Difference between revisions of "SET PCLOCKING"

Revision as of 09:46, 17 April 2009

Class

Xbase Compatibility

Purpose

Determine whether multiple locks may be applied

Syntax

SET PCLOCKING ON | OFF | (<expL>)

See Also

ACCESS(), APPEND, CHANGE, DB_FOXPLUSBUGS, DB_FOXPROKEYS, DB_SAMBA, EDIT, EDITFIELD(), FILETYPE(), FLOCK(), INDEXEXT(), LOCK(), LOCKF, LOCKR, RLOCK(), SET CLIPPER, SET CLIPPER5, SET COMPATIBLE, SET EDITFIELD, SET EXCLUSIVE, SET FILECASE, SET FILETYPE, SET FORMAT, SET INDEXEXT, SET LOCKWAIT, SET MEMOEXT, SET PCEDIT, SET PCEXACT, SET PCFILTER, SET PCGRAPHICS, SET PCKEYS, SET PCPICTURE, SET PCSAYS, SET PCUNIQUE, UNLOCK, USE

Description

The SET PCLOCKING command determines whether multiple locks may be applied to records or the currently active table. If PCLOCKING is set ON, previous locks will be canceled as FLOCK() or RLOCK() functions attempt to lock records or files that are all ready locked. The previous lock will be removed regardless of the success or failure of the FLOCK() or RLOCK() function. When PCLOCKING is set OFF, multiple applications of the FLOCK() and RLOCK() functions are allowed. Please note that file and record locking is performed automatically. In most situations, the SET PCLOCKING command and the RLOCK() and FLOCK() functions are unnecessary, and are included for compatibility with programs written in other products.

This command allows the optional logical expression <expL> to be evaluated. If a value of .T. is returned, PCLOCKING is set ON. If a value of .F. is returned PCLOCKING is set OFF. Note that the <expL> should be enclosed in round brackets. By default, PCLOCKING is OFF.

Example

set pclocking on
do while not rlock()
    set message to "Record in use."
    sleep 2
enddo

Products

Recital Database Server, Recital Mirage Server, Recital Terminal Developer