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waitgroup.go
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waitgroup.go
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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2022, Unikraft GmbH and The KraftKit Authors.
// Licensed under the BSD-3-Clause License (the "License").
// You may not use this file except in compliance with the License.
package waitgroup
import "sync"
type WaitGroup[T comparable] struct {
mu sync.RWMutex
li []T
}
// Add to the wait group.
func (wg *WaitGroup[T]) Add(k T) {
wg.mu.Lock()
defer wg.mu.Unlock()
if wg.Contains(k) {
return
}
wg.li = append(wg.li, k)
}
// Done signals that the provided entity can be removed from the wait group.
func (wg *WaitGroup[T]) Done(needle T) {
wg.mu.Lock()
defer wg.mu.Unlock()
if !wg.Contains(needle) {
return
}
for i, k := range wg.li {
if k == needle {
wg.li = append(wg.li[:i], wg.li[i+1:]...)
return
}
}
}
// Wait for all items in the wait group to be removed.
func (wg *WaitGroup[T]) Wait() {
for {
if len(wg.li) == 0 {
break
}
}
}
// Contains checks if the provided entity is still in the wait group.
func (wg *WaitGroup[T]) Contains(needle T) bool {
for _, mid := range wg.li {
if mid == needle {
return true
}
}
return false
}
// Items returns the list of items in the wait group.
func (wg *WaitGroup[T]) Items() []T {
return wg.li
}