Package waitgroup

Overview ▾

Package waitgroup defines an Analyzer that detects simple misuses of sync.WaitGroup.

Analyzer waitgroup

waitgroup: check for misuses of sync.WaitGroup

This analyzer detects mistaken calls to the (*sync.WaitGroup).Add method from inside a new goroutine, causing Add to race with Wait:

// WRONG
var wg sync.WaitGroup
go func() {
        wg.Add(1) // "WaitGroup.Add called from inside new goroutine"
        defer wg.Done()
        ...
}()
wg.Wait() // (may return prematurely before new goroutine starts)

The correct code calls Add before starting the goroutine:

// RIGHT
var wg sync.WaitGroup
wg.Add(1)
go func() {
	defer wg.Done()
	...
}()
wg.Wait()

Package waitgroup defines an Analyzer that detects simple misuses of sync.WaitGroup.

Index ▾

Package files

doc.go waitgroup.go