[lwip-commits] [SCM] lwIP - A Lightweight TCPIP stack branch, master, updated. ea94549cb2a44330d14a550437a70fb49b5f554e

[Joel Cunningham]

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- Log -----------------------------------------------------------------
commit ea94549cb2a44330d14a550437a70fb49b5f554e
Author: Joel Cunningham <address@hidden>
Date:   Wed Feb 17 16:33:35 2016 -0600

    Optimize lwip_selscan()
    
    This makes a couple of simple re-arrangements in lwip_selscan() that
    should improve performance in the following ways:
    
      1) The old code linearly walked all sockets to maxfd regardless of
         whether they were set in the fd set. The process involved
         acquiring sys arch protect, looking up the socket, and then
         checking if the socket was present in any of the fd sets. On
         systems with lots of sockets and a heavy SYS_ARCH_PROTECT
         infrastructure (a mutex) this can result in a lot of extra work.
         Now we skip this process for any fd that is not in the input sets
      2) If the socket from tryget_socket() is NULL we no longer continue
         and compare the input fd sets with a zeroed out set of events
      3) We no longer need to zero out our event sets because they are
         only accessed when tryget_socket() is successful
    
    lwip_selscan() is called at most once per select call and sometimes up to 
three times

-----------------------------------------------------------------------

Summary of changes:
 src/api/sockets.c |   62 +++++++++++++++++++++++++++++------------------------
 1 files changed, 34 insertions(+), 28 deletions(-)


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