Commits on May 28, 2024

1. Control SD sync/async behaviour with env var on QNX …

   This is a change intended for systems like QNX which do not generally
   have a service like netlink monitoring the network status that can
   easily be tied into.  This is not setup to be used/enabled on Linux/Android.
   
   SD will use the new asynchronous behaviour if the env var
   VSOMEIP_USE_ASYNCHRONOUS_SD is set.  If not set, SD will use a
   synchronous behaviour and only wait for the interface if the env var
   VSOMEIP_WAIT_FOR_INTERFACE exists.  The latter (without waiting) is very
   close to the upstream behaviour, the difference being that a callback is
   still sent to sd::start() from routing_manager_impl, rather than
   executing that code directly in routing_manager_impl.
   
   Notes:
   - mutexes
     - sd_impl::endpoint_ is now mutex protected
     - rm_impl::pending_sd_offers_mutex_ is a recursive mutex, as now it
       can be called in its own thread and the new thread in SD
   - There is no timeout on the waitfor.  The original implementation had a
     configurable timeout, however because timing out left us in an error
     state anyways, this timeout was removed (raised to
     numeric_limits<int>::max() = ~45 days, give or take.)

   

   kheaactua committed May 28, 2024
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