logical (in wait)

In a wait statement, the logical keyword designates that conditions must remain true for a wait statement to become true.

Purpose

This keyword is used in the wait statement to test whether conditions become valid or remain true during a designated waiting period.

Context

Rule conditions

Syntax

(1) wait logical [[until] expression] [{condition}]; 
(2) ?variable
: wait [logical] [until] expression {condition}
              ... 
         then ... 
             timeout ?variable {action}

Description

In wait statements, use the keyword logical to indicate that the previously satisfied conditions must remain true for the wait statement to become true. If you do not use the logical keyword, all the previously satisfied conditions are ignored: they might become false during the waiting period and the wait statement might succeed.