[lwip-devel] [bug #48568] timeouts does not support late firing properly

[Sylvain Rochet]

URL:
  <http://savannah.nongnu.org/bugs/?48568>

                 Summary: timeouts does not support late firing properly
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: gradator
            Submitted on: Wed 20 Jul 2016 10:07:28 AM GMT
                Category: None
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 2.0.0 Beta2
            lwIP version: git head

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Details:

With the current code, timeouts get delayed when we are in a debugger
breakpoint and sys_now() might continues running while we are stopped (e.g.
when it uses a clock source from an OS which does not stop).

sys_check_timeouts() increases timeouts_last_time only by the expired
timeout's time. If that handler restarts a timeout (as is the case for all
lwIP-internal timers), it gets an addditional delay of the elapsed time in the
debugger stop period, meaning if we stopped for 2 minutes, the timer will get
an extra 2 minutes delay.




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