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| ☜ | timeout1977 Version of ANSI Standard | ☞ | ||||
The OPEN, LOCK, and READ commands employ an optional timeout specification, associated with the testing of an external condition.
| timeout | ::= | : numexpr |
See also the transition diagram for timeout.
If the optional timeout is absent, the command will proceed if the condition, associated with the definition of the command, is satisfied; otherwise, it will wait until the condition is satisfied and then proceed. $T will not be altered if the timeout is absent.
If the optional timeout is present, the value of numexpr must be nonnegative. If it is negative, the value 0 is used. numexpr denotes a t-second timeout, where t is the value of numexpr.
If t = 0, the condition is tested. If it is true, $T is set to 1; otherwise, $T is set to O. Execution proceeds without delay.
If t is positive, execution is suspended until the condition is true, but in any case no longer than t seconds. If at the time of resumption of execution the condition is true, $T is set to 1; otherwise, $T is set to 0.
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Copyright © Standard Documents; 1977-2024 MUMPS Development Committee;
Copyright © Examples: 1995-2024 Ed de Moel;
Copyright © Annotations: 2003-2008 Jacquard Systems Research
Copyright © Annotations: 2008-2024 Ed de Moel.
This page most recently updated on 28-Nov-2011, 21:33:04.
For comments, contact Ed de Moel (demoel@jacquardsystems.com)