MDB_txn.mt_toggle: Use (mt_txnid & 1) instead.
Drop error checks which will be repeated.
mdb_cursor_set(): Turn assert into if/return to match the above.
mdb_cursor_del(): 'flags' are now used as bitflags.
Only named DBs can have DB_STALE, and they do not use MDB_PS_MODIFY.
Replace magic key values with flags. Drop duplicated comments at
mdb_page_search_root() vs. mdb_page_search(), and rephrase.
Catch malloc error.
Fix hunt for dirty vs spilled pages: Don't leave x at a deleted pageno.
Cleanup: Factor out variables, squash pages already marked for deletion.
Fix description & code: Also ignore dirty pages hidden by
spilled pages, as they won't merge into our dirty_list.
Update it in mdb_page_flush() instead of mdb_page_spill().
Writer threads do their own wait using select/poll instead of
asking the listener thread. Eliminates one mutex+one condvar
per conn plus multiple wakeups of the listener thread. Also
fixes writetimeout to wait an exact time, instead of the
approximation used in the listener thread.
Note: I could not test the MozNSS patch due to the absence of
NSS PEM support on my machine. Given the review comments in
https://bugzilla.mozilla.org/show_bug.cgi?id=402712 I doubt that
trustworthy PEM support will be appearing for MozNSS any time soon.
The patch unconditionally enabled DHparams, which is a significant
change of behavior. Reverting to previous behavior, which only enables
DH use if a DHparam file was configured.
If a DHParamFile or olcDHParamFile is specified, then it will be used,
otherwise a hardcoded 1024 bit parameter will be used. This allows the use of
larger parameters; previously only 512 or 1024 bit parameters would ever be
used.
If a DHParamFile or olcDHParamFile is specified then it will be loaded. This
allows use of DHE/EDH cipher suites which was previously impossible with
GnuTLS.
