15muduo_base库源码分析（六）

1.BoundedBlockingQueue（有界缓冲区）

BoundedBlockingQueue.h

// Use of this source code is governed by a BSD-style license
// that can be found in the License file.
//
// Author: Shuo Chen (chenshuo at chenshuo dot com)

#ifndef MUDUO_BASE_BOUNDEDBLOCKINGQUEUE_H
#define MUDUO_BASE_BOUNDEDBLOCKINGQUEUE_H

#include 
#include 

#include 
#include 
#include 

namespace muduo
{

template
class BoundedBlockingQueue : boost::noncopyable
{
 public:
  explicit BoundedBlockingQueue(int maxSize)
    : mutex_(),
      notEmpty_(mutex_),
      notFull_(mutex_),
      queue_(maxSize)
  {
  }

  void put(const T& x)
  {
    MutexLockGuard lock(mutex_);
    while (queue_.full())
    {
      notFull_.wait();
    }
    assert(!queue_.full());
    queue_.push_back(x);
    notEmpty_.notify(); // TODO: move outside of lock
  }

  T take()
  {
    MutexLockGuard lock(mutex_);
    while (queue_.empty())
    {
      notEmpty_.wait();
    }
    assert(!queue_.empty());
    T front(queue_.front());
    queue_.pop_front();
    notFull_.notify(); // TODO: move outside of lock
    return front;
  }

  bool empty() const
  {
    MutexLockGuard lock(mutex_);
    return queue_.empty();
  }

  bool full() const
  {
    MutexLockGuard lock(mutex_);
    return queue_.full();
  }

  size_t size() const
  {
    MutexLockGuard lock(mutex_);
    return queue_.size();
  }

  size_t capacity() const
  {
    MutexLockGuard lock(mutex_);
    return queue_.capacity();
  }

 private:
  mutable MutexLock          mutex_;
  Condition                  notEmpty_;
  Condition                  notFull_;
  boost::circular_buffer  queue_;
};

}

#endif  // MUDUO_BASE_BOUNDEDBLOCKINGQUEUE_H

BlockingQueue_bench.cc

#include 
#include 
#include 
#include 

#include 
#include 
#include 

2.BlockinngQueue（无界缓冲区）

BlockingQueue.h

// Use of this source code is governed by a BSD-style license
// that can be found in the License file.
//
// Author: Shuo Chen (chenshuo at chenshuo dot com)

#ifndef MUDUO_BASE_BLOCKINGQUEUE_H
#define MUDUO_BASE_BLOCKINGQUEUE_H

#include 
#include 

#include 
#include 
#include 

namespace muduo
{

template
class BlockingQueue : boost::noncopyable
{
 public:
  BlockingQueue()
    : mutex_(),
      notEmpty_(mutex_),
      queue_()
  {
  }

  void put(const T& x)
  {
    MutexLockGuard lock(mutex_);
    queue_.push_back(x);
    notEmpty_.notify(); // TODO: move outside of lock
  }

  T take()
  {
    MutexLockGuard lock(mutex_);
    // always use a while-loop, due to spurious wakeup
    while (queue_.empty())
    {
      notEmpty_.wait();
    }
    assert(!queue_.empty());
    T front(queue_.front());
    queue_.pop_front();
    return front;
  }

  size_t size() const
  {
    MutexLockGuard lock(mutex_);
    return queue_.size();
  }

 private:
  mutable MutexLock mutex_;
  Condition         notEmpty_;
  std::deque     queue_;
};

}

#endif  // MUDUO_BASE_BLOCKINGQUEUE_H

BlockingQueue_test.cc

#include 
#include 
#include 

#include 
#include 
#include 
#include 

class Test
{
 public:
  Test(int numThreads)
    : latch_(numThreads),
      threads_(numThreads)
  {
    for (int i = 0; i < numThreads; ++i)
    {
      char name[32];
      snprintf(name, sizeof name, "work thread %d", i);
      threads_.push_back(new muduo::Thread(
            boost::bind(&Test::threadFunc, this), muduo::string(name)));
    }
    for_each(threads_.begin(), threads_.end(), boost::bind(&muduo::Thread::start, _1));
  }

  void run(int times)
  {
    printf("waiting for count down latch\n");
    latch_.wait();
    printf("all threads started\n");
    for (int i = 0; i < times; ++i)
    {
      char buf[32];
      snprintf(buf, sizeof buf, "hello %d", i);
      queue_.put(buf);
      printf("tid=%d, put data = %s, size = %zd\n", muduo::CurrentThread::tid(), buf, queue_.size());
    }
  }

  void joinAll()
  {
    for (size_t i = 0; i < threads_.size(); ++i)
    {
      queue_.put("stop");
    }

    for_each(threads_.begin(), threads_.end(), boost::bind(&muduo::Thread::join, _1));
  }

 private:

  void threadFunc()
  {
    printf("tid=%d, %s started\n",
           muduo::CurrentThread::tid(),
           muduo::CurrentThread::name());

    latch_.countDown();
    bool running = true;
    while (running)
    {
      std::string d(queue_.take());
      printf("tid=%d, get data = %s, size = %zd\n", muduo::CurrentThread::tid(), d.c_str(), queue_.size());
      running = (d != "stop");
    }

    printf("tid=%d, %s stopped\n",
           muduo::CurrentThread::tid(),
           muduo::CurrentThread::name());
  }

  muduo::BlockingQueue queue_;
  muduo::CountDownLatch latch_;
  boost::ptr_vector threads_;
};

int main()
{
  printf("pid=%d, tid=%d\n", ::getpid(), muduo::CurrentThread::tid());
  Test t(5);
  t.run(100);
  t.joinAll();

  printf("number of created threads %d\n", muduo::Thread::numCreated());
}