reclock_pseudo

open the master account file;
while (true) {
  get the operation type and information on the account
  switch (operation) { // user가 원하는 작업 세분화
    case create: // 새로운 record 생성
      get a writer’s lock on the record; // record 정보 update이므로 writer's lock 설정
      get id and name of the user; // user로부터 id와 name을 입력받음 (새로운 account 생성이므로 balance는 0)
      reset the account information; // account 정보 update
      release the writer’s lock; // writer's lock 해제
    case inquiry: // read balance
      get a reader’s’ lock on that record; // account 정보를 읽는 작업을 수행하므로 reader's lock 설정
      (if a write lock exists, blocked)
      display the account information; // account 정보 출력
      release the reader’s lock; // reader's lock 해제
    case deposit (or withdraw): // update balance
      get a writer’s lock on that record; // balance 값을 변경하므로 writer's lock 설정
      (if a writer’s or a reader’s lock exists, blocked)
      display the account information; // 변경된 account 정보 출력
      release the writer’s lock; // writer's lock 해제
}