/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file configFlags.I
 * @author drose
 * @date 2004-10-21
 */

/**
 * Returns true if the local object's cache is still valid (based on a
 * comparison of the supplied local_modified value with the global_modified
 * value).
 */
ALWAYS_INLINE bool ConfigFlags::
is_cache_valid(AtomicAdjust::Integer local_modified) {
  return local_modified == _global_modified;
}

/**
 * Updates the indicated local_modified value so that the cache will appear to
 * be valid, until someone next calls invalidate_cache().
 */
ALWAYS_INLINE void ConfigFlags::
mark_cache_valid(AtomicAdjust::Integer &local_modified) {
  local_modified = _global_modified;
}

/**
 * Returns a value that will be appropriate for initializing a local_modified
 * value.  This value will indicate an invalid cache in the next call to
 * is_cache_valid().
 */
INLINE AtomicAdjust::Integer ConfigFlags::
initial_invalid_cache() {
  return _global_modified - 1;
}

/**
 * Invalidates all of the global ConfigVariable caches in the world at once,
 * by incrementing the global_modified counter.
 */
INLINE void ConfigFlags::
invalidate_cache() {
  AtomicAdjust::inc(_global_modified);
}