Go Package sync: Difference between revisions
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A <tt>WaitGroup</tt> is a counting semaphore that waits for a collection of goroutines to finish. The main goroutine calls <tt>Add()</tt> to set the number of goroutines to wait for. Then each of the goroutines runs and calls <tt>Done()</tt> when finished. At the same time, <tt>Wait()</tt> can be used to block until all goroutines have finished. | A <tt>WaitGroup</tt> is a counting semaphore that waits for a collection of goroutines to finish. The main goroutine calls <tt>Add()</tt> to set the number of goroutines to wait for. Then each of the goroutines runs and calls <tt>Done()</tt> when finished. At the same time, <tt>Wait()</tt> can be used to block until all goroutines have finished. | ||
<blockquote style="background-color: AliceBlue; border: solid thin LightSteelBlue;"> | |||
:Using</span> a <tt>waitGroup</tt> to wait for goroutines to finish before exiting <tt>main()</tt>: [https://github.com/NovaOrdis/playground/blob/master/go/concurrency/waitGroup.go playground/go/concurrency/waitGroup.go] | |||
</blockquote> | |||
Revision as of 03:53, 20 April 2016
External
Internal
Overview
The "sync" package provides synchronization primitives, to be used when synchronization between goroutines is needed.
Elements
WaitGroup
A WaitGroup is a counting semaphore that waits for a collection of goroutines to finish. The main goroutine calls Add() to set the number of goroutines to wait for. Then each of the goroutines runs and calls Done() when finished. At the same time, Wait() can be used to block until all goroutines have finished.
- Using a waitGroup to wait for goroutines to finish before exiting main(): playground/go/concurrency/waitGroup.go