select - Socket data read wait time -

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i have application listening on multiple sockets using select. if start processing request came in socket , in meanwhile if request on socket b arrives want know how long socket b request had wait before it. since single threaded application cannot spawn new thread , go select monitor again , instantly start processing request socket b.

is there 'c' api available me metric or not possible get?

there no straightforward way how measure interval between 'data ready' time , 'data read' time because there not timestamp written data. situation more complex because stream oriented socket may receive several data segments till select closed , not interval should measured.

if application data processing longer packet processing in kernel can reasonable measurement in following way:

  • print current time , unique data id based on application protocol when select wakes due socket b data availability.
  • log packet received socket b. can use either network traffic capture tool wireshark or tcpdump. or can configure iptables firewall rule (if running on linux) target -j log.
  • write simple script/program correlates captured packets , application log , subtract received , start processing time.

of course idea above ignore kernel processing time. if need exact time have introduce new thread application.


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