Method unpin

basex-core/src/main/java/org/basex/core/locks/Locking.java:200–206

Unpins a lock string. Removes a lock if pin count is zero. @param string lock string @return lock

(final String string)

   * @return lock
   */
  private LocalReadWriteLock unpin(final String string) {
    synchronized(localLocks) {
      final LocalReadWriteLock lock = localLocks.get(string);
      if(lock.unpin()) localLocks.remove(string);
      return lock;
    }
  }

  /**
   * Returns query lock keys.