#include<chrono>

#include<iostream>

#include<mutex>

#include<random>

#include<queue>

#include<thread>

#include"../header/CThreadPool.hpp"

namespace

{

std::mutex mut;

size_t get()

{

using namespace std;

static mt19937 mu{static_cast<mt19937::result_type>(chrono::high_resolution_clock::now().time_since_epoch().count())};

return mu()%4;

}

std::size_t add_func(const std::size_t i)

{

using namespace std;

const auto sec{get()};

this_thread::sleep_for(chrono::seconds{sec});

lock_guard<mutex> lock{mut};

cout<<"add - thread "<<i<<" wait "<<sec<<" sec"<<endl;

return i;

}

std::size_t add_and_detach_func(const std::size_t i)

{

using namespace std;

const auto sec{get()};

this_thread::sleep_for(chrono::seconds{sec});

lock_guard<mutex> lock{mut};

cout<<"add_and_detach - thread "<<i<<" wait "<<sec<<" sec"<<endl;

return i;

}

}

int main()

{

using namespace std;

nThread::CThreadPool tp{4};

queue<nThread::CThreadPool::thread_id> que;

cout<<"stage 1"<<endl;

for(size_t i{0};i!=tp.size();++i)

tp.add_and_detach(add_and_detach_func,size_t(i));

tp.join_all(); //this will not block, because you use add_and_detach

cout<<"stage 2"<<endl;

for(size_t i{0};i!=tp.size();++i)

que.push(tp.add(add_func,size_t(i))); //tp will block here until add_and_detach_func complete

for(size_t i{0};i!=tp.size();++i)

{

tp.join(que.front()); //tp will block here until the i of thread complete

que.pop();

}

cout<<"stage 3"<<endl;

for(size_t i{0};i!=tp.size();++i)

tp.add_and_detach(add_and_detach_func,size_t(i));

tp.wait_until_all_usable(); //this will block until all detach threads complete add_and_detach_func

cout<<"stage 4"<<endl;

for(size_t i{0};i!=tp.size();++i)

tp.add(add_func,size_t(i)); //tp will not block here, because you join all thread

tp.join_all(); //tp will block here until add_func complete, it is same as

//for(size_t i(0);i!=tp.size();++i)

cout<<"stage 5"<<endl;

for(size_t i{0};i!=tp.size();++i)

tp.add(add_func,size_t(i));

//you don't need to call join_all to guarantee all threads are joining

//the destructor of CThreadPool will deal with this

//something else you have to notice

//CThreadPool::join_all will not block CThreadPool::add, and vice versa

}