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POSend/Recv Socket Blocking Issues
 

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  1. POSend/Recv Socket Blocking Issues
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    <p>another question about my beloved sockets. I'll first explain what my case is. After that I will tell you whats bothering me.</p> <p>I have a client and a server. Both Applications are written in C++ with the winsock2 implementation. The connection runs over TCP and WLAN. WLan is very important, because its probably causing the issue and is definetly going to be the communicationchannel.</p> <p>I'm connecting two sockets to the server. A SendSocket and a ReceiveSocket. I'm constantly sending video data to the server through the sendsocket. The data is processed and gets send back to the client and gets displayed. Each socket got his own thread.</p> <p>The Videodata is encoded, so I achieve like 500kB/s. Lets see this rate as fixed, without explanation.</p> <p>Perfect communication viewed by the client:</p> <pre><code>Send Data Recv Data Send Data Recv Data ... </code></pre> <p>This is for like 100 frames the case.</p> <p>But every couple of frames, the stream freezes for like 4 frames and continues after that. (4 frames are like 500ms)</p> <p>Thats the issue, i'm facing.</p> <p>What happens to the stream is the following:</p> <pre><code>Send Data Recv Data Send Data Send Data Send Data1 -&gt; blocked send Recv Data Recv Data Send Data2 -&gt; not blocked anymore. </code></pre> <p>The Data gets properly sent on server side.</p> <p>Since WLan is not duplex (as far as I know), I thought, that the send calls are prioritized for some reason. And after that the Receive calls are prioritized, so the send call blocks until the recv calls are done.</p> <p>Maybe you can tell me, what is happening in the lower layer, which could cause the problem. Btw. I'm definetly not sure, if its not just a bandwidth issue, but I thought WLAN should be able to handle 500kB/s. This 500kB/s are both upstream and downstream together. Important notice: If I set the framerate to a factor of 1/5, it does not fix the issue.</p> <p>I know it's hard to fix this issue with this insight. I would be happy, if you could share your knowledge, so I may be able to fix it myself. </p> <p>EDIT: Its perfectly fine, if the client recv hangs a litte. But it must not block the send. The server needs data continuosly.</p>
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