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Use the full power of closure.

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Use the full power of closure by accepting the parameters to anonymous function being run by goroutine.
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Varun Narang 2021-12-31 23:31:35 +05:30 committed by GitHub
parent 668ecb9732
commit ccede75412
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1 changed files with 4 additions and 7 deletions
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11
examples/waitgroups/waitgroups.go
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@ -29,19 +29,16 @@ func main() {
// counter for each. // counter for each.
for i := 1; i <= 5; i++ { for i := 1; i <= 5; i++ {
wg.Add(1) wg.Add(1)
// Avoid re-use of the same `i` value in each goroutine closure.
// See [the FAQ](https://golang.org/doc/faq#closures_and_goroutines)
// for more details.
i := i
// Wrap the worker call in a closure that makes sure to tell // Wrap the worker call in a closure that makes sure to tell
// the WaitGroup that this worker is done. This way the worker // the WaitGroup that this worker is done. This way the worker
// itself does not have to be aware of the concurrency primitives // itself does not have to be aware of the concurrency primitives
// involved in its execution. // involved in its execution.
go func() { go func(i int) {
defer wg.Done() defer wg.Done()
worker(i) worker(i)
}() // use the incremental value of i in each different goroutine.
}(i)
} }
// Block until the WaitGroup counter goes back to 0; // Block until the WaitGroup counter goes back to 0;