EventLoopThreadPool.cc

#include "EventLoopThreadPool.h"
#include "EventLoopThread.h"

EventLoopThreadPool::EventLoopThreadPool(EventLoop* baseLoop, const std::string& nameArg)
    : baseLoop_(baseLoop)
    , name_(nameArg)
    , started_(false)
    , numThreads_(0)
    , next_(0)
{
    
}

EventLoopThreadPool::~EventLoopThreadPool(){
    
}


void EventLoopThreadPool::start(const ThreadInitCallback& cb){
    started_ = true;
    for(int i = 0; i < numThreads_; i++){
        char buf[name_.size() + 32];
        snprintf(buf, sizeof buf, "%s%d",name_.c_str(),i);
        EventLoopThread* t = new EventLoopThread(cb, buf);
        threads_.push_back(std::unique_ptr<EventLoopThread>(t));
        loops_ .push_back(t->startLoop());  /* 底层创建线程，绑定一个新的EventLoop，并返回该loop的地址 */
    }

    /* 整个服务端只有一个线程，运行着baseloop */
    if (numThreads_ == 0 && cb)
    {
        cb(baseLoop_);
    }
    
} 

/* 如果工作在多线程中，baseloop 默认以轮询的方式分配channel给subloop  */
EventLoop* EventLoopThreadPool::getNextloop(){
    EventLoop* loop = baseLoop_;

    if(!loops_.empty()){     /* 通过轮询获取下一个处理事件的loop  */
        loop = loops_[next_];
        ++next_;
        if(next_ >= loops_.size()){
            next_ = 0;
        }
    }
    return loop;
}

std::vector<EventLoop*> EventLoopThreadPool::getAllloops(){
    if(loops_.empty()){
        return std::vector<EventLoop*>(1,baseLoop_); 
    }
    else{
        return loops_;
    }
}