C++ 11 查看硬件线程个数等信息

#include <iostream>
#include <thread>
#include <pthread.h>
#include <mutex>
using namespace std;

mutex mtx;

void showinfo()
{
lock_guard<mutex> lk(mtx);
cout<<"hardware thread is "<<thread::hardware_concurrency()<<endl;
cout<<"thread id is "<<pthread_self()<<endl;
cout<<"thread id is "<<this_thread::get_id()<<endl;

}

int main()
{
thread t1(showinfo);
{
lock_guard<mutex> lk(mtx);
cout<<"thread native handle is "<<t1.native_handle()<<endl;
}

t1.join();
return 0;
}