Method ReadLock

chapter7/patterns/semaphore/semaphore.go:219–225

ReadLock guarantees only the maximum number of goroutines can read at a time.

(reader int)

// ReadLock guarantees only the maximum number of goroutines can read at a time.
func (rw *readerWriter) ReadLock(reader int) {
	// If a write is occurring, wait for it to complete.
	rw.write.Wait()

	// Acquire a buffer from the semaphore channel.
	rw.readerControl.Acquire(1)
}

// ReadUnlock gives other goroutines waiting to read their opporunity.
func (rw *readerWriter) ReadUnlock(reader int) {