[GitHub] nickva opened a new pull request #883: Fix erlang time module compatibility

[gi...@git.apache.org]

nickva opened a new pull request #883: Fix erlang time module compatibility
URL: https://github.com/apache/couchdb/pull/883
 
 
   `now/0` is deprecated since Erlang 18.0, and a set of new time related functions
   are available.
   
   Usually `now/0` can be replaced with `os:timestamp/0`, however in some
   instances it was used effectively to produce monotonically incrementing values
   rather than timestamps. So a new `couch_time_compat` module was created to
   emulate 18.0+ `unique_integer/0,1` functionality, and code was upgraded to use it.
   
   Most functional changes are in couch_uuid module. There `now/0` was used both
   as a timestamp and for uniqueness. To emulate previous behavior, a local
   incrementing clock sequence is used. If `os:timestamp/0` does not advance since
   last call then the local clock is advanced by 1 microsecond and that's used to
   generate the next V1 UUIDs. As soon as os:timestamp/0` catches up, the local
   sequence reset to that latest value.
   
 
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