Language Elements
37
NetLinx Programming Language Reference Guide
Nesting Waits
The wait time for a nested wait is the sum of it's own wait time, plus that of the enclosing waits. In the
example below,
SECOND WAIT occurs 0.5 seconds after FIRST WAIT is executed, or 1.5 seconds after
FIRST WAIT is added to the wait list.
WAIT 10 'FIRST WAIT'
{
(* FIRST WAIT statements *)
WAIT 5 'SECOND WAIT'
{
(* SECOND WAIT statements *)
}
}
To execute the inner wait of a nested conditional wait, the conditions must be met in the order specified
(condition 1, then condition 2) but not necessarily at the same time.
Types of Waits (Cont.)
Conditional Waits WAIT_UNTIL is a conditional Wait request.
Syntax:
WAIT_UNTIL <condition> ['<name>']
{
(* wait statements *)
}
Parameters:
• <condition>: Any single or compound expression that can be evaluated as
a logical expression. The Wait statements are executed if and when the wait
condition becomes True.
• <name>: The name to assign to the Wait. This name must be a literal string.
The Wait name is optional, although unless a Wait is named it cannot be
individually cancelled, paused, or restarted.
Timed Conditional Waits TIMED_WAIT_UNTIL is a Timed Conditional Wait request.
Syntax:
TIMED_WAIT_UNTIL <condition> timeout ['<name>']
{
(* wait statements *)
}
Parameters:
• <condition>: Any single or compound expression that can be evaluated as
a logical expression. The Wait statements are executed if and when the Wait
condition becomes true.
• timeout: A constant or variable indicating the timeout value in 1/10th
seconds. If the Wait condition is not met within the time indicated by this
parameter, the Wait is cancelled, in which case no wait statements are
executed.
• <name>: The name to assign to the Wait. This name must be a literal string.
The Wait name is optional, although unless a Wait is named it cannot be
individually cancelled, paused, or restarted.
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