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threadpool.cpp
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106 lines (98 loc) · 2.4 KB
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#include "threadpool.h"
#include <deque>
#include <unistd.h>
ThreadPool::ThreadPool(int threadnum) :
started_(false), threadnum_(threadnum), threadlist_(), taskqueue_(),
mutex_(), condition_()
{
}
ThreadPool::~ThreadPool()
{
std::cout<< "Clean up the ThreadPool!" << std::endl;
Stop();
for(int i = 0; i < threadnum_; i++)
{
threadlist_[i]->join();
}
for(int i = 0; i < threadnum_; i++)
{
delete threadlist_[i];
}
threadlist_.clear();
}
//启动线程池
void ThreadPool::Start()
{
if(threadnum_ > 0)
{
started_ = true;
for(int i = 0; i < threadnum_; i++)
{
std::thread *pthread = new std::thread(&ThreadPool::ThreadFunc, this);
threadlist_.push_back(pthread);
}
} else
{
std::cout<< "ThreadPool: threadnum < 0!" << std::endl;
}
}
//暂停线程池
void ThreadPool::Stop()
{
started_ = false;
condition_.notify_all();
}
//添加任务
void ThreadPool::AddTask(Task task)
{
{
std::lock_guard<std::mutex> lock(mutex_);
taskqueue_.push(task);
}
//依次唤醒等待队列的线程
condition_.notify_one();
}
//线程池执行的函数
void ThreadPool::ThreadFunc()
{
std::thread::id tid = std::this_thread::get_id();
std::stringstream sin;
sin << tid;
std::cout<< "Worker thread is running! tid: " << tid << std::endl;
Task task;
while(started_)
{
task = NULL;
{
std::unique_lock<std::mutex> lock(mutex_);//unique_lock支持解锁又上锁的情况
while(taskqueue_.empty() && started_)
{
condition_.wait(lock);
}
if(!started_)
{
break;
}
std::cout<< "Thread wake up! tid: " << tid << std::endl;
std::cout<< "Taskqueue size: " << taskqueue_.size() << std::endl;
task = taskqueue_.front();
taskqueue_.pop();
}
if(task)
{
try
{
task();//task()中IO过程可以使用协程优化，让出CPU资源
} catch(std::bad_alloc& bad)
{
std::cerr << "Bad_alloc caught in ThreadPool::ThreadFunc task: " << bad.what() << std::endl;
while(true);
}
}
}
}
//获取线程数量
int ThreadPool::GetThreadNum()
{
return threadnum_;
}