Modern Chan Done

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Done

Subtracts one from the work outstanding; raises an error if it would go below zero.

Syntax

Done( )

Examples

#import "std/tasks"
using tasks

dim wg as WaitGroup
wg.Add( 2 )

wg.Done( )                   '' one unit of work finished
print wg.Count( )            '' 1

wg.Done( )
print wg.Count( )            '' 0 -- Wait( ) returns once the count reaches zero

'' In a worker this belongs in a DEFER, so an early exit still counts:
''     defer wg->Done( )
'' Calling Done( ) more times than Add( ) raises -- the count must not
'' go negative, because that would let Wait( ) return early forever.

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