[gegl] (13 commits) Created branch threaded-base-classes

[Øyvind Kolås <ok src gnome org>]

The branch 'threaded-base-classes' was created.

Summary of new commits:

  e2a5bd0... Make GeglOperation base classes threadable
  3a779f6... op-point-composer3: make don't override parent class' proce
  c6a4c58... operation-composer3: bail earlier on 0x0 roi
  abea6c3... buffer: hold tile cow mutex only when updating linked list
  f372e56... XXX: do not commit, buffer: do not use hot tile
  0b9ac06... opt point-composer3 ops out of parallelization
  6f01798... operation: refactor in_place handling to take place in base
  8a01fff... tile_handler_cache: add debug print and bail if tile==NULL
  72a360b... tile: lock shuffling
  2da89e5... buffer: use tile-indice based mutexes for tile-writing
  5b74d67... apply-lens: opt out of parallelization
  aad3ae1... softglow: opt out of parallelization
  5d10a27... operation: do not auto-paralellize source ops