c++ - Why this code doesn't work when "cout"s are commented? -


i'm writing server online game based on iocp, , core codes handling game message below:

cmessage ret; int now_roomnum = recv_msg->para1; int now_playernum = recv_msg->para2; /*if(true) {     cout<<"received game message: "<<endl;     cout<<"type2 = "<<recv_msg->type2;     cout<<" player_num = "<<now_playernum<<" msg= "<<recv_msg->msg<<endl;      cout<<endl; }*/  if(recv_msg->type2 == msg_game_operation) {     ret.type1 = msg_game;     ret.type2 = msg_game_operation;      while(game_host[now_roomnum].ready(now_playernum) == true)     {         ;     }     //cout<<"entered "<<now_playernum<<endl;      game_host[now_roomnum].setmessage(now_playernum, recv_msg->msg);     game_host[now_roomnum].setready(now_playernum, true);     game_host[now_roomnum].setused(now_playernum, false);      while(true)     {         bool tmp = game_host[now_roomnum].allready();         if(tmp == true)             break;     }      //cout<<"allready from"<<now_playernum<<endl;      string all_msg = game_host[now_roomnum].getallmessage();     game_host[now_roomnum].setused(now_playernum, true);      while(!game_host[now_roomnum].allused())     {         ;     }      //cout<<"allused "<<now_playernum<<endl;      entercriticalsection(&cs);     game_host[now_roomnum].clearready();     leavecriticalsection(&cs);      strcpy_s(ret.msg, all_msg.c_str());      //cout<<"return msg "<<now_playernum<<": "<<ret.msg<<endl;  }  return ret;

now, problem is: on pc, when cout commented above, game freezes @ once; when cancel comments, server works well.

what's more, when run server on laptop, goes fine, no matter whether comment cout or not. main difference between laptop , pc laptop's os windows 8.1, while pc windows 7.

i'm totally confused. of great if can tell me do. thank you!

looks multithreading issue.

by way see use critical section around clearready not when testing allready. call should wrapped (or, better, write lockedallready makes use of lock).


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