Function adjustReadLock

packages/effect/src/internal/stm/tReentrantLock.ts:142–154

(readLock: ReadLock, fiberId: FiberId.FiberId, adjustment: number)

 * Adjusts the number of read locks held by the specified fiber id.
 */
const adjustReadLock = (readLock: ReadLock, fiberId: FiberId.FiberId, adjustment: number): ReadLock => {
  const total = readLock.readLocksHeld(fiberId)
  const newTotal = total + adjustment
  if (newTotal < 0) {
    throw new Error(
      "BUG - TReentrantLock.ReadLock.adjust - please report an issue at https://github.com/Effect-TS/effect/issues"
    )
  }
  if (newTotal === 0) {
    return new ReadLock(HashMap.remove(readLock.readers, fiberId))
  }
  return new ReadLock(HashMap.set(readLock.readers, fiberId, newTotal))
}

const adjustRead = (self: TReentrantLock.TReentrantLock, delta: number): STM.STM<number> =>
  core.withSTMRuntime((runtime) => {