Function makeReadLock

packages/effect/src/internal/stm/tReentrantLock.ts:121–126

(fiberId: FiberId.FiberId, count: number)

 * number of read locks.
 */
const makeReadLock = (fiberId: FiberId.FiberId, count: number): ReadLock => {
  if (count <= 0) {
    return emptyReadLock
  }
  return new ReadLock(HashMap.make([fiberId, count]))
}

/**
 * Determines if there is no other holder of read locks aside from the