UDP programming

This is a discussion on UDP programming within the Networking/Device Communication forums, part of the General Programming Boards category; Hi! I have some doubts about UDP programming. Iīve been trying to find answers, but couldīt find . Any link ...

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    Registered User Mortissus's Avatar
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    UDP programming

    Hi! I have some doubts about UDP programming. Iīve been trying to find answers, but couldīt find . Any link or response is much appreciated!

    1) Can I send and receive using the same socket in multithread? Must I use semaphores?

    2) If two hosts send something at the same time, both the datagrams will be sent, or they will be dropped? I know that UDP is a little unreliable, but can this kind of error occur, or Ethernet protocol deals with it?

    Again, thanks any help.

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    Quote Originally Posted by Mortissus

    2) If two hosts send something at the same time, both the datagrams will be sent, or they will be dropped? I know that UDP is a little unreliable, but can this kind of error occur, or Ethernet protocol deals with it?
    Do you mean 2 hosts each sending a datagram to each other? In that case both would be receiveve each others datagram.

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    To the first question:

    You don't need external synchronization just to send() and recv() in multiple threads on the same socket, but you'll likely sync. some at some point.

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    Registered User Mortissus's Avatar
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    Thanks for the answer!

    I will try to better explain the second question. Is UDP safe against collision (physical level)? I need to know what kind of errors can I have with UDP, that I do not have with TCP, besides datagrams dropped and arriving out of order. What I must consider when programming UDP, that I do not need to worry with TCP.

    As always, thanks any kind of help.

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    Other then datagrams ariving out of order and being dropped they can be corupted or duplicated.
    If both hosts send a datagram they wont collide, the router(s) will still foreward both allthoug neither is guaranteed to arive and each host may not receive the others datagram at EXACLY the same time.

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    Ok! Thanks very much!

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