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Unnecessary since these are DUPs, the key will always be the same

Avoid stomping on flags from 1st readhr invocation

Use GetProcAddress at runtime, avoid buildtime NTDLL link issues

This patch fixes liblmdb builds on Solaris and derivatives by defining
_POSIX_PTHREAD_SEMANTICS

This checks XCURSOR_INITED() and fixes the mn_flags check.

* Check NUMKEYS(), similar to f34b61f9
  "ITS#8722 fix FIRST_DUP/LAST_DUP cursor bounds check".
* Move XCURSOR_INITED() into XCURSOR_REFRESH().  This adds a check in
  mdb_cursor_put, below /* converted, write the original data first */.
* Factor mc_ki[] out to XCURSOR_REFRESH().
* Replace an mc_pg[] with mp which is equal (mdb_cursor_del0).

moneromooo-monero authored Jul 31, 2017 and Howard Chu committed Jul 31, 2017

used to open the previous meta page, in case the latest one
is corrupted

From https://github.com/LMDB/lmdb/pull/12

Set C_DEL flag on reinit'd subcursor

Re-fix 6b1df0e4 from ITS#8406

Attempt to stop liblmdb variants compiled with conflicting options
from using the lockfile at the same time and thus breaking it.

Simpler usage since it's only called once, rename to match new usage,
and drop 3 loop pessimizations which were optimizations 20 years ago.

This limits the namespace which the user can meddle with for
POSIX semaphores and Windows mutexes.  Their names change a
bit, they no longer have fixed lengths.

since it's variable size on Linux/glibc

Don't try to deref cursor page if txn's pagelist is empty

Fully revert the change to GET_MULTIPLE

GET_MULTIPLE was broken

Allow C_EOF flag to be stale

Optimize mdb_page_search_root(PS_LAST) when cursor is already near
last position, ignoring C_EOF flag for now.

Doesn't have POSIX robust mutexes - GNU userland on BSD kernel