Fix store multi-threading problem.

While running 'ensure_space', we can drop and retake the alloc lock.
This can enable other threads to perform store operations, which can
trigger reaps.

When reaps happen, fz_item's are discarded. This is particularly bad
when ensure_space happens to be holding onto a pointer to one (prev).

The fix, implemented here, is to move items out of the store list
(and hash table), and put them onto a local 'to_be_freed' list.

Once on this local list we can be sure that they won't be found
by other threads doing store operations, and they can be safely
freed from there (dropping/retaking the lock as required).

0 files changed, 0 insertions, 0 deletions