pgsql-server/src backend/access/hash/README ba ...

CVSROOT:    /cvsroot
Module name:    pgsql-server
Changes by:    tgl@svr1.postgresql.org    03/09/04 19:06:27

Modified files:
    src/backend/access/hash: README hash.c hashinsert.c hashovfl.c
                             hashpage.c hashscan.c hashsearch.c
                             hashutil.c
    src/backend/storage/lmgr: lmgr.c
    src/include/access: hash.h
    src/include/storage: lmgr.h

Log message:
    Reimplement hash index locking algorithms, per my recent proposal to
    pghackers.  This fixes the problem recently reported by Markus Kr�utner
    (hash bucket split corrupts the state of scans being done concurrently),
    and I believe it also fixes all the known problems with deadlocks in
    hash index operations.  Hash indexes are still not really ready for prime
    time (since they aren't WAL-logged), but this is a step forward.