IB Statements/unlock
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(New page: '''UNLOCK statement''' '''Syntax:''' UNLOCK (lun) [,EXCP=statement-label] '''Discussion:''' The UNLOCK statement removes the restriction of a previous LOCK on a file. It is issued o...) |
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| - | '''Syntax:''' UNLOCK (lun) [,EXCP=statement-label] | + | '''Syntax:''' UNLOCK (lun) [,EXCP=statement-label | NOEXCP] |
'''Discussion:''' The UNLOCK statement removes the restriction of a previous LOCK on a file. It is issued on a lun which has been previously opened by the user. If a file is successfully locked, any other user will get an exception 7 on an attempted open, until the file is unlocked by the locking user. | '''Discussion:''' The UNLOCK statement removes the restriction of a previous LOCK on a file. It is issued on a lun which has been previously opened by the user. If a file is successfully locked, any other user will get an exception 7 on an attempted open, until the file is unlocked by the locking user. | ||
Latest revision as of 22:13, 28 May 2009
UNLOCK statement
Syntax: UNLOCK (lun) [,EXCP=statement-label | NOEXCP]
Discussion: The UNLOCK statement removes the restriction of a previous LOCK on a file. It is issued on a lun which has been previously opened by the user. If a file is successfully locked, any other user will get an exception 7 on an attempted open, until the file is unlocked by the locking user.
Example: OPEN (1) "FILEB"
LOCK (1)
.
.
UNLOCK (1)
CLOSE (1)
This example shows several related file statements. First, a data file is opened and locked. Later in the program, the file is unlocked and closed.
