tdb_chainlock - lock a group of keys tdb_chainunlock - unlock a previ-
ously locked group of keys
int tdb_chainlock(TDB_CONTEXT *tdb, TDB_DATA key);
void tdb_chainunlock(TDB_CONTEXT *tdb, TDB_DATA key);
tdb_chainlock is a low-level function used to lock a particular key
(and a number of other keys) without any checking: any other process
attempting to perform tdb operations on those keys will block until
tdb_chainunlock is called.
It is the user's responsibility to ensure that they do not deadlock the
database using these functions: something which is impossible using the
other access functions.
A return value of 0 indicates success and -1 indicates failure.
Software: Andrew Tridgell <firstname.lastname@example.org> Man page: Rusty.
gdbm(3), tdb(3), tdb_lockall(3).
Linux Programmer's Manual Samba tdb_chainlock(Oct 13, 2000)