Readlock is used to perform read operations on a table with an access key or temporary index, locking the record read.
Readlock [ class ] [ key ] read_mode [ value_key ]
[ With lockwait = exp_times ]
# Read and lock loop for the first record in the
# table [CLI] as long as it is not unlocked.
Trbegin CLEINT [CLI]
Repeat : Readlock [CLI]CLE First With lockwait = 1 : Until fstat = 0
# Attempt to read and lock a record from the
# STK file until it is unlocked. CLE consists of
# a numerical element and an alphanumerical element.
Repeat Readlock [STK]CLE = [L]NUMPRO;[F:MAG]MAGAS Until fstat = 0
# ... continuation of routine
# Read and lock the last record in the sequence of the
# key CLE2 (a date element, an alphanumeric element, an integer element),
# for which there is a partial key less than the given values.
# The file read is the default file
Readlock CLE2(2) < [29/05/2019]; "JJ"