iframe-proxy | Sunbelt Computer Software

42 lines (35 loc) · 615 Bytes

package extractor
type Unit struct{}
var unit = Unit{}
type semaphore struct {
	counter, lock chan Unit
func (s *semaphore) acquire(n int) {
	if s != nil {
		if cap(s.counter) < n {
			log.Fatalf("Tried to acquire more resources than were available.")
		s.lock <- unit
		for i := 0; i < n; i++ {
			s.counter <- unit
func (s *semaphore) release(n int) {
	if s != nil {
		for i := 0; i < n; i++ {
			<-s.counter
func newSemaphore(max int) *semaphore {
	if max > 0 {
		return &semaphore{make(chan Unit, max), make(chan Unit, 1)}
		return nil

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semaphore.go

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semaphore.go

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