tree de7a5638bd2dbea2586f609ec9645fd51cf87383
parent b40253a93ec4eb79c536403491f326bb56f72c02
author Jason Evans <je@fb.com> 1459388164 -0700
committer Jason Evans <jasone@canonware.com> 1462295072 -0700

Fix potential chunk leaks.

Move chunk_dalloc_arena()'s implementation into chunk_dalloc_wrapper(),
so that if the dalloc hook fails, proper decommit/purge/retain cascading
occurs.  This fixes three potential chunk leaks on OOM paths, one during
dss-based chunk allocation, one during chunk header commit (currently
relevant only on Windows), and one during rtree write (e.g. if rtree
node allocation fails).

Merge chunk_purge_arena() into chunk_purge_default() (refactor, no
change to functionality).