Created 2019-01-14T123857.rxp on branch 8.0.

subject: Pike 8.0: Thread safety, Process.run, pgsql, Calendar, tzdata2018i, describe_backtrace
from: eccaaf98
to: f8024eff
originator: Henrik Grubbström (Grubba) <grubba@grubba.org>
depends: 2018-11-02T144115
restart: true

Multiple fixes:

• Process.run: Accept empty string in modifiers as stdin

  Restores behaviour as of 7.8.

• Updated to tzdata2018i.

• Calendar.mkrules: Increase INF_YEAR from 2050 to 2150.

  Recent tzdata files (2018i) contain entries past 2050 (eg for Iran).

• Calendar: December is called Desembre in Catalan

• Thread: Added workaround for mutexkeys ending up in backtraces.

  Thread.Queue et al should now survive their controlling MutexKey
  having ended up in a backtrace.

• pgsql: Autoterminate dangling database connections at program exit.

• Thread.ResourceCount: Fixed mutex handling.

• pgsql: Avoid excessive latency on frequent ping()s.

• Protocols.HTTP.Session: Don't attempt to reuse SessionQuery objects.

  give_me_connection() now always returns a new SessionQuery object
  (albeit sometimes with a reused connection).

  This should alleviate issues with stuff being left around from
  previous queries.

• Protocols.HTTP.Session: Improved thread-safety.

  Fixes race-condition when multiple threads call give_me_connection()
  with the same url at the same time.

• Master: Multiple describe_backtrace() fixes.

  Do not use value identifiers that have not been defined in
  the visible backtrace.

  Fix clipped/canclip propagation.