Class: TimedPromise

• Inheritance
• Description
• Class protocol
  • instance creation
• Instance protocol
  • accessing
  • accessing-parent
  • private
• Examples

Inheritance:

   Object
   |
   +--Promise
      |
      +--TimedPromise

Package:

stx:libbasic2

Category:

Kernel-Processes

Version:

rev: 1.5 date: 2021/01/20 14:31:49

user: cg

file: TimedPromise.st directory: libbasic2

module: stx stc-classLibrary: libbasic2

Description:

A TimedPromise is a Promise with a timeout.
An attempt to read the value of a TimedPromise will wait until the process has finished computing it 
or the specified timeout expires.  
If the process terminates with an exception, an attempt to read the value of the TimedPromise will raise the same exception. 
In case of a timeout the OsNeedRetryError will be raised.

copyright
COPYRIGHT (c) 2004 by eXept Software AG
             All Rights Reserved

This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice.   This software may not
be provided or otherwise made available to, or used by, any
other person.  No title to or ownership of the software is
hereby transferred.

Class protocol:

 forMilliseconds: ms

Instance protocol:

 ms: msec

 value

Note -- only good for one waiter

 startup

Wait for data arrival or alarm expiry.

Examples:

     |p|

     p := TimedPromise forMilliseconds:1000.
     p value:[10000 factorial] priority:Processor activePriority.

     Transcript showCR:'doing something else'.
     p value   

     |p|

     p := TimedPromise forMilliseconds:1000.
     p value:[1000 factorial] priority:Processor activePriority.

     Transcript showCR:'doing something else'.
     p value   

     |p|

     p := TimedPromise forMilliseconds:1000.
     p value:[1000 factorial. ZeroDivide raise] priority:Processor activePriority.

     Transcript showCR:'doing something else'.
     p value