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USSeth Noble
 

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    <p><img src="https://stackexchange.com/users/flair/1137202.png" width="208" height="58" alt="profile for Seth Noble on Stack Exchange, a network of free, community-driven Q&amp;A sites" title="profile for Seth Noble on Stack Exchange, a network of free, community-driven Q&amp;A sites" /></p> <p>Tips for Unix and Other Operating Systems:</p> <ul> <li><a href="http://tips.DataExpedition.com/hdrecovery.html" rel="nofollow noreferrer">Recover Failing Hard Drives</a></li> <li><a href="http://tips.DataExpedition.com/filesystems.html" rel="nofollow noreferrer">How Filesystems Work</a></li> <li><a href="http://tips.DataExpedition.com/memory.html" rel="nofollow noreferrer">How Memory Management Works</a></li> <li><a href="http://tips.DataExpedition.com/backups.html" rel="nofollow noreferrer">Recommendations for System Backups</a></li> </ul>
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    3. POHow can I remove my last commit in my local git repository
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      1. POUnkillable processes often hang for a long time
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      1. POUDP Connection between Android emulator / host
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      1. POProgram producing error when running in a VM
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    1. CORaising the priority "works" in the sense that it does raise the priority. That affects performance when multiple processes are contending for the same resources. You mentioned having problems when multiple processes are running, so that might help. The NIC operates independent of the CPU and system clock. There is no way to know exactly when it does anything. You might be able to look up the typical delay for your brand of NIC. But unless the driver specifically supports time stamping, the best you can know from user-space is when a packet is read from the socket and estimate from that.
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    2. COSorry, I was using the linux syntax. The windows equivalent would be `netstat -a -b -n -p udp -o`, or maybe leave out the `-b` to avoid the need for administrative rights. What about the call to `WaitOne` in `SocketBeginReceiveAsyncCallback`? Is there any chance that is blocking? [Looks like our posts crossed-paths.]
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    3. COThe loop is how you read more than one message. `select()` is intended to block on one or more descriptors until one or more have them becomes available. When it returns, you figure out from its return value and the descriptor sets which descriptors need attention and do whatever you need to do. Typically, you would loop on a control variable, such as `while (!Done)` which lets you break out when some quit condition occurs or if a fatal error ocurrs. Remember that `select()` modifies the descriptors sets, so you must reset them every time (or keep a spare copy).
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