Partially revert 47f6aec6
Was using RANGE_FIRST/RANGE_LAST on an IDL known to *not* be a range.

Silence warnings, fix broken MinGW64 definitions, etc.

Init malloc'd memory by default, use #MDB_NOMEMINIT to disable.
Bump version to 0.9.10

Initialize unused portions of DB pages, for security or to silence
checkers like Purify and Valgrind. Like BDB configure --enable-umrw.

A node may need room for [key, subpage with 2 items] = 3 keys.

Use DB page size = min(32k, OS pagesize).  Previous limit was 8k
(MDB_MINKEYS*MDB_PAGESIZE).

Handle DB pagesize < OS pagesize. That's an I/O pessimization,
but transactions remain atomic: Only writing the MDB_meta must
be atomic, and it fits in one OS page.

Don't truncate desired subpage size: Asssign it to a size_t
(mv_size), not an uint16_t (mp_upper).

Skip cursors that aren't as deep as current cursor

DN notfound is authoritative, don't ignore the result

Update sections 6.2.2.1, 6.2.3.3

Closing a connection can abandon its ops without going thru the threadpool,
so make sure to lock the si_ops_mutex before walking the list.

Jorge Perez Burgos authored 11 years ago and Howard Chu committed 11 years ago

Don't lock other threads while trying to connect to remote node.

Introduced in commit 48cdd54d

Tweak split_indx check, go one slot further.

In d8eccb35

Return the environment's filedescriptor. Useful when the caller
is doing their own locking.

USE_POSIX_SEM must define USE_HASH