How to improve my code of chat room in C++? -

in code of chat room. use "while(true)" keep receive message, way waste cpu.how can improve code? have no idea it.

(this part of code)

void* cooloiclientsocket::recv_t(void* arg) {     std::string message;     cooloisocket* serversocket = static_cast<cooloisocket*>(arg);     //cooloiclientsocket *p = new cooloiclientsocket;     while(true)     {         if(recv(*serversocket,message))         {              std::cout << message << std::endl;         }         else             break;          sleep(1);     } }