Method WriteLock

chapter7/patterns/semaphore/semaphore.go:234–240

WriteLock blocks all reading so the write can happen safely.

()

// WriteLock blocks all reading so the write can happen safely.
func (rw *readerWriter) WriteLock() {
	// Add 1 to the waitGroup so reads will block
	rw.write.Add(1)

	// Acquire all the buffers from the semaphore channel.
	rw.readerControl.Acquire(rw.maxReads)
}

// WriteUnlock releases the write lock and allows reads to occur.
func (rw *readerWriter) WriteUnlock() {