Memlock #1
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(Probably fixes the ITS, definitely fixes a bug) when collapsing the root page, fixups of other cursors was incomplete.
Fix mdb_txn_begin(&read-only txn) calls. Test mdb_env_set_maxreaders(). Rename DBI open/close functions. Move mdb_dbi_close() out of txn.
Don't change mc_dbx because we would need to undo the change if the txn aborts. Make the fix (for get) match existing code for put.
Optimize mdb_page_search_root(PS_LAST) when cursor is already near last position, ignoring C_EOF flag for now.
Allow C_EOF flag to be stale
Fully revert the change to GET_MULTIPLE
Re-fix 6b1df0e from ITS#8406
This patch fixes liblmdb builds on Solaris and derivatives by defining _POSIX_PTHREAD_SEMANTICS
Set C_DEL flag on reinit'd subcursor
* Check NUMKEYS(), similar to f34b61f "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).
This checks XCURSOR_INITED() and fixes the mn_flags check.
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