Modern Chan WaitFor

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WaitFor

Waits at most ms milliseconds for the work to reach zero; returns false on a timeout.

Syntax

WaitFor( ms )

Examples

#import "std/tasks"
using tasks

dim wg as WaitGroup

'' The bounded form: TRUE if the count reached zero, FALSE on timeout
print wg.WaitFor( 100 )      '' true -- nothing outstanding

wg.Add( )
print wg.WaitFor( 50 )       '' false -- still one outstanding after 50ms

'' ms = 0 IS A POLL, not an infinite wait -- the same rule as
'' Channel.SendFor( v, 0 ). Wait( ) is how "forever" is spelled.
print wg.WaitFor( 0 )        '' false, and it returns at once

'' A FALSE does not cancel anything and does not consume the work. It
'' is the whole reason the design has no forced termination: a caller
'' that gives up still has to decide what to do about the worker.
wg.Done( )
print wg.WaitFor( 0 )        '' true

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Library: Goroutines and Channels
Category: Goroutines and Channels
Documented under: Waitgroup