ThreadPool类图
数据成员:
MutexLock mutex_:一个MutexLock类型的互斥变量mutex_
Condition cond_:一个Condition类型的条件变量cond_
string name_:线程池的名称
boost::ptr_vector<muduo::Thread>threads_:消费者线程队列threads_
std::deque<task. >queue_:任务队列queue_,其中task为一个执行任务的函数,生产者线程在queue_添加任务,所有threads_共享queue_
bool running_:running_表示线程池是否处于运行状态
typedef
typedef boost::function<void ()> Task:基于对象编程的回调函数
成员函数:
explicit ThreadPool(const string& name = string()):构造函数
~ThreadPool():析构函数
void start(int numThreads):启动线程池,其中有numThreads个线程
void stop():关闭线程池
void run(const Task& f):将任务task添加到线程中的任务队列queue_
void runInThread():线程池中的线程要执行的函数
Task take():获取任务
ThreadPool.h
#ifndef MUDUO_BASE_THREADPOOL_H
#define MUDUO_BASE_THREADPOOL_H
#include <muduo/base/Condition.h>
#include <muduo/base/Mutex.h>
#include <muduo/base/Thread.h>
#include <muduo/base/Types.h>
#include <boost/function.hpp>
#include <boost/noncopyable.hpp>
#include <boost/ptr_container/ptr_vector.hpp>
#include <deque>
namespace muduo
{
class ThreadPool : boost::noncopyable
{
public:
typedef boost::function<void ()> Task;
explicit ThreadPool(const string& name = string());
~ThreadPool();
void start(int numThreads);
void stop();
void run(const Task& f);
private:
void runInThread();
Task take();
MutexLock mutex_;
Condition cond_;
string name_;
boost::ptr_vector<muduo::Thread> threads_;
std::deque<Task> queue_;
bool running_;
};
}
#endif
ThreadPool.cc
#include <muduo/base/ThreadPool.h>
#include <muduo/base/Exception.h>
#include <boost/bind.hpp>
#include <assert.h>
#include <stdio.h>
using namespace muduo;
ThreadPool::ThreadPool(const string& name)
: mutex_(),
cond_(mutex_),
name_(name),
running_(false)
{
}
ThreadPool::~ThreadPool()
{
if (running_)
{
stop();
}
}
void ThreadPool::start(int numThreads)
{
assert(threads_.empty());
running_ = true;
threads_.reserve(numThreads);
for (int i = 0; i < numThreads; ++i)
{
char id[32];
snprintf(id, sizeof id, "%d", i);
threads_.push_back(new muduo::Thread(
boost::bind(&ThreadPool::runInThread, this), name_+id));
threads_[i].start();
}
}
void ThreadPool::stop()
{
{
MutexLockGuard lock(mutex_);
running_ = false;
cond_.notifyAll();
}
for_each(threads_.begin(),
threads_.end(),
boost::bind(&muduo::Thread::join, _1));
}
void ThreadPool::run(const Task& task)
{
if (threads_.empty())
{
task();
}
else
{
MutexLockGuard lock(mutex_);
queue_.push_back(task);
cond_.notify();
}
}
ThreadPool::Task ThreadPool::take()
{
MutexLockGuard lock(mutex_);
while (queue_.empty() && running_)
{
cond_.wait();
}
Task task;
if(!queue_.empty())
{
task = queue_.front();
queue_.pop_front();
}
return task;
}
void ThreadPool::runInThread()
{
try
{
while (running_)
{
Task task(take());
if (task)
{
task();
}
}
}
catch (const Exception& ex)
{
fprintf(stderr, "exception caught in ThreadPool %s\n", name_.c_str());
fprintf(stderr, "reason: %s\n", ex.what());
fprintf(stderr, "stack trace: %s\n", ex.stackTrace());
abort();
}
catch (const std::exception& ex)
{
fprintf(stderr, "exception caught in ThreadPool %s\n", name_.c_str());
fprintf(stderr, "reason: %s\n", ex.what());
abort();
}
catch (...)
{
fprintf(stderr, "unknown exception caught in ThreadPool %s\n", name_.c_str());
throw;
}
}
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