){     for(int i = 0; i < 75; ++i){         buffer.deposit(i);         std::cout << "Produced " << id << " produced " << i << std::endl;         std::this_thread::sleep_for(std::chrono::milliseconds(100));     } }   int main(){     BoundedBuffer buffer(200);       std::thread c1(consumer, 0, std::ref(buffer));     std::thread c2(consumer, 1, std::ref(buffer));     std::thread c3(consumer, 2, std::ref(buffer));     std::thread p1(producer, 0, std::ref(buffer));     std::thread p2(producer, 1, std::ref(buffer));       c1.join();     c2.join();     c3.join();     p1.join();     p2.join();       return 0; }