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package analyze
import "sync"
// A WaitGroup waits for a collection of goroutines to finish.
// In contrast to sync.WaitGroup Add method can be called from a goroutine.
type WaitGroup struct {
wait sync.Mutex
value int
access sync.Mutex
}
// Init prepares the WaitGroup for usage, locks
func (s *WaitGroup) Init() *WaitGroup {
s.wait.Lock()
return s
}
// Add increments value
func (s *WaitGroup) Add(value int) {
s.access.Lock()
s.value += value
s.access.Unlock()
}
// Done decrements the value by one, if value is 0, lock is released
func (s *WaitGroup) Done() {
s.access.Lock()
s.value--
s.check()
s.access.Unlock()
}
// Wait blocks until value is 0
func (s *WaitGroup) Wait() {
s.access.Lock()
isValue := s.value > 0
s.access.Unlock()
if isValue {
s.wait.Lock()
}
}
func (s *WaitGroup) check() {
if s.value == 0 {
s.wait.TryLock()
s.wait.Unlock()
}
}
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