[sr-dev] [kamailio/kamailio] Microsleep (#2008)

[Paweł Pierścionek]

This is a ringless implementation of millisecond precision timer and millisecond async_sleep function.
I've added the functionality to the current async mod but this can me moved to a dedicated module.

For now only the async_ms_sleep is implemented but async_ms_route is just a few lines. 

Anyway how should I proceed with cleanup so this can be accepted ?

With millisecond precision sleep one can easily implement a leaky bucket request shaper that delays incoming requests to achieve perfect rate limits per customer/sip-trunk/whatever without dropping requests. No more spikes and no more 503s.

I've implemented external HTTP microservice that returns millisecond delays per dialog initiating request and tested it with SIPP with 3 flows/streams each with 250 CAPS.  No leaks nor other issues in 24hrs of testing. 


You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2008

-- Commit Summary --

  * ms resolution sleep
  * fix leak
  * add functions
  * register additional timer
  * don't forget the tail
  * timeradd expects normalized parameteres
  * Don not eat the chain links

-- File Changes --

    M src/modules/async/async_mod.c (83)
    M src/modules/async/async_sleep.c (210)
    M src/modules/async/async_sleep.h (8)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2008.patch
https://github.com/kamailio/kamailio/pull/2008.diff

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