205 lines
6.9 KiB
Plaintext
205 lines
6.9 KiB
Plaintext
// Filename: simpleLru.I
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// Created by: drose (11May07)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLru::get_total_size
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// Access: Published
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// Description: Returns the total size of all objects currently
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// active on the LRU.
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////////////////////////////////////////////////////////////////////
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INLINE size_t SimpleLru::
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get_total_size() const {
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MutexHolder holder(_global_lock);
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return _total_size;
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLru::get_max_size
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// Access: Published
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// Description: Returns the max size of all objects that are allowed
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// to be active on the LRU.
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////////////////////////////////////////////////////////////////////
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INLINE size_t SimpleLru::
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get_max_size() const {
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MutexHolder holder(_global_lock);
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return _max_size;
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLru::set_max_size
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// Access: Published
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// Description: Changes the max size of all objects that are allowed
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// to be active on the LRU.
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//
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// If the size is (size_t)-1, there is no limit.
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////////////////////////////////////////////////////////////////////
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INLINE void SimpleLru::
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set_max_size(size_t max_size) {
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MutexHolder holder(_global_lock);
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_max_size = max_size;
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if (_total_size > _max_size) {
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do_evict();
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLru::consider_evict
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// Access: Published
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// Description: Evicts a sequence of objects if the queue is full.
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////////////////////////////////////////////////////////////////////
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INLINE void SimpleLru::
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consider_evict() {
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MutexHolder holder(_global_lock);
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if (_total_size > _max_size) {
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do_evict();
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLru::begin_epoch
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// Access: Published
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// Description: Marks the end of the previous epoch and the beginning
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// of the next one. This will evict any objects that
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// are pending eviction, and also update any internal
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// bookkeeping.
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////////////////////////////////////////////////////////////////////
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INLINE void SimpleLru::
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begin_epoch() {
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consider_evict();
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_active_marker->enqueue_lru(this);
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLruPage::Constructor
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// Access: Protected
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// Description:
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////////////////////////////////////////////////////////////////////
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INLINE SimpleLruPage::
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SimpleLruPage(size_t lru_size) :
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_lru(NULL),
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_lru_size(lru_size)
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{
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLruPage::Copy Constructor
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// Access: Protected
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// Description:
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////////////////////////////////////////////////////////////////////
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INLINE SimpleLruPage::
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SimpleLruPage(const SimpleLruPage ©) :
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_lru(NULL),
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_lru_size(copy._lru_size)
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{
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLruPage::Copy Assignment Operator
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// Access: Protected
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// Description:
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////////////////////////////////////////////////////////////////////
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INLINE void SimpleLruPage::
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operator = (const SimpleLruPage ©) {
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set_lru_size(copy.get_lru_size());
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLruPage::enqueue_lru
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// Access: Published
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// Description: Returns the LRU that manages this page, or NULL if it
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// is not currently managed by any LRU.
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////////////////////////////////////////////////////////////////////
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INLINE SimpleLru *SimpleLruPage::
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get_lru() const {
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MutexHolder holder(SimpleLru::_global_lock);
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return _lru;
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLruPage::dequeue_lru
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// Access: Published
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// Description: Removes the page from its SimpleLru.
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////////////////////////////////////////////////////////////////////
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INLINE void SimpleLruPage::
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dequeue_lru() {
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MutexHolder holder(SimpleLru::_global_lock);
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if (_lru != (SimpleLru *)NULL) {
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remove_from_list();
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_lru->_total_size -= _lru_size;
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_lru = NULL;
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLruPage::mark_used_lru
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// Access: Published
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// Description: To be called when the page is used; this will move it
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// to the tail of the SimpleLru queue it is already on.
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//
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// This method is const because it's not technically
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// modifying the contents of the page itself.
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////////////////////////////////////////////////////////////////////
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INLINE void SimpleLruPage::
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mark_used_lru() const {
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if (_lru != (SimpleLru *)NULL) {
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((SimpleLruPage *)this)->mark_used_lru(_lru);
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLruPage::mark_used_lru
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// Access: Published
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// Description: To be called when the page is used; this will move it
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// to the tail of the specified SimpleLru queue.
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////////////////////////////////////////////////////////////////////
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INLINE void SimpleLruPage::
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mark_used_lru(SimpleLru *lru) {
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enqueue_lru(lru);
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLruPage::get_lru_size
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// Access: Published
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// Description: Returns the size of this page as reported to the LRU,
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// presumably in bytes.
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////////////////////////////////////////////////////////////////////
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INLINE size_t SimpleLruPage::
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get_lru_size() const {
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return _lru_size;
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}
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////////////////////////////////////////////////////////////////////
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// Function: SimpleLruPage::set_lru_size
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// Access: Published
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// Description: Specifies the size of this page, presumably in bytes,
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// although any unit is possible.
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////////////////////////////////////////////////////////////////////
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INLINE void SimpleLruPage::
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set_lru_size(size_t lru_size) {
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MutexHolder holder(SimpleLru::_global_lock);
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if (_lru != (SimpleLru *)NULL) {
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_lru->_total_size -= _lru_size;
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_lru->_total_size += lru_size;
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_lru_size = lru_size;
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} else {
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_lru_size = lru_size;
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}
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}
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