tdb_chainlock(3)
lock a group of keys
SYNOPSIS
#include <tdb.h>
int tdb_chainlock(TDB_CONTEXT *tdb, TDB_DATA key);void tdb_chainunlock(TDB_CONTEXT *tdb, TDB_DATA key);
DESCRIPTION
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.
NOTES
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.
RETURN VALUE
A return value of 0 indicates success and -1 indicates failure.
