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Dr-Plank: There's no one here Goofus has ed Hi Goofus -- do you like bridge? Dr-Plank: Hi Goofus -- do you like bridge?
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Dr-Plank: There's no one here Goofus has ed Hi Goofus -- do you like bridge? Dr-Plank: Hi Goofus -- do you like bridge? Goofus: Bridge? You mean that card game my gramma plays?
Goofus has left Can't say I liked him. New jersey chat Can't say I liked him. Gallant has ed Gallant: Hi Dr. Dr-Plank: Indeed Loser. Goofus: Loser. P Gallant: Hi Dr. Gallant: I like to read books on bridge. Dr-Plank has left I didn't get a chance to be more sycophantic!
Gallant: I didn't get a chance to be more nc chat room The chat room names will be listed lexicographically, and the name of each person chatting should be listed with each chat room, separated by a space. The order of that listing should be the order nc chat room which the chatters ed. The server then prompts the client for a name and then a chat room. Obviously it should error check including premature EOF.
One the person s the chat room, a line is chat gay english to all others in chaf chat room that the person has ed. Lines entered by the clients are sent to all the clients in the chat room. The server should cn any of clients, and should work seamlessly when clients leave, as Goofus, romo later Dr-Plank did above.
The server does not have to print any output, but it may -- I will not be testing what the server prints -- I nc chat room only test the behavior of the clients. Structure This lab is involved, and will use pthre, mutexes and condition variables. Suppose there are r chat rooms nc chat room c sexual chat sites. Specifically: There will be one thread that is spinning on a while loop, waiting for clients to attach to the socket.
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When it detects a client, it will create a client thread. There nc chat room be one thread for each chat room. That thread will typically be blocked on a condition variable unique to that chat room. When the condition variable is unblocked, xhat is meridian married chat indication that the server has received input from a client.
That input will be on a list. For each string on the list, the server thread adult chat quispamsis traverse all the clients and send the string to each client. When it is done processing the list, it should wait on the condition variable again.
There will be one thread for each client. That thread will typically be blocked reading from the socket. When it receives a line of text from the socket, it will construct the proper string from it, put that string onto the chat room's chat rooms qld, and al the chat room server.
Remember to protect data structures when you have to. For example, the clients and servers share the chat room's nc chat room. When the clients update the list and when the servers read the list and cat entries, those operations must be protected by a mutex. You should use fdopen twice on each connection. After that, the client thre only call fgets and the chat room thre call fputs and fflush.
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A subtle part of this lab nc chat room to deal with clients exiting at any point. That means you have to test the return values of caht fputsfgets and fflush calls and deal with them appropriately. I dealt be naughty live chat chesapeake virginia them as follows: If I catch an EOF while reading the client's info, I simply close the buffers and kill the client thread. After the client has ed the chat room, then chxt I detect EOF on a fgets call, then I close the input buffer.
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If the output buffer is girl chat avenue open and if the chat room thread is not currently trying to write to nc chat room, then I close the output buffer and remove the client from the chat room's list. Then I kill the client thread. If the chat room thread detects a problem on fputs or fflushthen I remove the client from the chat room's list and close the output buffer.
I rom mess with the client thread, since it should detect EOF on the fgets call and exit on its own.
You may want to draw yourself some pictures to help visualize the interactions between the client thre and the chat room thre. It gives a little more information as well. You may find it helpful to see how it works when you implement your own synchronization.
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The Gradescript The gradescript here is different. And please make sure that the client and server are both on our lab machines hydra, tesla. Gradescript will run nc chat room program laba-tester, which opens a nc chat room client connections, sends lines and tests the output. Since your server should be able to handle clients coming and going, you shouldn't have to start and stop your client between runs of gradescript -- discreet women want adult chat line start it once and that should suffice for all gradescript runs.
Now, a little detail on the internals. Gradescript runs a program called laba-tester, which should is called with the same arguments as gradescript.
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You should use laba-tester to help develop your server. Let's goths chat an easy example. Client leaves a room. Client writes a string. When a client c s a room r, you see the string "Event in Chat Room r: c has ed". Each client c2 attached to that nc chat room should receive a no email sex chat saying the client has ed.
The printout when clients leave is similar -- when they leave, you get "Event in Chat Room r: c has left", and then each client still attached to that room should get "Read Event From Client c2: c has left". As you can see, in the above example, clients Fiona and Mercutio the chat room "Art.
Test cases just test entering and leaving. Both clients read the line successfully, and then they exit. If you want to see the order of events, look at tmp-inputfile.
If you call laba-tester with a greater thanit will choose a nc chat room test case with the same distribution as above. Finally, when you get to the later chat gratis cases, you will see some complex behavior. When the tester writes lines of text to the server, it does not read them from the clients until one of the following: A ing event occurs.
A leaving event occurs. More than 10 consecutive talking events have occurred.
At that point, it re from all the clients, and double-checks the correctness and ordering of the output. It is entirely possible for the output order to differ from the input order, because the order is going to depend on which thre return chat with australian singles their fgets chaat in your server.
Note the order of the writing events: Tinky-Winky writes "There's no escape, I can't wait", and then Thor writes "To do what was right". However, the talk-server's thread for Thor got its line before the thread for Tinky-Winky, and so nc chat room of the three clients re Thor's line before Tinky-Winky's. That is fine, and your output does not have to match mine exactly, since mine may differ from run to run.
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However, each reading client has to receive the events in the same order relative to each other. The testing program tests to make sure this happens, so it will approve the chwt above. If, for example, Tito had printed out Tinky-Winky's line first while the other two printed out Thor's line first, the testing program would flag it as an error.