mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-26 20:30:10 +01:00
50 lines
1.2 KiB
Go
50 lines
1.2 KiB
Go
package syncwg
|
|
|
|
import (
|
|
"sync"
|
|
)
|
|
|
|
// WaitGroup wraps sync.WaitGroup and makes safe to call Add/Wait
|
|
// from concurrent goroutines.
|
|
//
|
|
// An additional limitation is that call to Wait prohibits further calls to Add
|
|
// until return.
|
|
type WaitGroup struct {
|
|
sync.WaitGroup
|
|
mu sync.Mutex
|
|
}
|
|
|
|
// Add registers n additional workers. Add may be called from concurrent goroutines.
|
|
func (wg *WaitGroup) Add(n int) {
|
|
wg.mu.Lock()
|
|
wg.WaitGroup.Add(n)
|
|
wg.mu.Unlock()
|
|
}
|
|
|
|
// Wait waits until all the goroutines call Done.
|
|
//
|
|
// Wait may be called from concurrent goroutines.
|
|
//
|
|
// Further calls to Add are blocked until return from Wait.
|
|
func (wg *WaitGroup) Wait() {
|
|
wg.mu.Lock()
|
|
wg.WaitGroup.Wait()
|
|
wg.mu.Unlock()
|
|
}
|
|
|
|
// WaitAndBlock waits until all the goroutines call Done and then prevents
|
|
// from new goroutines calling Add.
|
|
//
|
|
// Further calls to Add are always blocked. This is useful for graceful shutdown
|
|
// when other goroutines calling Add must be stopped.
|
|
//
|
|
// wg cannot be used after this call.
|
|
func (wg *WaitGroup) WaitAndBlock() {
|
|
wg.mu.Lock()
|
|
wg.WaitGroup.Wait()
|
|
|
|
// Do not unlock wg.mu, so other goroutines calling Add are blocked.
|
|
}
|
|
|
|
// There is no need in wrapping WaitGroup.Done, since it is already goroutine-safe.
|